// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

#nullable disable

using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Windows.Forms.TestUtilities;
using Moq;
using Windows.Win32.System.Com;
using Windows.Win32.System.Ole;
using Windows.Win32.System.Variant;
using Point = System.Drawing.Point;
using Size = System.Drawing.Size;

namespace System.Windows.Forms.Tests;

[Collection("Sequential")] // workaround for WebBrowser control corrupting memory when run on multiple UI threads (instantiated via GUID)
public class AxHostTests
{
    private const string EmptyClsidString = "00000000-0000-0000-0000-000000000000";
    private const string WebBrowserClsidString = "8856f961-340a-11d0-a96b-00c04fd705a2";

    [WinFormsTheory]
    [InlineData(EmptyClsidString)]
    public void AxHost_Ctor_String(string clsid)
    {
        using SubAxHost control = new(clsid);
        Assert.Null(control.AccessibleDefaultActionDescription);
        Assert.Null(control.AccessibleDescription);
        Assert.Null(control.AccessibleName);
        Assert.Equal(AccessibleRole.Default, control.AccessibleRole);
        Assert.False(control.AllowDrop);
        Assert.Equal(AnchorStyles.Top | AnchorStyles.Left, control.Anchor);
        Assert.False(control.AutoSize);
        Assert.Equal(Control.DefaultBackColor, control.BackColor);
        Assert.Null(control.BackgroundImage);
        Assert.Equal(ImageLayout.Tile, control.BackgroundImageLayout);
        Assert.Null(control.BindingContext);
        Assert.Equal(23, control.Bottom);
        Assert.Equal(new Rectangle(0, 0, 75, 23), control.Bounds);
        Assert.True(control.CanEnableIme);
        Assert.False(control.CanFocus);
        Assert.True(control.CanRaiseEvents);
        Assert.False(control.CanSelect);
        Assert.False(control.Capture);
        Assert.True(control.CausesValidation);
        Assert.Equal(new Size(75, 23), control.ClientSize);
        Assert.Equal(new Rectangle(0, 0, 75, 23), control.ClientRectangle);
        Assert.Null(control.Container);
        Assert.Null(control.ContainingControl);
        Assert.False(control.ContainsFocus);
        Assert.Null(control.ContextMenuStrip);
        Assert.Empty(control.Controls);
        Assert.Same(control.Controls, control.Controls);
        Assert.False(control.Created);
        Assert.Same(Cursors.Default, control.Cursor);
        Assert.Same(Cursors.Default, control.DefaultCursor);
        Assert.Equal(ImeMode.Inherit, control.DefaultImeMode);
        Assert.Equal(new Padding(3), control.DefaultMargin);
        Assert.Equal(Size.Empty, control.DefaultMaximumSize);
        Assert.Equal(Size.Empty, control.DefaultMinimumSize);
        Assert.Equal(Padding.Empty, control.DefaultPadding);
        Assert.Equal(new Size(75, 23), control.DefaultSize);
        Assert.False(control.DesignMode);
        Assert.Equal(new Rectangle(0, 0, 75, 23), control.DisplayRectangle);
        Assert.Equal(DockStyle.None, control.Dock);
        Assert.False(control.DoubleBuffered);
        Assert.False(control.EditMode);
        Assert.True(control.Enabled);
        Assert.NotNull(control.Events);
        Assert.Same(control.Events, control.Events);
        Assert.False(control.Focused);
        Assert.Equal(Control.DefaultFont, control.Font);
        Assert.Equal(control.Font.Height, control.FontHeight);
        Assert.Equal(Control.DefaultForeColor, control.ForeColor);
        Assert.False(control.HasAboutBox);
        Assert.False(control.HasChildren);
        Assert.Equal(23, control.Height);
        Assert.Equal(ImeMode.NoControl, control.ImeMode);
        Assert.Equal(ImeMode.NoControl, control.ImeModeBase);
        Assert.False(control.IsAccessible);
        Assert.False(control.IsMirrored);
        Assert.NotNull(control.LayoutEngine);
        Assert.Same(control.LayoutEngine, control.LayoutEngine);
        Assert.Equal(0, control.Left);
        Assert.Equal(Point.Empty, control.Location);
        Assert.Equal(new Padding(3), control.Margin);
        Assert.Equal(Size.Empty, control.MaximumSize);
        Assert.Equal(Size.Empty, control.MinimumSize);
        Assert.Null(control.OcxState);
        Assert.Equal(Padding.Empty, control.Padding);
        Assert.Null(control.Parent);
        Assert.Equal(new Size(75, 23), control.PreferredSize);
        Assert.Equal("Microsoft\u00AE .NET", control.ProductName);
        Assert.False(control.RecreatingHandle);
        Assert.Null(control.Region);
        Assert.False(control.ResizeRedraw);
        Assert.Equal(75, control.Right);
        Assert.False(control.RightToLeft);
        Assert.Equal(RightToLeft.No, ((Control)control).RightToLeft);
        Assert.True(control.ShowFocusCues);
        Assert.True(control.ShowKeyboardCues);
        Assert.Null(control.Site);
        Assert.Equal(new Size(75, 23), control.Size);
        Assert.Equal(0, control.TabIndex);
        Assert.True(control.TabStop);
        Assert.Empty(control.Text);
        Assert.Equal(0, control.Top);
        Assert.Null(control.TopLevelControl);
        Assert.False(control.UseWaitCursor);
        Assert.True(control.Visible);
        Assert.Equal(75, control.Width);

        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [InlineData(EmptyClsidString, 0)]
    public void AxHost_Ctor_String_Int(string clsid, int flags)
    {
        using SubAxHost control = new(clsid, flags);
        Assert.Null(control.AccessibleDefaultActionDescription);
        Assert.Null(control.AccessibleDescription);
        Assert.Null(control.AccessibleName);
        Assert.Equal(AccessibleRole.Default, control.AccessibleRole);
        Assert.False(control.AllowDrop);
        Assert.Equal(AnchorStyles.Top | AnchorStyles.Left, control.Anchor);
        Assert.False(control.AutoSize);
        Assert.Equal(Control.DefaultBackColor, control.BackColor);
        Assert.Null(control.BackgroundImage);
        Assert.Equal(ImageLayout.Tile, control.BackgroundImageLayout);
        Assert.Null(control.BindingContext);
        Assert.Equal(23, control.Bottom);
        Assert.Equal(new Rectangle(0, 0, 75, 23), control.Bounds);
        Assert.True(control.CanEnableIme);
        Assert.False(control.CanFocus);
        Assert.True(control.CanRaiseEvents);
        Assert.False(control.CanSelect);
        Assert.False(control.Capture);
        Assert.True(control.CausesValidation);
        Assert.Equal(new Size(75, 23), control.ClientSize);
        Assert.Equal(new Rectangle(0, 0, 75, 23), control.ClientRectangle);
        Assert.Null(control.Container);
        Assert.Null(control.ContainingControl);
        Assert.False(control.ContainsFocus);
        Assert.Null(control.ContextMenuStrip);
        Assert.Empty(control.Controls);
        Assert.Same(control.Controls, control.Controls);
        Assert.False(control.Created);
        Assert.Same(Cursors.Default, control.Cursor);
        Assert.Same(Cursors.Default, control.DefaultCursor);
        Assert.Equal(ImeMode.Inherit, control.DefaultImeMode);
        Assert.Equal(new Padding(3), control.DefaultMargin);
        Assert.Equal(Size.Empty, control.DefaultMaximumSize);
        Assert.Equal(Size.Empty, control.DefaultMinimumSize);
        Assert.Equal(Padding.Empty, control.DefaultPadding);
        Assert.Equal(new Size(75, 23), control.DefaultSize);
        Assert.False(control.DesignMode);
        Assert.Equal(new Rectangle(0, 0, 75, 23), control.DisplayRectangle);
        Assert.Equal(DockStyle.None, control.Dock);
        Assert.False(control.DoubleBuffered);
        Assert.False(control.EditMode);
        Assert.True(control.Enabled);
        Assert.NotNull(control.Events);
        Assert.Same(control.Events, control.Events);
        Assert.False(control.Focused);
        Assert.Equal(Control.DefaultFont, control.Font);
        Assert.Equal(control.Font.Height, control.FontHeight);
        Assert.Equal(Control.DefaultForeColor, control.ForeColor);
        Assert.False(control.HasAboutBox);
        Assert.False(control.HasChildren);
        Assert.Equal(23, control.Height);
        Assert.Equal(ImeMode.NoControl, control.ImeMode);
        Assert.Equal(ImeMode.NoControl, control.ImeModeBase);
        Assert.False(control.IsAccessible);
        Assert.False(control.IsMirrored);
        Assert.NotNull(control.LayoutEngine);
        Assert.Same(control.LayoutEngine, control.LayoutEngine);
        Assert.Equal(0, control.Left);
        Assert.Equal(Point.Empty, control.Location);
        Assert.Equal(new Padding(3), control.Margin);
        Assert.Equal(Size.Empty, control.MaximumSize);
        Assert.Equal(Size.Empty, control.MinimumSize);
        Assert.Null(control.OcxState);
        Assert.Equal(Padding.Empty, control.Padding);
        Assert.Null(control.Parent);
        Assert.Equal(new Size(75, 23), control.PreferredSize);
        Assert.Equal("Microsoft\u00AE .NET", control.ProductName);
        Assert.False(control.RecreatingHandle);
        Assert.Null(control.Region);
        Assert.False(control.ResizeRedraw);
        Assert.Equal(75, control.Right);
        Assert.False(control.RightToLeft);
        Assert.Equal(RightToLeft.No, ((Control)control).RightToLeft);
        Assert.True(control.ShowFocusCues);
        Assert.True(control.ShowKeyboardCues);
        Assert.Null(control.Site);
        Assert.Equal(new Size(75, 23), control.Size);
        Assert.Equal(0, control.TabIndex);
        Assert.True(control.TabStop);
        Assert.Empty(control.Text);
        Assert.Equal(0, control.Top);
        Assert.Null(control.TopLevelControl);
        Assert.False(control.UseWaitCursor);
        Assert.True(control.Visible);
        Assert.Equal(75, control.Width);

        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void AxHost_Ctor_NullClsid_ThrowsArgumentNullException()
    {
        Assert.Throws<ArgumentNullException>("g", () => new SubAxHost(null));
        Assert.Throws<ArgumentNullException>("g", () => new SubAxHost(null, 0));
    }

    [WinFormsTheory]
    [InlineData("")]
    [InlineData("clsid")]
    public void AxHost_Ctor_EmptyClsid_ThrowsFormatException(string clsid)
    {
        Assert.Throws<FormatException>(() => new SubAxHost(clsid));
    }

