require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require_relative 'shared/enumerable_enumeratorized'
require_relative 'shared/value_packing'

describe "Enumerable#take_while" do
  describe "value packing of source yields" do
    before :each do
      @take = -> e { e.take_while { true } }
    end
    it_behaves_like :enumerable_value_packing, nil
  end

  before :each do
    @enum = EnumerableSpecs::Numerous.new(3, 2, 1, :go)
  end

  it "returns an Enumerator if no block given" do
    @enum.take_while.should.instance_of?(Enumerator)
  end

  it "returns no/all elements for {true/false} block" do
    @enum.take_while{true}.should == @enum.to_a
    @enum.take_while{false}.should == []
  end

  it "accepts returns other than true/false" do
    @enum.take_while{1}.should == @enum.to_a
    @enum.take_while{nil}.should == []
  end

  it "passes elements to the block until the first false" do
    a = []
    @enum.take_while{|obj| (a << obj).size < 3}.should == [3, 2]
    a.should == [3, 2, 1]
  end

  it "will only go through what's needed" do
    enum = EnumerableSpecs::EachCounter.new(4, 3, 2, 1, :stop)
    enum.take_while { |x|
      break 42 if x == 3
      true
    }.should == 42
    enum.times_yielded.should == 2
  end

  it "doesn't return self when it could" do
    a = [1,2,3]
    a.take_while{true}.should_not.equal?(a)
  end

  it "calls the block with initial args when yielded with multiple arguments" do
    yields = []
    EnumerableSpecs::YieldsMixed.new.take_while{ |v| yields << v }
    yields.should == [1, [2], 3, 5, [8, 9], nil, []]
  end

  it_behaves_like :enumerable_enumeratorized_with_unknown_size, :take_while
end
