require_relative '../../spec_helper'
require_relative 'fixtures/classes'

describe "Module#remove_class_variable" do
  it "removes class variable" do
    m = ModuleSpecs::MVars.dup
    m.send(:remove_class_variable, :@@mvar)
    m.class_variable_defined?(:@@mvar).should == false
  end

  it "returns the value of removing class variable" do
    m = ModuleSpecs::MVars.dup
    m.send(:remove_class_variable, :@@mvar).should == :mvar
  end

  it "removes a class variable defined in a metaclass" do
    obj = mock("metaclass class variable")
    meta = obj.singleton_class
    meta.send :class_variable_set, :@@var, 1
    meta.send(:remove_class_variable, :@@var).should == 1
    meta.class_variable_defined?(:@@var).should == false
  end

  it "raises a NameError when removing class variable declared in included module" do
    c = ModuleSpecs::RemoveClassVariable.new { include ModuleSpecs::MVars.dup }
    -> { c.send(:remove_class_variable, :@@mvar) }.should.raise(NameError)
  end

  it "raises a NameError when passed a symbol with one leading @" do
    -> { ModuleSpecs::MVars.send(:remove_class_variable, :@mvar) }.should.raise(NameError)
  end

  it "raises a NameError when passed a symbol with no leading @" do
    -> { ModuleSpecs::MVars.send(:remove_class_variable, :mvar)  }.should.raise(NameError)
  end

  it "raises a NameError when an uninitialized class variable is given" do
    -> { ModuleSpecs::MVars.send(:remove_class_variable, :@@nonexisting_class_variable) }.should.raise(NameError)
  end

  it "is public" do
    Module.private_instance_methods(true).should_not.include?(:remove_class_variable)
  end
end