    [WinFormsFact]
    public void AxHost_CreateParams_GetDefault_ReturnsExpected()
    {
        using SubAxHost control = new(EmptyClsidString);
        CreateParams createParams = control.CreateParams;
        Assert.Null(createParams.Caption);
        Assert.Null(createParams.ClassName);
        Assert.Equal(0x8, createParams.ClassStyle);
        Assert.Equal(0, createParams.ExStyle);
        Assert.Equal(23, createParams.Height);
        Assert.Equal(IntPtr.Zero, createParams.Parent);
        Assert.Null(createParams.Param);
        Assert.Equal(0x56010000, createParams.Style);
        Assert.Equal(75, createParams.Width);
        Assert.Equal(0, createParams.X);
        Assert.Equal(0, createParams.Y);
        Assert.Same(createParams, control.CreateParams);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void AxHost_CreateParams_GetWithSite_ReturnsExpected()
    {
        Mock<ISite> mockSite = new(MockBehavior.Strict);
        mockSite
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite
            .Setup(s => s.DesignMode)
            .Returns(true);
        using SubAxHost control = new(WebBrowserClsidString)
        {
            Site = mockSite.Object
        };

        CreateParams createParams = control.CreateParams;
        Assert.Null(createParams.Caption);
        Assert.Null(createParams.ClassName);
        Assert.Equal(0x8, createParams.ClassStyle);
        Assert.Equal(0, createParams.ExStyle);
        Assert.Equal(23, createParams.Height);
        Assert.Equal(IntPtr.Zero, createParams.Parent);
        Assert.Null(createParams.Param);
        Assert.Equal(0x56010000, createParams.Style);
        Assert.Equal(75, createParams.Width);
        Assert.Equal(0, createParams.X);
        Assert.Equal(0, createParams.Y);
        Assert.Same(createParams, control.CreateParams);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [CommonMemberData(typeof(CommonTestHelperEx), nameof(CommonTestHelperEx.GetBackColorTheoryData))]
    public void AxHost_BackColor_Set_GetReturnsExpected(Color value, Color expected)
    {
        using SubAxHost control = new(EmptyClsidString)
        {
            BackColor = value
        };
        Assert.Equal(expected, control.BackColor);

        // Set same.
        control.BackColor = value;
        Assert.Equal(expected, control.BackColor);
    }

    [WinFormsTheory]
    [CommonMemberData(typeof(CommonTestHelperEx), nameof(CommonTestHelperEx.GetImageTheoryData))]
    public void AxHost_BackgroundImage_Set_GetReturnsExpected(Image value)
    {
        using SubAxHost control = new(EmptyClsidString)
        {
            BackgroundImage = value
        };
        Assert.Same(value, control.BackgroundImage);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.BackgroundImage = value;
        Assert.Same(value, control.BackgroundImage);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [EnumData<ImageLayout>]
    public void AxHost_BackgroundImageLayout_Set_GetReturnsExpected(ImageLayout value)
    {
        using SubAxHost control = new(EmptyClsidString)
        {
            BackgroundImageLayout = value
        };
        Assert.Equal(value, control.BackgroundImageLayout);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.BackgroundImageLayout = value;
        Assert.Equal(value, control.BackgroundImageLayout);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [InvalidEnumData<ImageLayout>]
    public void AxHost_BackgroundImageLayout_SetInvalid_ThrowsInvalidEnumArgumentException(ImageLayout value)
    {
        using SubAxHost control = new(EmptyClsidString);
        Assert.Throws<InvalidEnumArgumentException>("value", () => control.BackgroundImageLayout = value);
    }

    [WinFormsFact]
    public static void AxHost_ContainingControl_GetWithContainerControlGrandparent_ReturnsExpected()
    {
        ContainerControl grandparent = new();
        Control parent = new()
        {
            Parent = grandparent
        };
        using SubAxHost control = new(EmptyClsidString)
        {
            Parent = parent
        };
        Assert.Same(grandparent, control.ContainingControl);

        // Call again to check caching.
        Assert.Same(control.ContainingControl, control.ContainingControl);

        // Remove from chain.
        parent.Parent = null;
        Assert.Same(grandparent, control.ContainingControl);
    }

    [WinFormsFact]
    public static void AxHost_ContainingControl_GetWithContainerControlParent_ReturnsExpected()
    {
        ContainerControl parent = new();
        using SubAxHost control = new(EmptyClsidString)
        {
            Parent = parent
        };
        Assert.Same(parent, control.ContainingControl);

        // Call again to check caching.
        Assert.Same(parent, control.ContainingControl);

        // Remove from chain.
        control.Parent = null;
        Assert.Same(parent, control.ContainingControl);
    }

    [WinFormsFact]
    public static void AxHost_ContainingControl_GetWithNonContainerControlParent_ReturnsExpected()
    {
        Control parent = new();
        using SubAxHost control = new(EmptyClsidString)
        {
            Parent = parent
        };
        Assert.Null(control.ContainingControl);

        // Call again to check caching.
        Assert.Null(control.ContainingControl);

        // Modify.
        ContainerControl grandparent = new();
        parent.Parent = grandparent;
        Assert.Same(grandparent, control.ContainingControl);

        // Call again to check caching.
        Assert.Same(grandparent, control.ContainingControl);

        // Remove from chain.
        parent.Parent = null;
        Assert.Same(grandparent, control.ContainingControl);
    }

    public static IEnumerable<object[]> ContainingControl_Set_TestData()
    {
        yield return new object[] { null };
        yield return new object[] { new ContainerControl() };
    }

    [WinFormsTheory]
    [MemberData(nameof(ContainingControl_Set_TestData))]
    public void AxHost_ContainingControl_Set_GetReturnsExpected(ContainerControl value)
    {
        using SubAxHost control = new(EmptyClsidString)
        {
            ContainingControl = value
        };
        Assert.Same(value, control.ContainingControl);

        // Set same.
        control.ContainingControl = value;
        Assert.Same(value, control.ContainingControl);
    }

    [WinFormsTheory]
    [CommonMemberData(typeof(CommonTestHelperEx), nameof(CommonTestHelperEx.GetCursorTheoryData))]
    public void AxHost_Cursor_Set_GetReturnsExpected(Cursor value)
    {
        using SubAxHost control = new(EmptyClsidString)
        {
            Cursor = value
        };
        Assert.Same(value ?? Cursors.Default, control.Cursor);

        // Set same.
        control.Cursor = value;
        Assert.Same(value ?? Cursors.Default, control.Cursor);
    }

    [WinFormsTheory]
    [CommonMemberData(typeof(CommonTestHelperEx), nameof(CommonTestHelperEx.GetCursorTheoryData))]
    public void AxHost_Cursor_SetWithHandle_GetReturnsExpected(Cursor value)
    {
        using SubAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);

        control.Cursor = value;
        Assert.Same(value ?? Cursors.Default, control.Cursor);

        // Set same.
        control.Cursor = value;
        Assert.Same(value ?? Cursors.Default, control.Cursor);
    }

    [WinFormsTheory]
    [CommonMemberData(typeof(CommonTestHelperEx), nameof(CommonTestHelperEx.GetCursorTheoryData))]
    public void AxHost_Cursor_SetWithChildren_GetReturnsExpected(Cursor value)
    {
        Control child1 = new();
        Control child2 = new();
        using SubAxHost control = new(EmptyClsidString);
        control.Controls.Add(child1);
        control.Controls.Add(child2);

        control.Cursor = value;
        Assert.Same(value ?? Cursors.Default, control.Cursor);
        Assert.Same(value ?? Cursors.Default, child1.Cursor);
        Assert.Same(value ?? Cursors.Default, child2.Cursor);

        // Set same.
        control.Cursor = value;
        Assert.Same(value ?? Cursors.Default, control.Cursor);
        Assert.Same(value ?? Cursors.Default, child1.Cursor);
        Assert.Same(value ?? Cursors.Default, child2.Cursor);
    }

    [WinFormsTheory]
    [CommonMemberData(typeof(CommonTestHelperEx), nameof(CommonTestHelperEx.GetCursorTheoryData))]
    public void AxHost_Cursor_SetWithChildrenWithCursor_GetReturnsExpected(Cursor value)
    {
        Cursor cursor1 = new(1);
        Cursor cursor2 = new(1);
        Control child1 = new()
        {
            Cursor = cursor1
        };
        Control child2 = new()
        {
            Cursor = cursor2
        };
        using SubAxHost control = new(EmptyClsidString);
        control.Controls.Add(child1);
        control.Controls.Add(child2);

        control.Cursor = value;
        Assert.Same(value ?? Cursors.Default, control.Cursor);
        Assert.Same(cursor1, child1.Cursor);
        Assert.Same(cursor2, child2.Cursor);

        // Set same.
        control.Cursor = value;
        Assert.Same(value ?? Cursors.Default, control.Cursor);
        Assert.Same(cursor1, child1.Cursor);
        Assert.Same(cursor2, child2.Cursor);
    }

    [WinFormsTheory]
    [CommonMemberData(typeof(CommonTestHelperEx), nameof(CommonTestHelperEx.GetFontTheoryData))]
    public void AxHost_Font_Set_GetReturnsExpected(Font value)
    {
        using SubAxHost control = new(EmptyClsidString)
        {
            Font = value
        };
        Assert.Equal(value ?? Control.DefaultFont, control.Font);
        Assert.Equal(control.Font.Height, control.FontHeight);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.Font = value;
        Assert.Equal(value ?? Control.DefaultFont, control.Font);
        Assert.Equal(control.Font.Height, control.FontHeight);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [CommonMemberData(typeof(CommonTestHelperEx), nameof(CommonTestHelperEx.GetForeColorTheoryData))]
    public void AxHost_ForeColor_Set_GetReturnsExpected(Color value, Color expected)
    {
        using SubAxHost control = new(EmptyClsidString)
        {
            ForeColor = value
        };
        Assert.Equal(expected, control.ForeColor);

        // Set same.
        control.ForeColor = value;
        Assert.Equal(expected, control.ForeColor);
    }

    [WinFormsTheory]
    [EnumData<ImageLayout>]
    public void AxHost_ImeMode_Set_GetReturnsExpected(ImeMode value)
    {
        using SubAxHost control = new(EmptyClsidString)
        {
            ImeMode = value
        };
        Assert.Equal(value, control.ImeMode);

        // Set same.
        control.ImeMode = value;
        Assert.Equal(value, control.ImeMode);
    }

    [WinFormsTheory]
    [InvalidEnumData<ImeMode>]
    public void AxHost_ImeMode_SetInvalid_ThrowsInvalidEnumArgumentException(ImeMode value)
    {
        using SubAxHost control = new(EmptyClsidString);
        Assert.Throws<InvalidEnumArgumentException>("value", () => control.ImeMode = value);
    }

    [WinFormsTheory]
    [BoolData]
    public void AxHost_Enabled_Set_GetReturnsExpected(bool value)
    {
        using SubAxHost control = new(EmptyClsidString)
        {
            Enabled = value
        };
        Assert.Equal(value, control.Enabled);

        // Set same.
        control.Enabled = value;
        Assert.Equal(value, control.Enabled);

        // Set different.
        control.Enabled = !value;
        Assert.Equal(!value, control.Enabled);
    }

