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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe 'Array#intersect?' do
describe 'when at least one element in two Arrays is the same' do
it 'returns true' do
[1, 2].intersect?([2, 3, 4]).should == true
[2, 3, 4].intersect?([1, 2]).should == true
end
end
describe 'when there are no elements in common between two Arrays' do
it 'returns false' do
[0, 1, 2].intersect?([3, 4]).should == false
[3, 4].intersect?([0, 1, 2]).should == false
[3, 4].intersect?([]).should == false
[].intersect?([0, 1, 2]).should == false
end
end
it "tries to convert the passed argument to an Array using #to_ary" do
obj = mock('[1,2,3]')
obj.should_receive(:to_ary).and_return([1, 2, 3])
[1, 2].intersect?(obj).should == true
end
it "determines equivalence between elements in the sense of eql?" do
obj1 = mock('1')
obj2 = mock('2')
obj1.stub!(:hash).and_return(0)
obj2.stub!(:hash).and_return(0)
obj1.stub!(:eql?).and_return(true)
obj2.stub!(:eql?).and_return(true)
[obj1].intersect?([obj2]).should == true
obj1 = mock('3')
obj2 = mock('4')
obj1.stub!(:hash).and_return(0)
obj2.stub!(:hash).and_return(0)
obj1.stub!(:eql?).and_return(false)
obj2.stub!(:eql?).and_return(false)
[obj1].intersect?([obj2]).should == false
end
it "does not call to_ary on array subclasses" do
[5, 6].intersect?(ArraySpecs::ToAryArray[1, 2, 5, 6]).should == true
end
it "properly handles an identical item even when its #eql? isn't reflexive" do
x = mock('x')
x.stub!(:hash).and_return(42)
x.stub!(:eql?).and_return(false) # Stubbed for clarity and latitude in implementation; not actually sent by MRI.
[x].intersect?([x]).should == true
end
it "has semantic of !(a & b).empty?" do
[].intersect?([]).should == false
[nil].intersect?([nil]).should == true
end
end
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