    [WinFormsTheory]
    [BoolData]
    public void AxHost_Site_SetDesignMode_CreatesOcx(bool otherDesignMode)
    {
        Mock<ISite> mockSite1 = new(MockBehavior.Strict);
        mockSite1
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite1
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite1
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite1
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite1
            .Setup(s => s.DesignMode)
            .Returns(true);
        using SubAxHost control = new(WebBrowserClsidString)
        {
            Site = mockSite1.Object
        };
        Assert.Same(mockSite1.Object, control.Site);
        Assert.False(control.IsHandleCreated);
        object ocx = control.GetOcx();
        Assert.NotNull(ocx);
        Assert.Same(ocx, control.GetOcx());

        // Set same.
        control.Site = mockSite1.Object;
        Assert.Same(mockSite1.Object, control.Site);
        Assert.False(control.IsHandleCreated);
        Assert.Same(ocx, control.GetOcx());

        // Set another.
        Mock<ISite> mockSite2 = new(MockBehavior.Strict);
        mockSite2
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite2
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite2
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite2
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite2
            .Setup(s => s.DesignMode)
            .Returns(otherDesignMode);
        control.Site = mockSite2.Object;
        Assert.Same(mockSite2.Object, control.Site);
        Assert.False(control.IsHandleCreated);
        Assert.Same(ocx, control.GetOcx());

        // Set null.
        control.Site = null;
        Assert.Null(control.Site);
        Assert.False(control.IsHandleCreated);
        Assert.Same(ocx, control.GetOcx());
    }

    [WinFormsFact]
    public void AxHost_Site_SetNonDesignModeThenDesignMode_CreatesOcx()
    {
        Mock<ISite> mockSite1 = new(MockBehavior.Strict);
        mockSite1
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite1
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite1
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite1
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite1
            .Setup(s => s.DesignMode)
            .Returns(false);
        using SubAxHost control = new(WebBrowserClsidString)
        {
            Site = mockSite1.Object
        };
        Assert.Same(mockSite1.Object, control.Site);
        Assert.False(control.IsHandleCreated);
        Assert.Null(control.GetOcx());

        // Set same.
        control.Site = mockSite1.Object;
        Assert.Same(mockSite1.Object, control.Site);
        Assert.False(control.IsHandleCreated);
        Assert.Null(control.GetOcx());

        // Set another.
        Mock<ISite> mockSite2 = new(MockBehavior.Strict);
        mockSite2
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite2
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite2
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite2
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite2
            .Setup(s => s.DesignMode)
            .Returns(true);
        control.Site = mockSite2.Object;
        Assert.Same(mockSite2.Object, control.Site);
        Assert.False(control.IsHandleCreated);
        object ocx = control.GetOcx();
        Assert.NotNull(ocx);
        Assert.Same(ocx, control.GetOcx());

        // Set null.
        control.Site = null;
        Assert.Null(control.Site);
        Assert.False(control.IsHandleCreated);
        Assert.Same(ocx, control.GetOcx());
    }

    [WinFormsFact]
    public void AxHost_Site_SetNonDesignModeThenNonDesignMode_DoesNotCreateOcx()
    {
        Mock<ISite> mockSite1 = new(MockBehavior.Strict);
        mockSite1
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite1
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite1
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite1
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite1
            .Setup(s => s.DesignMode)
            .Returns(false);
        using SubAxHost control = new(WebBrowserClsidString)
        {
            Site = mockSite1.Object
        };
        Assert.Same(mockSite1.Object, control.Site);
        Assert.False(control.IsHandleCreated);
        Assert.Null(control.GetOcx());

        // Set same.
        control.Site = mockSite1.Object;
        Assert.Same(mockSite1.Object, control.Site);
        Assert.False(control.IsHandleCreated);
        Assert.Null(control.GetOcx());

        // Set another.
        Mock<ISite> mockSite2 = new(MockBehavior.Strict);
        mockSite2
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite2
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite2
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite2
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite2
            .Setup(s => s.DesignMode)
            .Returns(false);
        control.Site = mockSite2.Object;
        Assert.Same(mockSite2.Object, control.Site);
        Assert.False(control.IsHandleCreated);
        Assert.Null(control.GetOcx());

        // Set null.
        control.Site = null;
        Assert.Null(control.Site);
        Assert.False(control.IsHandleCreated);
        Assert.Null(control.GetOcx());
    }

    [WinFormsTheory]
    [InlineData(true, true, 1, 1)]
    [InlineData(true, false, 1, 1)]
    [InlineData(false, true, 0, 1)]
    [InlineData(false, false, 0, 0)]
    public void AxHost_Site_SetWithHandle_CreatesOcx(bool designMode1, bool designMode2, int expectedCreatedCallCount1, int expectedCreatedCallCount2)
    {
        Mock<ISite> mockSite1 = new(MockBehavior.Strict);
        mockSite1
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite1
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite1
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite1
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite1
            .Setup(s => s.DesignMode)
            .Returns(designMode1);
        mockSite1
            .Setup(s => s.Name)
            .Returns("Name");
        using SubAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;
        object ocx = control.GetOcx();
        Assert.NotNull(ocx);

        control.Site = mockSite1.Object;
        Assert.Same(mockSite1.Object, control.Site);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(expectedCreatedCallCount1, createdCallCount);
        Assert.Same(ocx, control.GetOcx());

        // Set same.
        control.Site = mockSite1.Object;
        Assert.Same(mockSite1.Object, control.Site);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(expectedCreatedCallCount1, createdCallCount);
        Assert.Same(ocx, control.GetOcx());

        // Set another.
        Mock<ISite> mockSite2 = new(MockBehavior.Strict);
        mockSite2
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite2
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite2
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite2
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite2
            .Setup(s => s.DesignMode)
            .Returns(designMode2);
        mockSite2
            .Setup(s => s.Name)
            .Returns("Name");
        control.Site = mockSite2.Object;
        Assert.Same(mockSite2.Object, control.Site);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(expectedCreatedCallCount2, createdCallCount);
        Assert.Same(ocx, control.GetOcx());

        // Set null.
        control.Site = null;
        Assert.Null(control.Site);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(expectedCreatedCallCount2, createdCallCount);
        Assert.Same(ocx, control.GetOcx());
    }

    public static IEnumerable<object[]> Text_Set_TestData()
    {
        yield return new object[] { null, string.Empty };
        yield return new object[] { string.Empty, string.Empty };
        yield return new object[] { "text", "text" };
    }

    [WinFormsTheory]
    [MemberData(nameof(Text_Set_TestData))]
    public void AxHost_Text_Set_GetReturnsExpected(string value, string expected)
    {
        using SubAxHost control = new(EmptyClsidString)
        {
            Text = value
        };
        Assert.Equal(expected, control.Text);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.Text = value;
        Assert.Equal(expected, control.Text);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [MemberData(nameof(Text_Set_TestData))]
    public void AxHost_Text_SetWithHandle_GetReturnsExpected(string value, string expected)
    {
        using SubAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        control.Text = value;
        Assert.Equal(expected, control.Text);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Set same.
        control.Text = value;
        Assert.Equal(expected, control.Text);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void AxHost_BackColorChanged_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.BackColorChanged += handler);
        control.BackColorChanged -= handler;
    }

    [WinFormsFact]
    public void AxHost_BackgroundImageChanged_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.BackgroundImageChanged += handler);
        control.BackgroundImageChanged -= handler;
    }

    [WinFormsFact]
    public void AxHost_BackgroundImageLayoutChanged_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.BackgroundImageLayoutChanged += handler);
        control.BackgroundImageLayoutChanged -= handler;
    }

    [WinFormsFact]
    public void AxHost_BindingContextChanged_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.BindingContextChanged += handler);
        control.BindingContextChanged -= handler;
    }

    [WinFormsFact]
    public void AxHost_ChangeUICues_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        UICuesEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.ChangeUICues += handler);
        control.ChangeUICues -= handler;
    }

    [WinFormsFact]
    public void AxHost_Click_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.Click += handler);
        control.Click -= handler;
    }

    [WinFormsFact]
    public void AxHost_CursorChanged_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.CursorChanged += handler);
        control.CursorChanged -= handler;
    }

    [WinFormsFact]
    public void AxHost_DoubleClick_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.DoubleClick += handler);
        control.DoubleClick -= handler;
    }

    [WinFormsFact]
    public void AxHost_DragDrop_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        DragEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.DragDrop += handler);
        control.DragDrop -= handler;
    }

    [WinFormsFact]
    public void AxHost_DragEnter_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        DragEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.DragEnter += handler);
        control.DragEnter -= handler;
    }

    [WinFormsFact]
    public void AxHost_DragLeave_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.DragLeave += handler);
        control.DragLeave -= handler;
    }

    [WinFormsFact]
    public void AxHost_DragOver_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        DragEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.DragOver += handler);
        control.DragOver -= handler;
    }

    [WinFormsFact]
    public void AxHost_EnabledChanged_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.EnabledChanged += handler);
        control.EnabledChanged -= handler;
    }

    [WinFormsFact]
    public void AxHost_FontChanged_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.FontChanged += handler);
        control.FontChanged -= handler;
    }

    [WinFormsFact]
    public void AxHost_ForeColorChanged_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.ForeColorChanged += handler);
        control.ForeColorChanged -= handler;
    }

    [WinFormsFact]
    public void AxHost_GiveFeedback_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        GiveFeedbackEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.GiveFeedback += handler);
        control.GiveFeedback -= handler;
    }

    [WinFormsFact]
    public void AxHost_HelpRequested_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        HelpEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.HelpRequested += handler);
        control.HelpRequested -= handler;
    }

    [WinFormsFact]
    public void AxHost_ImeModeChanged_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.ImeModeChanged += handler);
        control.ImeModeChanged -= handler;
    }

    [WinFormsFact]
    public void AxHost_KeyDown_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        KeyEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.KeyDown += handler);
        control.KeyDown -= handler;
    }

    [WinFormsFact]
    public void AxHost_KeyPress_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        KeyPressEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.KeyPress += handler);
        control.KeyPress -= handler;
    }

    [WinFormsFact]
    public void AxHost_KeyUp_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        KeyEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.KeyUp += handler);
        control.KeyUp -= handler;
    }

    [WinFormsFact]
    public void AxHost_Layout_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        LayoutEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.Layout += handler);
        control.Layout -= handler;
    }

    [WinFormsFact]
    public void AxHost_MouseClick_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.MouseClick += handler);
        control.MouseClick -= handler;
    }

    [WinFormsFact]
    public void AxHost_MouseDoubleClick_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.MouseDoubleClick += handler);
        control.MouseDoubleClick -= handler;
    }

    [WinFormsFact]
    public void AxHost_MouseDown_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        MouseEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.MouseDown += handler);
        control.MouseDown -= handler;
    }

    [WinFormsFact]
    public void AxHost_MouseEnter_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.MouseEnter += handler);
        control.MouseEnter -= handler;
    }

    [WinFormsFact]
    public void AxHost_MouseHover_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.MouseHover += handler);
        control.MouseHover -= handler;
    }

    [WinFormsFact]
    public void AxHost_MouseLeave_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.MouseLeave += handler);
        control.MouseLeave -= handler;
    }

    [WinFormsFact]
    public void AxHost_MouseMove_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        MouseEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.MouseMove += handler);
        control.MouseMove -= handler;
    }

    [WinFormsFact]
    public void AxHost_MouseUp_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        MouseEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.MouseUp += handler);
        control.MouseUp -= handler;
    }

    [WinFormsFact]
    public void AxHost_MouseWheel_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        MouseEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.MouseWheel += handler);
        control.MouseWheel -= handler;
    }

    [WinFormsFact]
    public void AxHost_Paint_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        PaintEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.Paint += handler);
        control.Paint -= handler;
    }

    [WinFormsFact]
    public void AxHost_QueryAccessibilityHelp__AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        QueryAccessibilityHelpEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.QueryAccessibilityHelp += handler);
        control.QueryAccessibilityHelp -= handler;
    }

    [WinFormsFact]
    public void AxHost_QueryContinueDrag__AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        QueryContinueDragEventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.QueryContinueDrag += handler);
        control.QueryContinueDrag -= handler;
    }

    [WinFormsFact]
    public void AxHost_RightToLeftChanged_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.RightToLeftChanged += handler);
        control.RightToLeftChanged -= handler;
    }

    [WinFormsFact]
    public void AxHost_StyleChanged_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.StyleChanged += handler);
        control.StyleChanged -= handler;
    }

    [WinFormsFact]
    public void AxHost_TextChanged_AddRemove_ThrowsNotSupportedException()
    {
        using SubAxHost control = new(EmptyClsidString);
        EventHandler handler = (sender, e) => { };
        Assert.Throws<NotSupportedException>(() => control.TextChanged += handler);
        control.TextChanged -= handler;
    }

    [WinFormsFact]
    public void AxHost_AttachInterfaces_Invoke_Nop()
    {
        using SubAxHost control = new(EmptyClsidString);
        control.AttachInterfaces();
        control.AttachInterfaces();
    }

    [WinFormsFact]
    public void AxHost_BeginInit_Invoke_Nop()
    {
        using SubAxHost control = new(EmptyClsidString);
        control.BeginInit();
        control.BeginInit();
        Assert.False(control.Created);
    }

    public static IEnumerable<object[]> DoVerb_TestData()
    {
        yield return new object[] { 1 };
        yield return new object[] { 0 };
        yield return new object[] { -1 };
        yield return new object[] { -2 };
        yield return new object[] { -3 };
        yield return new object[] { -4 };
        yield return new object[] { -5 };
        yield return new object[] { -6 };
        yield return new object[] { -7 };
    }

    [WinFormsTheory]
    [MemberData(nameof(DoVerb_TestData))]
    public void AxHost_DoVerb_InvokeWithHandle_Success(int verb)
    {
        using NoAssertContext context = new();
        using SubAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        control.DoVerb(verb);
    }

    [WinFormsTheory]
    [MemberData(nameof(DoVerb_TestData))]
    public void AxHost_DoVerb_InvokeWithHandleWithParent_Success(int verb)
    {
        using NoAssertContext context = new();
        using Control parent = new();
        using SubAxHost control = new(WebBrowserClsidString)
        {
            Parent = parent
        };

        Assert.NotEqual(IntPtr.Zero, control.Handle);
        Assert.True(parent.IsHandleCreated);
        control.DoVerb(verb);
        Assert.True(parent.IsHandleCreated);
    }

    [WinFormsTheory]
    [MemberData(nameof(DoVerb_TestData))]
    public void AxHost_DoVerb_InvokeWithHandleWithParentWithoutHandle_Success(int verb)
    {
        using NoAssertContext context = new();
        using Control parent = new();
        using SubAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        control.Parent = parent;
        Assert.False(parent.IsHandleCreated);
        control.DoVerb(verb);
        Assert.True(parent.IsHandleCreated);
    }

    [WinFormsTheory]
    [MemberData(nameof(DoVerb_TestData))]
    public void AxHost_DoVerb_InvokeWithoutHandle_ThrowsNullReferenceException(int verb)
    {
        using SubAxHost control = new(EmptyClsidString);
        Assert.Throws<NullReferenceException>(() => control.DoVerb(verb));
    }

    [WinFormsFact]
    public void AxHost_EndInit_Invoke_Nop()
    {
        using SubAxHost control = new(EmptyClsidString);
        control.EndInit();
        control.EndInit();
        Assert.False(control.Created);
    }

    [WinFormsFact]
    public void AxHost_EndInit_InvokeWithParent_CreatesControl()
    {
        using Control parent = new();
        using SubAxHost control = new(WebBrowserClsidString)
        {
            Parent = parent
        };
        control.EndInit();
        control.EndInit();
        Assert.True(parent.Created);
        Assert.True(control.Created);
    }

    [ComImport]
    [Guid("D30C1661-CDAF-11d0-8A3E-00C04FC9E26E")]
    public interface IWebBrowser2
    {
    }

    [WinFormsFact]
    public void AxHost_CreateControl_ValidClsid_Success()
    {
        using SubAxHost control = new(WebBrowserClsidString);
        control.CreateControl();
        Assert.True(control.Created);
        Assert.NotEqual(IntPtr.Zero, control.Handle);

        object ocx = control.GetOcx();
        Assert.True(ocx is IWebBrowser2);
    }

    [WinFormsFact]
    public void AxHost_CreateControl_InvalidClsid_ThrowsCOMException()
    {
        using SubAxHost control = new(EmptyClsidString);
        Assert.Throws<COMException>(control.CreateControl);
    }

    [WinFormsFact]
    public void AxHost_CreateSink_Invoke_Nop()
    {
        using SubAxHost control = new(EmptyClsidString);
        control.CreateSink();
        control.CreateSink();
        Assert.False(control.Created);
    }

    [WinFormsFact]
    public void AxHost_DetachSink_Invoke_Nop()
    {
        using SubAxHost control = new(EmptyClsidString);
        control.DetachSink();
        control.DetachSink();
        Assert.False(control.Created);
    }

    [WinFormsFact]
    public void AxHost_GetOcx_NotCreated_ReturnsNull()
    {
        using SubAxHost control = new(EmptyClsidString);
        Assert.Null(control.GetOcx());
    }

    [WinFormsFact]
    public void AxHost_GetOcx_InvokeWithHandle_ReturnsExpected()
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        object ocx = control.GetOcx();
        Assert.NotNull(ocx);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void AxHost_GetFontFromIFont_NullFont_ReturnsNull()
    {
        Assert.Null(SubAxHost.GetFontFromIFont(null));
    }

    [WinFormsFact]
    public void AxHost_GetFontFromIFont_InvalidFont_ThrowsInvalidCastException()
    {
        Assert.Throws<InvalidCastException>(() => SubAxHost.GetFontFromIFont(new object()));
    }

    [WinFormsFact]
    public void AxHost_GetIFontDispFromFont_InvokeSimpleStyle_Roundtrips()
    {
        using Font font = new("Arial", 10);
        object disp = SubAxHost.GetIFontDispFromFont(font);
        IFont.Interface iFont = (IFont.Interface)disp;
        Assert.Equal(font.Name, iFont.Name.ToStringAndFree());
        Assert.Equal(97500, iFont.Size.int64);
        Assert.False(iFont.Bold);
        Assert.False(iFont.Italic);
        Assert.False(iFont.Underline);
        Assert.False(iFont.Strikethrough);
        // Charset is locale specific
        // Assert.Equal(0, iFont.Charset);
        Assert.NotEqual(IntPtr.Zero, iFont.hFont);

        Font result = SubAxHost.GetFontFromIFont(iFont);
        Assert.Equal(font.Name, result.Name);
        Assert.Equal(9.75, result.Size);
        Assert.Equal(font.Style, result.Style);
        Assert.Equal(1, result.GdiCharSet);

        result = SubAxHost.GetFontFromIFont((IFontDisp.Interface)disp);
        Assert.Equal(font.Name, result.Name);
        Assert.Equal(9.75, result.Size);
        Assert.Equal(font.Style, result.Style);
        Assert.Equal(1, result.GdiCharSet);
    }

    [WinFormsFact]
    public void AxHost_GetIFontDispFromFont_InvokeComplexStyle_Roundtrips()
    {
        using Font font = new("Arial", 10, FontStyle.Bold | FontStyle.Underline | FontStyle.Italic | FontStyle.Strikeout, GraphicsUnit.Point, 10);
        object disp = SubAxHost.GetIFontDispFromFont(font);

        IFont.Interface iFont = (IFont.Interface)disp;
        Assert.Equal(font.Name, iFont.Name.ToStringAndFree());
        Assert.Equal(97500, iFont.Size.int64);
        Assert.True(iFont.Bold);
        Assert.True(iFont.Italic);
        Assert.True(iFont.Underline);
        Assert.True(iFont.Strikethrough);
        Assert.Equal(0, iFont.Charset);
        Assert.NotEqual(IntPtr.Zero, iFont.hFont);

        Font result = SubAxHost.GetFontFromIFont(iFont);
        Assert.Equal(font.Name, result.Name);
        Assert.Equal(9.75, result.Size);
        Assert.Equal(font.Style, result.Style);
        Assert.Equal(10, result.GdiCharSet);

        result = SubAxHost.GetFontFromIFont((IFontDisp.Interface)disp);
        Assert.Equal(font.Name, result.Name);
        Assert.Equal(9.75, result.Size);
        Assert.Equal(font.Style, result.Style);
        Assert.Equal(10, result.GdiCharSet);
    }

    [WinFormsTheory]
    [InlineData(GraphicsUnit.Document)]
    [InlineData(GraphicsUnit.Inch)]
    [InlineData(GraphicsUnit.Millimeter)]
    [InlineData(GraphicsUnit.Pixel)]
    [InlineData(GraphicsUnit.World)]
    public void AxHost_GetIFontDispFromFont_InvalidFontUnit_ThrowsArgumentException(GraphicsUnit unit)
    {
        using Font font = new("Arial", 10, unit);
        Assert.Throws<ArgumentException>("font", () => SubAxHost.GetIFontDispFromFont(font));
    }

    [WinFormsFact]
    public void AxHost_GetIFontDispFromFont_NullFont_ReturnsNull()
    {
        Assert.Null(SubAxHost.GetIFontDispFromFont(null));
    }

    [WinFormsFact]
    public void AxHost_GetIFontFromFont_InvokeSimpleStyle_Roundtrips()
    {
        using Font font = new("Arial", 10);
        IFont.Interface iFont = (IFont.Interface)SubAxHost.GetIFontFromFont(font);
        Assert.Equal(font.Name, iFont.Name.ToStringAndFree());
        Assert.Equal(97500, iFont.Size.int64);
        Assert.False(iFont.Bold);
        Assert.False(iFont.Italic);
        Assert.False(iFont.Underline);
        Assert.False(iFont.Strikethrough);
        // Charset is locale specific
        // Assert.Equal(0, iFont.Charset);
        Assert.NotEqual(IntPtr.Zero, iFont.hFont);

        Font result = SubAxHost.GetFontFromIFont(iFont);
        Assert.Equal(font.Name, result.Name);
        Assert.Equal(9.75, result.Size);
        Assert.Equal(font.Style, result.Style);
        Assert.Equal(1, result.GdiCharSet);
    }

    [WinFormsFact]
    public void AxHost_GetIFontFromFont_InvokeComplexStyle_Roundtrips()
    {
        using Font font = new("Arial", 10, FontStyle.Bold | FontStyle.Underline | FontStyle.Italic | FontStyle.Strikeout, GraphicsUnit.Point, 10);
        IFont.Interface iFont = (IFont.Interface)SubAxHost.GetIFontFromFont(font);
        Assert.Equal(font.Name, iFont.Name.ToStringAndFree());
        Assert.Equal(97500, iFont.Size.int64);
        Assert.True(iFont.Bold);
        Assert.True(iFont.Italic);
        Assert.True(iFont.Underline);
        Assert.True(iFont.Strikethrough);
        Assert.Equal(0, iFont.Charset);
        Assert.NotEqual(IntPtr.Zero, iFont.hFont);

        Font result = SubAxHost.GetFontFromIFont(iFont);
        Assert.Equal(font.Name, result.Name);
        Assert.Equal(9.75, result.Size);
        Assert.Equal(font.Style, result.Style);
        Assert.Equal(10, result.GdiCharSet);
    }

    [WinFormsTheory]
    [InlineData(GraphicsUnit.Document)]
    [InlineData(GraphicsUnit.Inch)]
    [InlineData(GraphicsUnit.Millimeter)]
    [InlineData(GraphicsUnit.Pixel)]
    [InlineData(GraphicsUnit.World)]
    public void AxHost_GetIFontFromFont_InvalidFontUnit_ThrowsArgumentException(GraphicsUnit unit)
    {
        using Font font = new("Arial", 10, unit);
        Assert.Throws<ArgumentException>("font", () => SubAxHost.GetIFontFromFont(font));
    }

    [WinFormsFact]
    public void AxHost_GetIFontFromFont_NullFont_ReturnsNull()
    {
        Assert.Null(SubAxHost.GetIFontFromFont(null));
    }

    [WinFormsFact]
    public unsafe void AxHost_GetIPictureFromCursor_Invoke_Roundtrips()
    {
        using Cursor original = new("bitmaps/cursor.cur");
        IPicture.Interface iPicture = (IPicture.Interface)SubAxHost.GetIPictureFromCursor(original);
        Assert.NotNull(iPicture);

        iPicture.get_Handle(out OLE_HANDLE handle).ThrowOnFailure();
        iPicture.get_Type(out PICTYPE type).ThrowOnFailure();
        iPicture.get_Width(out int width).ThrowOnFailure();
        iPicture.get_Height(out int height).ThrowOnFailure();
        iPicture.get_Attributes(out uint attributes).ThrowOnFailure();
        iPicture.get_CurDC(out HDC hdc).Should().Be(HRESULT.E_FAIL);

        Assert.NotEqual(0u, handle);
        Assert.True(iPicture.get_hPal(out _).Failed);
        Assert.Equal(PICTYPE.PICTYPE_ICON, type);
        Assert.Equal(847, width);
        Assert.Equal(847, height);
        Assert.Equal(2u, attributes);

        Assert.Throws<InvalidCastException>(() => SubAxHost.GetPictureFromIPicture(iPicture));
    }

    [WinFormsFact]
    public unsafe void AxHost_GetIPictureDispFromPicture_InvokeBitmap_Roundtrips()
    {
        Bitmap original = new(10, 11);
        original.SetPixel(1, 2, Color.FromArgb(unchecked((int)0xFF010203)));
        object disp = SubAxHost.GetIPictureDispFromPicture(original);
        using var iPictureDisp = ComHelpers.GetComScope<IDispatch>(disp);

        VARIANT variant = iPictureDisp.Value->GetProperty(PInvokeCore.DISPID_PICT_HANDLE);
        Assert.NotEqual(0u, variant.data.uintVal);
        variant = iPictureDisp.Value->GetProperty(PInvokeCore.DISPID_PICT_HPAL);
        Assert.Equal(0u, variant.data.uintVal);
        variant = iPictureDisp.Value->GetProperty(PInvokeCore.DISPID_PICT_TYPE);
        Assert.Equal(1, variant.data.iVal);
        variant = iPictureDisp.Value->GetProperty(PInvokeCore.DISPID_PICT_WIDTH);
        Assert.Equal(265u, variant.data.uintVal);
        variant = iPictureDisp.Value->GetProperty(PInvokeCore.DISPID_PICT_HEIGHT);
        Assert.Equal(291u, variant.data.uintVal);

        var result = Assert.IsType<Bitmap>(SubAxHost.GetPictureFromIPictureDisp(disp));
        Assert.Equal(original.Size, result.Size);
        Assert.Equal(PixelFormat.Format32bppRgb, result.PixelFormat);
        Assert.Equal(Color.FromArgb(unchecked((int)0xFF010203)), original.GetPixel(1, 2));
    }

    [WinFormsFact]
    public unsafe void AxHost_GetIPictureDispFromPicture_InvokeEnhancedMetafile_Roundtrips()
    {
        Metafile original = new("bitmaps/milkmateya01.emf");
        object disp = SubAxHost.GetIPictureDispFromPicture(original);

        using var iPictureDisp = ComHelpers.GetComScope<IDispatch>(disp);

        VARIANT variant = iPictureDisp.Value->GetProperty(PInvokeCore.DISPID_PICT_HANDLE);
        Assert.NotEqual(0u, variant.data.uintVal);
        Assert.True(iPictureDisp.Value->TryGetProperty(PInvokeCore.DISPID_PICT_HPAL, &variant).Failed);
        variant = iPictureDisp.Value->GetProperty(PInvokeCore.DISPID_PICT_TYPE);
        Assert.Equal(4, variant.data.iVal);
        variant = iPictureDisp.Value->GetProperty(PInvokeCore.DISPID_PICT_WIDTH);
        Assert.Equal(19972u, variant.data.uintVal);
        variant = iPictureDisp.Value->GetProperty(PInvokeCore.DISPID_PICT_HEIGHT);
        Assert.Equal(28332u, variant.data.uintVal);

        var result = Assert.IsType<Metafile>(SubAxHost.GetPictureFromIPictureDisp(disp));
        Assert.Equal(new Size(759, 1073), result.Size);
    }

    [WinFormsFact]
    public void AxHost_GetIPictureDispFromPicture_InvokeMetafile_ThrowsCOMException()
    {
        Metafile original = new("bitmaps/telescope_01.wmf");
        Assert.Throws<COMException>(() => SubAxHost.GetIPictureDispFromPicture(original));
    }

    [WinFormsFact]
    public void AxHost_GetIPictureDispFromPicture_NullImage_ReturnsNull()
    {
        Assert.Null(SubAxHost.GetIPictureDispFromPicture(null));
    }

    [WinFormsFact]
    public unsafe void AxHost_GetIPictureFromPicture_InvokeBitmap_Roundtrips()
    {
        Bitmap original = new(10, 11);
        original.SetPixel(1, 2, Color.FromArgb(unchecked((int)0xFF010203)));
        IPicture.Interface iPicture = (IPicture.Interface)SubAxHost.GetIPictureFromPicture(original);
        Assert.NotNull(iPicture);

        iPicture.get_Handle(out OLE_HANDLE handle).ThrowOnFailure();
        iPicture.get_hPal(out OLE_HANDLE hPal).ThrowOnFailure();
        iPicture.get_Type(out PICTYPE type).ThrowOnFailure();
        iPicture.get_Width(out int width).ThrowOnFailure();
        iPicture.get_Height(out int height).ThrowOnFailure();
        iPicture.get_Attributes(out uint attributes).ThrowOnFailure();
        iPicture.get_CurDC(out HDC curDc).ThrowOnFailure();

        Assert.NotEqual(0u, handle);
        Assert.Equal(0u, hPal);
        Assert.Equal(PICTYPE.PICTYPE_BITMAP, type);
        Assert.Equal(265, width);
        Assert.Equal(291, height);
        Assert.Equal(default, curDc);
        Assert.Equal(0u, attributes);

        var result = Assert.IsType<Bitmap>(SubAxHost.GetPictureFromIPicture(iPicture));
        Assert.Equal(original.Size, result.Size);
        Assert.Equal(PixelFormat.Format32bppRgb, result.PixelFormat);
        Assert.Equal(Color.FromArgb(unchecked((int)0xFF010203)), original.GetPixel(1, 2));
    }

    [WinFormsFact]
    public unsafe void AxHost_GetIPictureFromPicture_InvokeEnhancedMetafile_Roundtrips()
    {
        Metafile original = new("bitmaps/milkmateya01.emf");
        IPicture.Interface iPicture = (IPicture.Interface)SubAxHost.GetIPictureFromPicture(original);
        Assert.NotNull(iPicture);

        iPicture.get_Handle(out OLE_HANDLE handle).ThrowOnFailure();
        iPicture.get_Type(out PICTYPE type).ThrowOnFailure();
        iPicture.get_Width(out int width).ThrowOnFailure();
        iPicture.get_Height(out int height).ThrowOnFailure();
        iPicture.get_Attributes(out uint attributes).ThrowOnFailure();
        iPicture.get_CurDC(out HDC _).Should().Be(HRESULT.E_FAIL);

        Assert.NotEqual(0u, handle);
        Assert.True(iPicture.get_hPal(out _).Failed);
        Assert.Equal(PICTYPE.PICTYPE_ENHMETAFILE, type);
        Assert.Equal(19972, width);
        Assert.Equal(28332, height);
        Assert.Equal(3u, attributes);

        var result = Assert.IsType<Metafile>(SubAxHost.GetPictureFromIPicture(iPicture));
        Assert.Equal(new Size(759, 1073), result.Size);
    }

    [WinFormsFact]
    public void AxHost_GetIPictureFromPicture_InvokeMetafile_ThrowsCOMException()
    {
        Metafile original = new("bitmaps/telescope_01.wmf");
        Assert.Throws<COMException>(() => SubAxHost.GetIPictureFromPicture(original));
    }

    [WinFormsFact]
    public void AxHost_GetIPictureFromPicture_NullImage_ReturnsNull()
    {
        Assert.Null(SubAxHost.GetIPictureFromPicture(null));
    }

    [WinFormsFact]
    public void AxHost_GetPictureFromIPicture_InvokeInvalid_ThrowsInvalidCastException()
    {
        Assert.Throws<InvalidCastException>(() => SubAxHost.GetPictureFromIPicture(new object()));
    }

    [WinFormsFact]
    public void AxHost_GetPictureFromIPicture_NullPicture_ReturnsNull()
    {
        Assert.Null(SubAxHost.GetPictureFromIPicture(null));
    }

    [WinFormsFact]
    public void AxHost_InvokeEditMode_Invoke_Success()
    {
        using SubAxHost control = new(EmptyClsidString);
        control.InvokeEditMode();
        Assert.Null(control.GetOcx());

        // Call again.
        control.InvokeEditMode();
        Assert.Null(control.GetOcx());
    }

    public static IEnumerable<object[]> InvokeEditMode_Site_TestData()
    {
        yield return new object[] { true, null, 2 };
        yield return new object[] { true, new(), 2 };

        yield return new object[] { false, null, 1 };
        yield return new object[] { false, new(), 1 };
        yield return new object[] { false, new Mock<ISelectionService>(MockBehavior.Strict).Object, 1 };
    }

    [WinFormsTheory]
    [MemberData(nameof(InvokeEditMode_Site_TestData))]
    public void AxHost_InvokeEditMode_InvokeWithSite_Success(bool designMode, object selectionService, int expectedCallCount)
    {
        Mock<ISite> mockSite = new(MockBehavior.Strict);
        mockSite
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite
            .Setup(s => s.DesignMode)
            .Returns(designMode);
        mockSite
            .Setup(s => s.GetService(typeof(ISelectionService)))
            .Returns(selectionService)
            .Verifiable();
        mockSite
            .Setup(s => s.Name)
            .Returns("Name");
        using SubAxHost control = new(WebBrowserClsidString)
        {
            Site = mockSite.Object
        };
        control.InvokeEditMode();
        Assert.False(control.IsHandleCreated);
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(expectedCallCount));

        // Call again.
        control.InvokeEditMode();
        Assert.False(control.IsHandleCreated);
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(expectedCallCount));
    }

    public static IEnumerable<object[]> InvokeEditMode_SiteWithParent_TestData()
    {
        yield return new object[] { true, null, 3 };
        yield return new object[] { true, new(), 3 };

        yield return new object[] { false, null, 1 };
        yield return new object[] { false, new(), 1 };
        yield return new object[] { false, new Mock<ISelectionService>(MockBehavior.Strict).Object, 1 };
    }

    [WinFormsTheory]
    [MemberData(nameof(InvokeEditMode_SiteWithParent_TestData))]
    public void AxHost_InvokeEditMode_InvokeWithSiteWithParent_Success(bool designMode, object selectionService, int expectedCallCount)
    {
        using Control parent = new();
        Mock<ISite> mockSite = new(MockBehavior.Strict);

        mockSite
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite
            .Setup(s => s.DesignMode)
            .Returns(designMode);
        mockSite
            .Setup(s => s.GetService(typeof(ISelectionService)))
            .Returns(selectionService)
            .Verifiable();
        mockSite
            .Setup(s => s.GetService(typeof(IExtenderListService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDictionaryService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(ITypeDescriptorFilterService)))
            .Returns(null);
        mockSite
            .Setup(s => s.Name)
            .Returns("Name");

        using SubAxHost control = new(WebBrowserClsidString)
        {
            Parent = parent,
            Site = mockSite.Object
        };

        control.InvokeEditMode();
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(expectedCallCount));

        // Call again.
        control.InvokeEditMode();
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(expectedCallCount));
    }

    [WinFormsTheory]
    [BoolData]
    public void AxHost_InvokeEditMode_InvokeWithSiteDesignModeWithComponentSelectedNoSelectionStyleProperty_Success(bool componentSelected)
    {
        using SubAxHost control = new(WebBrowserClsidString);
        Mock<ISelectionService> mockSelectionService = new(MockBehavior.Strict);
        mockSelectionService
            .Setup(s => s.GetComponentSelected(control))
            .Returns(componentSelected)
            .Verifiable();
        Mock<ISite> mockSite = new(MockBehavior.Strict);
        mockSite
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite
            .Setup(s => s.DesignMode)
            .Returns(true);
        mockSite
            .Setup(s => s.GetService(typeof(ISelectionService)))
            .Returns(mockSelectionService.Object)
            .Verifiable();
        mockSite
            .Setup(s => s.GetService(typeof(IExtenderListService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDictionaryService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(ITypeDescriptorFilterService)))
            .Returns(null);
        mockSite
            .Setup(s => s.Name)
            .Returns("Name");
        control.Site = mockSite.Object;
        control.InvokeEditMode();
        Assert.False(control.IsHandleCreated);
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(2));
        mockSelectionService.Verify(s => s.GetComponentSelected(control), Times.Once());

        // Call again.
        control.InvokeEditMode();
        Assert.False(control.IsHandleCreated);
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(2));
        mockSelectionService.Verify(s => s.GetComponentSelected(control), Times.Once());
    }

    [WinFormsTheory]
    [BoolData]
    public void AxHost_InvokeEditMode_InvokeWithSiteDesignModeWithComponentSelectedInvalidSelectionStyleProperty_Success(bool componentSelected)
    {
        using InvalidSelectionStyleAxHost control = new(WebBrowserClsidString);
        Mock<ISelectionService> mockSelectionService = new(MockBehavior.Strict);
        mockSelectionService
            .Setup(s => s.GetComponentSelected(control))
            .Returns(componentSelected)
            .Verifiable();
        Mock<ISite> mockSite = new(MockBehavior.Strict);
        mockSite
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite
            .Setup(s => s.DesignMode)
            .Returns(true);
        mockSite
            .Setup(s => s.GetService(typeof(ISelectionService)))
            .Returns(mockSelectionService.Object)
            .Verifiable();
        mockSite
            .Setup(s => s.GetService(typeof(IExtenderListService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDictionaryService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(ITypeDescriptorFilterService)))
            .Returns(null);
        mockSite
            .Setup(s => s.Name)
            .Returns("Name");
        control.Site = mockSite.Object;
        control.InvokeEditMode();
        Assert.Null(control.SelectionStyle);
        Assert.False(control.IsHandleCreated);
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(2));
        mockSelectionService.Verify(s => s.GetComponentSelected(control), Times.Once());

        // Call again.
        control.InvokeEditMode();
        Assert.Null(control.SelectionStyle);
        Assert.False(control.IsHandleCreated);
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(2));
        mockSelectionService.Verify(s => s.GetComponentSelected(control), Times.Once());
    }

    [WinFormsTheory]
    [BoolData]
    public void AxHost_InvokeEditMode_InvokeWithSiteDesignModeWithComponentSelectedValidSelectionStyleProperty_Success(bool componentSelected)
    {
        using ValidSelectionStyleAxHost control = new(WebBrowserClsidString);
        Mock<ISelectionService> mockSelectionService = new(MockBehavior.Strict);
        mockSelectionService
            .Setup(s => s.GetComponentSelected(control))
            .Returns(componentSelected)
            .Verifiable();
        Mock<ISite> mockSite = new(MockBehavior.Strict);
        mockSite
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite
            .Setup(s => s.DesignMode)
            .Returns(true);
        mockSite
            .Setup(s => s.GetService(typeof(ISelectionService)))
            .Returns(mockSelectionService.Object)
            .Verifiable();
        mockSite
            .Setup(s => s.GetService(typeof(IExtenderListService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDictionaryService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(ITypeDescriptorFilterService)))
            .Returns(null);
        mockSite
            .Setup(s => s.Name)
            .Returns("Name");
        control.Site = mockSite.Object;

        control.InvokeEditMode();
        Assert.Equal(0, control.SelectionStyle);
        Assert.False(control.IsHandleCreated);
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(2));
        mockSelectionService.Verify(s => s.GetComponentSelected(control), Times.Once());

        // Call again.
        control.InvokeEditMode();
        Assert.Equal(0, control.SelectionStyle);
        Assert.False(control.IsHandleCreated);
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(2));
        mockSelectionService.Verify(s => s.GetComponentSelected(control), Times.Once());
    }

    public static IEnumerable<object[]> InvokeEditMode_SiteWithHandle_TestData()
    {
        yield return new object[] { true, null, 3 };
        yield return new object[] { true, new(), 3 };

        yield return new object[] { false, null, 1 };
        yield return new object[] { false, new(), 1 };
        yield return new object[] { false, new Mock<ISelectionService>(MockBehavior.Strict).Object, 1 };
    }

    [WinFormsTheory]
    [MemberData(nameof(InvokeEditMode_SiteWithHandle_TestData))]
    public void AxHost_InvokeEditMode_InvokeWithSiteWithHandle_Success(bool designMode, object selectionService, int expectedCallCount)
    {
        Mock<ISite> mockSite = new(MockBehavior.Strict);
        mockSite
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite
            .Setup(s => s.DesignMode)
            .Returns(designMode);
        mockSite
            .Setup(s => s.GetService(typeof(ISelectionService)))
            .Returns(selectionService)
            .Verifiable();
        mockSite
            .Setup(s => s.GetService(typeof(IExtenderListService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDictionaryService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(ITypeDescriptorFilterService)))
            .Returns(null);
        mockSite
            .Setup(s => s.Name)
            .Returns("Name");
        using SubAxHost control = new(WebBrowserClsidString)
        {
            Site = mockSite.Object
        };
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        control.InvokeEditMode();
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(expectedCallCount));

        // Call again.
        control.InvokeEditMode();
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(expectedCallCount));
    }

    [WinFormsTheory]
    [MemberData(nameof(InvokeEditMode_SiteWithParent_TestData))]
    public void AxHost_InvokeEditMode_InvokeWithSiteWithParentWithHandle_Success(bool designMode, object selectionService, int expectedCallCount)
    {
        using Control parent = new();
        Mock<ISite> mockSite = new(MockBehavior.Strict);
        mockSite
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite
            .Setup(s => s.DesignMode)
            .Returns(designMode);
        mockSite
            .Setup(s => s.GetService(typeof(ISelectionService)))
            .Returns(selectionService)
            .Verifiable();
        mockSite
            .Setup(s => s.GetService(typeof(IExtenderListService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDictionaryService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(ITypeDescriptorFilterService)))
            .Returns(null);
        mockSite
            .Setup(s => s.Name)
            .Returns("Name");
        using SubAxHost control = new(WebBrowserClsidString)
        {
            Parent = parent,
            Site = mockSite.Object
        };
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        control.InvokeEditMode();
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
        Assert.True(parent.IsHandleCreated);
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(expectedCallCount));

        // Call again.
        control.InvokeEditMode();
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
        Assert.True(parent.IsHandleCreated);
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(expectedCallCount));
    }

    [WinFormsTheory]
    [InlineData(true, 2)]
    [InlineData(false, 0)]
    public void AxHost_InvokeEditMode_InvokeWithSiteDesignModeWithComponentSelectedValidSelectionStylePropertyWithHandle_Success(bool componentSelected, int expectedSelectionStyle)
    {
        using ValidSelectionStyleAxHost control = new(WebBrowserClsidString);
        Mock<ISelectionService> mockSelectionService = new(MockBehavior.Strict);
        mockSelectionService
            .Setup(s => s.GetComponentSelected(control))
            .Returns(componentSelected)
            .Verifiable();
        Mock<ISite> mockSite = new(MockBehavior.Strict);
        mockSite
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        mockSite
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IComponentChangeService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDesignerHost)))
            .Returns(null);
        mockSite
            .Setup(s => s.DesignMode)
            .Returns(true);
        mockSite
            .Setup(s => s.GetService(typeof(ISelectionService)))
            .Returns(mockSelectionService.Object)
            .Verifiable();
        mockSite
            .Setup(s => s.GetService(typeof(IExtenderListService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(IDictionaryService)))
            .Returns(null);
        mockSite
            .Setup(s => s.GetService(typeof(ITypeDescriptorFilterService)))
            .Returns(null);
        mockSite
            .Setup(s => s.Name)
            .Returns("Name");
        control.Site = mockSite.Object;
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        control.InvokeEditMode();
        Assert.Equal(expectedSelectionStyle, control.SelectionStyle);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(3));
        mockSelectionService.Verify(s => s.GetComponentSelected(control), Times.Exactly(2));

        // Call again.
        control.InvokeEditMode();
        Assert.Equal(expectedSelectionStyle, control.SelectionStyle);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
        mockSite.Verify(s => s.GetService(typeof(ISelectionService)), Times.Exactly(3));
        mockSelectionService.Verify(s => s.GetComponentSelected(control), Times.Exactly(2));
    }

    [WinFormsTheory]
    [NewAndDefaultData<EventArgs>]
    public void AxHost_OnEnter_Invoke_CallsEnter(EventArgs eventArgs)
    {
        using SubAxHost control = new(EmptyClsidString);
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(eventArgs, e);
            callCount++;
        };

        // Call with handler.
        control.Enter += handler;
        control.OnEnter(eventArgs);
        Assert.Equal(1, callCount);

        // Remove handler.
        control.Enter -= handler;
        control.OnEnter(eventArgs);
        Assert.Equal(1, callCount);
    }

    [WinFormsTheory]
    [CommonMemberData(typeof(CommonTestHelperEx), nameof(CommonTestHelperEx.GetKeyEventArgsTheoryData))]
    public void AxHost_OnLeave_Invoke_CallsLeave(KeyEventArgs eventArgs)
    {
        using SubAxHost control = new(EmptyClsidString);
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(eventArgs, e);
            callCount++;
        };

        // Call with handler.
        control.Leave += handler;
        control.OnLeave(eventArgs);
        Assert.Equal(1, callCount);

        // Remove handler.
        control.Leave -= handler;
        control.OnLeave(eventArgs);
        Assert.Equal(1, callCount);
    }

    [WinFormsTheory]
    [NewAndDefaultData<EventArgs>]
    public void AxHost_OnMouseCaptureChanged_Invoke_CallsMouseCaptureChanged(EventArgs eventArgs)
    {
        using SubAxHost control = new(EmptyClsidString);
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(eventArgs, e);
            callCount++;
        };

        // Call with handler.
        control.MouseCaptureChanged += handler;
        control.OnMouseCaptureChanged(eventArgs);
        Assert.Equal(1, callCount);

        // Remove handler.
        control.MouseCaptureChanged -= handler;
        control.OnMouseCaptureChanged(eventArgs);
        Assert.Equal(1, callCount);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetAttributes_Invoke_ReturnsExpected()
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        AttributeCollection attributes = customTypeDescriptor.GetAttributes();
        Assert.NotNull(attributes[typeof(CustomAttribute)]);
        Assert.False(control.IsHandleCreated);

        // Call again.
        attributes = customTypeDescriptor.GetAttributes();
        Assert.NotNull(attributes[typeof(CustomAttribute)]);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetAttributes_InvokeWithHandle_ReturnsExpected()
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        AttributeCollection attributes = customTypeDescriptor.GetAttributes();
        Assert.NotNull(attributes[typeof(CustomAttribute)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        attributes = customTypeDescriptor.GetAttributes();
        Assert.NotNull(attributes[typeof(CustomAttribute)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetClassName_Invoke_ReturnsExpected()
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        Assert.Null(customTypeDescriptor.GetClassName());
        Assert.False(control.IsHandleCreated);

        // Call again.
        Assert.Null(customTypeDescriptor.GetClassName());
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetClassName_InvokeWithHandle_ReturnsExpected()
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        Assert.Null(customTypeDescriptor.GetClassName());
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        Assert.Null(customTypeDescriptor.GetClassName());
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetComponentName_Invoke_ReturnsExpected()
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        Assert.Null(customTypeDescriptor.GetComponentName());
        Assert.False(control.IsHandleCreated);

        // Call again.
        Assert.Null(customTypeDescriptor.GetComponentName());
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetComponentName_InvokeWithHandle_ReturnsExpected()
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        Assert.Null(customTypeDescriptor.GetComponentName());
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        Assert.Null(customTypeDescriptor.GetComponentName());
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetConverter_Invoke_ReturnsExpected()
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        Assert.Null(customTypeDescriptor.GetConverter());
        Assert.False(control.IsHandleCreated);

        // Call again.
        Assert.Null(customTypeDescriptor.GetConverter());
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetConverter_InvokeWithHandle_ReturnsExpected()
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        Assert.Null(customTypeDescriptor.GetConverter());
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        Assert.Null(customTypeDescriptor.GetConverter());
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetDefaultEvent_Invoke_ReturnsExpected()
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        EventDescriptor eventDescriptor = customTypeDescriptor.GetDefaultEvent();
        Assert.Equal(nameof(AxHost.Enter), eventDescriptor.Name);
        Assert.False(control.IsHandleCreated);

        // Call again.
        eventDescriptor = customTypeDescriptor.GetDefaultEvent();
        Assert.Equal(nameof(AxHost.Enter), eventDescriptor.Name);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetDefaultEvent_InvokeWithHandle_ReturnsExpected()
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        EventDescriptor eventDescriptor = customTypeDescriptor.GetDefaultEvent();
        Assert.Equal(nameof(AxHost.Enter), eventDescriptor.Name);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        eventDescriptor = customTypeDescriptor.GetDefaultEvent();
        Assert.Equal(nameof(AxHost.Enter), eventDescriptor.Name);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetDefaultProperty_Invoke_ReturnsExpected()
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        PropertyDescriptor propertyDescriptor = customTypeDescriptor.GetDefaultProperty();
        Assert.Equal(nameof(AxHost.Text), propertyDescriptor.Name);
        Assert.False(control.IsHandleCreated);

        // Call again.
        propertyDescriptor = customTypeDescriptor.GetDefaultProperty();
        Assert.Equal(nameof(AxHost.Text), propertyDescriptor.Name);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetDefaultProperty_InvokeWithHandle_ReturnsExpected()
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        PropertyDescriptor propertyDescriptor = customTypeDescriptor.GetDefaultProperty();
        Assert.Equal(nameof(AxHost.Text), propertyDescriptor.Name);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        propertyDescriptor = customTypeDescriptor.GetDefaultProperty();
        Assert.Equal(nameof(AxHost.Text), propertyDescriptor.Name);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsTheory]
    [InlineData(null)]
    [InlineData(typeof(int))]
    [InlineData(typeof(ComponentEditor))]
    [InlineData(typeof(SubComponentEditor))]
    public void AxHost_ICustomTypeDescriptorGetEditor_typeInvoke_ReturnsExpected(Type editorBaseType)
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        Assert.Null(customTypeDescriptor.GetEditor(editorBaseType));
        Assert.False(control.IsHandleCreated);

        // Call again.
        Assert.Null(customTypeDescriptor.GetEditor(editorBaseType));
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [InlineData(null)]
    [InlineData(typeof(int))]
    [InlineData(typeof(ComponentEditor))]
    [InlineData(typeof(SubComponentEditor))]
    public void AxHost_ICustomTypeDescriptorGetEditor_typeInvokeWithHandle_ReturnsExpected(Type editorBaseType)
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        Assert.Null(customTypeDescriptor.GetEditor(editorBaseType));
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        Assert.Null(customTypeDescriptor.GetEditor(editorBaseType));
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetEvents_Invoke_ReturnsExpected()
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        EventDescriptorCollection events = customTypeDescriptor.GetEvents();
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.False(control.IsHandleCreated);

        // Call again.
        events = customTypeDescriptor.GetEvents();
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetEvents_InvokeWithHandle_ReturnsExpected()
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        EventDescriptorCollection events = customTypeDescriptor.GetEvents();
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        events = customTypeDescriptor.GetEvents();
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    public static IEnumerable<object[]> GetEvents_AttributeArray_TestData()
    {
        yield return new object[] { null };
        yield return new object[] { Array.Empty<Attribute>() };
        yield return new object[] { new Attribute[] { null } };
    }

    [WinFormsTheory]
    [MemberData(nameof(GetEvents_AttributeArray_TestData))]
    public void AxHost_ICustomTypeDescriptorGetEvents_InvokeAttributeArray_ReturnsExpected(Attribute[] attributes)
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        EventDescriptorCollection events = customTypeDescriptor.GetEvents(attributes);
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.False(control.IsHandleCreated);

        // Call again.
        events = customTypeDescriptor.GetEvents(attributes);
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [MemberData(nameof(GetEvents_AttributeArray_TestData))]
    public void AxHost_ICustomTypeDescriptorGetEvents_InvokeAttributeArrayWithHandle_ReturnsExpected(Attribute[] attributes)
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        EventDescriptorCollection events = customTypeDescriptor.GetEvents(attributes);
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        events = customTypeDescriptor.GetEvents(attributes);
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetEvents_InvokeAttributeArrayCustom_ReturnsExpected()
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        EventDescriptorCollection events = customTypeDescriptor.GetEvents([new CustomAttribute()]);
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.False(control.IsHandleCreated);

        // Call again.
        events = customTypeDescriptor.GetEvents([new CustomAttribute()]);
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetEvents_InvokeAttributeArrayCustomWithHandle_ReturnsExpected()
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        EventDescriptorCollection events = customTypeDescriptor.GetEvents([new CustomAttribute()]);
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        events = customTypeDescriptor.GetEvents([new CustomAttribute()]);
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetEvents_InvokeAttributeArrayNoSuch_ReturnsExpected()
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        EventDescriptorCollection events = customTypeDescriptor.GetEvents([new NoSuchAttribute()]);
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.False(control.IsHandleCreated);

        // Call again.
        events = customTypeDescriptor.GetEvents([new NoSuchAttribute()]);
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetEvents_InvokeAttributeArrayNoSuchWithHandle_ReturnsExpected()
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        EventDescriptorCollection events = customTypeDescriptor.GetEvents([new NoSuchAttribute()]);
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        events = customTypeDescriptor.GetEvents([new NoSuchAttribute()]);
        Assert.True(events.Count > 1);
        Assert.NotNull(events[nameof(CustomAxHost.CustomEvent)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetProperties_Invoke_ReturnsExpected()
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        PropertyDescriptorCollection events = customTypeDescriptor.GetProperties();
        Assert.NotNull(events[nameof(CustomAxHost.CustomProperty)]);
        Assert.False(control.IsHandleCreated);

        // Call again.
        events = customTypeDescriptor.GetProperties();
        Assert.NotNull(events[nameof(CustomAxHost.CustomProperty)]);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetProperties_InvokeWithHandle_ReturnsExpected()
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        PropertyDescriptorCollection events = customTypeDescriptor.GetProperties();
        Assert.NotNull(events[nameof(CustomAxHost.CustomProperty)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        events = customTypeDescriptor.GetProperties();
        Assert.NotNull(events[nameof(CustomAxHost.CustomProperty)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    public static IEnumerable<object[]> GetProperties_AttributeArray_TestData()
    {
        yield return new object[] { null };
        yield return new object[] { Array.Empty<Attribute>() };
#if false
        yield return new object[] { new Attribute[] { null } };
#endif
    }

    [WinFormsTheory]
    [MemberData(nameof(GetProperties_AttributeArray_TestData))]
    public void AxHost_ICustomTypeDescriptorGetProperties_InvokeAttributeArray_ReturnsExpected(Attribute[] attributes)
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        PropertyDescriptorCollection properties = customTypeDescriptor.GetProperties(attributes);
        Assert.True(properties.Count > 1);
        Assert.NotNull(properties[nameof(CustomAxHost.CustomProperty)]);
        Assert.False(control.IsHandleCreated);

        // Call again.
        properties = customTypeDescriptor.GetProperties(attributes);
        Assert.True(properties.Count > 1);
        Assert.NotNull(properties[nameof(CustomAxHost.CustomProperty)]);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [MemberData(nameof(GetProperties_AttributeArray_TestData))]
    public void AxHost_ICustomTypeDescriptorGetProperties_InvokeAttributeArrayWithHandle_ReturnsExpected(Attribute[] attributes)
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        PropertyDescriptorCollection properties = customTypeDescriptor.GetProperties(attributes);
        Assert.True(properties.Count > 1);
        Assert.NotNull(properties[nameof(CustomAxHost.CustomProperty)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        properties = customTypeDescriptor.GetProperties(attributes);
        Assert.True(properties.Count > 1);
        Assert.NotNull(properties[nameof(CustomAxHost.CustomProperty)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetProperties_InvokeAttributeArrayCustom_ReturnsExpected()
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        PropertyDescriptorCollection properties = customTypeDescriptor.GetProperties([new CustomAttribute()]);
        Assert.True(properties.Count > 1);
        Assert.NotNull(properties[nameof(CustomAxHost.CustomProperty)]);
        Assert.False(control.IsHandleCreated);

        // Call again.
        properties = customTypeDescriptor.GetProperties([new CustomAttribute()]);
        Assert.True(properties.Count > 1);
        Assert.NotNull(properties[nameof(CustomAxHost.CustomProperty)]);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetProperties_InvokeAttributeArrayCustomWithHandle_ReturnsExpected()
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        PropertyDescriptorCollection properties = customTypeDescriptor.GetProperties([new CustomAttribute()]);
        Assert.True(properties.Count > 1);
        Assert.NotNull(properties[nameof(CustomAxHost.CustomProperty)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        properties = customTypeDescriptor.GetProperties([new CustomAttribute()]);
        Assert.True(properties.Count > 1);
        Assert.NotNull(properties[nameof(CustomAxHost.CustomProperty)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetProperties_InvokeAttributeArrayNoSuch_ReturnsExpected()
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        PropertyDescriptorCollection properties = customTypeDescriptor.GetProperties([new NoSuchAttribute()]);
        Assert.True(properties.Count > 1);
        Assert.NotNull(properties[nameof(CustomAxHost.CustomProperty)]);
        Assert.False(control.IsHandleCreated);

        // Call again.
        properties = customTypeDescriptor.GetProperties([new NoSuchAttribute()]);
        Assert.True(properties.Count > 1);
        Assert.NotNull(properties[nameof(CustomAxHost.CustomProperty)]);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void AxHost_ICustomTypeDescriptorGetProperties_InvokeAttributeArrayNoSuchWithHandle_ReturnsExpected()
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        PropertyDescriptorCollection properties = customTypeDescriptor.GetProperties([new NoSuchAttribute()]);
        Assert.True(properties.Count > 1);
        Assert.NotNull(properties[nameof(CustomAxHost.CustomProperty)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        properties = customTypeDescriptor.GetProperties([new NoSuchAttribute()]);
        Assert.True(properties.Count > 1);
        Assert.NotNull(properties[nameof(CustomAxHost.CustomProperty)]);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    public static IEnumerable<object[]> GetPropertyOwner_TestData()
    {
        yield return new object[] { null };

        PropertyDescriptor descriptor = TypeDescriptor.GetProperties(typeof(string))[nameof(string.Length)];
        yield return new object[] { descriptor };
    }

    [WinFormsTheory]
    [MemberData(nameof(GetPropertyOwner_TestData))]
    public void AxHost_ICustomTypeDescriptorGetPropertyOwner_Invoke_ReturnsExpected(PropertyDescriptor pd)
    {
        using CustomAxHost control = new(EmptyClsidString);
        ICustomTypeDescriptor customTypeDescriptor = control;
        Assert.Same(control, customTypeDescriptor.GetPropertyOwner(pd));
        Assert.False(control.IsHandleCreated);

        // Call again.
        Assert.Same(control, customTypeDescriptor.GetPropertyOwner(pd));
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [MemberData(nameof(GetPropertyOwner_TestData))]
    public void AxHost_ICustomTypeDescriptorGetPropertyOwner_InvokeWithHandle_ReturnsExpected(PropertyDescriptor pd)
    {
        using CustomAxHost control = new(WebBrowserClsidString);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        ((Control)control).StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        ICustomTypeDescriptor customTypeDescriptor = control;
        Assert.Same(control, customTypeDescriptor.GetPropertyOwner(pd));
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Call again.
        Assert.Same(control, customTypeDescriptor.GetPropertyOwner(pd));
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public unsafe void AxHost_Ocx_Dispose_Success()
    {
        SubAxHost control = new(WebBrowserClsidString);
        control.CreateControl();
        using var ocx = ComHelpers.GetComScope<IUnknown>(control.GetOcx());

        control.Dispose();
        ocx.Value->AddRef();
        (ocx.Value->Release() - 1).Should().Be(0);
    }

    [WinFormsFact]
    public unsafe void AxHost_Ocx_ConnectionPoint_Success()
    {
        using SubAxHost control = new(WebBrowserClsidString);
        control.CreateControl();

        object site = control.TestAccessor.Dynamic._oleSite;
        AxHost.ConnectionPointCookie cookie = site.TestAccessor.Dynamic._connectionPoint;
        cookie.Should().NotBeNull();
        cookie.Connected.Should().BeTrue();
    }

    private class SubComponentEditor : ComponentEditor
    {
        public override bool EditComponent(ITypeDescriptorContext context, object component)
        {
            throw new NotImplementedException();
        }
    }

    [AttributeUsage(AttributeTargets.All)]
    private class CustomAttribute : Attribute
    {
    }

    [AttributeUsage(AttributeTargets.All)]
    private class NoSuchAttribute : Attribute
    {
    }

    [Custom]
    private class CustomAxHost : AxHost
    {
        public CustomAxHost(string clsid) : base(clsid)
        {
        }

        [Custom]
        public event EventHandler CustomEvent;

        [Custom]
        public string CustomProperty { get; set; }
    }

    private class InvalidSelectionStyleAxHost : AxHost
    {
        public InvalidSelectionStyleAxHost(string clsid) : base(clsid)
        {
        }

        public InvalidSelectionStyleAxHost(string clsid, int flags) : base(clsid, flags)
        {
        }

        public string SelectionStyle { get; set; }
    }

    private class ValidSelectionStyleAxHost : AxHost
    {
        public ValidSelectionStyleAxHost(string clsid) : base(clsid)
        {
        }

        public ValidSelectionStyleAxHost(string clsid, int flags) : base(clsid, flags)
        {
        }

        public int SelectionStyle { get; set; }
    }

    private class SubAxHost : AxHost
    {
        public SubAxHost(string clsid) : base(clsid)
        {
        }

        public SubAxHost(string clsid, int flags) : base(clsid, flags)
        {
        }

        public new bool CanEnableIme => base.CanEnableIme;

        public new bool CanRaiseEvents => base.CanRaiseEvents;

        public new CreateParams CreateParams => base.CreateParams;

        public new Cursor DefaultCursor => base.DefaultCursor;

        public new ImeMode DefaultImeMode => base.DefaultImeMode;

        public new Padding DefaultMargin => base.DefaultMargin;

        public new Size DefaultMaximumSize => base.DefaultMaximumSize;

        public new Size DefaultMinimumSize => base.DefaultMinimumSize;

        public new Padding DefaultPadding => base.DefaultPadding;

        public new Size DefaultSize => base.DefaultSize;

        public new bool DesignMode => base.DesignMode;

        public new bool DoubleBuffered
        {
            get => base.DoubleBuffered;
            set => base.DoubleBuffered = value;
        }

        public new EventHandlerList Events => base.Events;

        public new int FontHeight
        {
            get => base.FontHeight;
            set => base.FontHeight = value;
        }

        public new ImeMode ImeModeBase
        {
            get => base.ImeModeBase;
            set => base.ImeModeBase = value;
        }

        public new bool ResizeRedraw
        {
            get => base.ResizeRedraw;
            set => base.ResizeRedraw = value;
        }

        public new bool ShowFocusCues => base.ShowFocusCues;

        public new bool ShowKeyboardCues => base.ShowKeyboardCues;

        public new void AttachInterfaces() => base.AttachInterfaces();

        public new void CreateSink() => base.CreateSink();

        public new void DetachSink() => base.DetachSink();

        public static new Font GetFontFromIFont(object font) => AxHost.GetFontFromIFont(font);

        public static new object GetIFontDispFromFont(Font font) => AxHost.GetIFontDispFromFont(font);

        public static new object GetIFontFromFont(Font font) => AxHost.GetIFontFromFont(font);

        public static new object GetIPictureFromCursor(Cursor cursor) => AxHost.GetIPictureFromCursor(cursor);

        public static new object GetIPictureDispFromPicture(Image image) => AxHost.GetIPictureDispFromPicture(image);

        public static new object GetIPictureFromPicture(Image image) => AxHost.GetIPictureFromPicture(image);

        public static new Image GetPictureFromIPicture(object picture) => AxHost.GetPictureFromIPicture(picture);

        public static new Image GetPictureFromIPictureDisp(object picture) => AxHost.GetPictureFromIPictureDisp(picture);

        public new void OnEnter(EventArgs e) => base.OnEnter(e);

        public new void OnLeave(EventArgs e) => base.OnLeave(e);

        public new void OnMouseCaptureChanged(EventArgs e) => base.OnMouseCaptureChanged(e);
    }
}
