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describe :array_intersection, shared: true do
it "creates an array with elements common to both arrays (intersection)" do
[].send(@method, []).should == []
[1, 2].send(@method, []).should == []
[].send(@method, [1, 2]).should == []
[ 1, 3, 5 ].send(@method, [ 1, 2, 3 ]).should == [1, 3]
end
it "creates an array with no duplicates" do
[ 1, 1, 3, 5 ].send(@method, [ 1, 2, 3 ]).uniq!.should == nil
end
it "creates an array with elements in order they are first encountered" do
[ 1, 2, 3, 2, 5 ].send(@method, [ 5, 2, 3, 4 ]).should == [2, 3, 5]
end
it "does not modify the original Array" do
a = [1, 1, 3, 5]
a.send(@method, [1, 2, 3]).should == [1, 3]
a.should == [1, 1, 3, 5]
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
empty.send(@method, empty).should == empty
ArraySpecs.recursive_array.send(@method, []).should == []
[].send(@method, ArraySpecs.recursive_array).should == []
ArraySpecs.recursive_array.send(@method, ArraySpecs.recursive_array).should == [1, 'two', 3.0, ArraySpecs.recursive_array]
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].send(@method, obj).should == ([1, 2])
end
it "determines equivalence between elements in the sense of eql?" do
not_supported_on :opal do
[5.0, 4.0].send(@method, [5, 4]).should == []
end
str = "x"
[str].send(@method, [str.dup]).should == [str]
obj1 = mock('1')
obj2 = mock('2')
obj1.stub!(:hash).and_return(0)
obj2.stub!(:hash).and_return(0)
obj1.should_receive(:eql?).at_least(1).and_return(true)
obj2.stub!(:eql?).and_return(true)
[obj1].send(@method, [obj2]).should == [obj1]
[obj1, obj1, obj2, obj2].send(@method, [obj2]).should == [obj1]
obj1 = mock('3')
obj2 = mock('4')
obj1.stub!(:hash).and_return(0)
obj2.stub!(:hash).and_return(0)
obj1.should_receive(:eql?).at_least(1).and_return(false)
[obj1].send(@method, [obj2]).should == []
[obj1, obj1, obj2, obj2].send(@method, [obj2]).should == [obj2]
end
it "does return subclass instances for Array subclasses" do
ArraySpecs::MyArray[1, 2, 3].send(@method, []).should be_an_instance_of(Array)
ArraySpecs::MyArray[1, 2, 3].send(@method, ArraySpecs::MyArray[1, 2, 3]).should be_an_instance_of(Array)
[].send(@method, ArraySpecs::MyArray[1, 2, 3]).should be_an_instance_of(Array)
end
it "does not call to_ary on array subclasses" do
[5, 6].send(@method, ArraySpecs::ToAryArray[1, 2, 5, 6]).should == [5, 6]
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].send(@method, [x]).should == [x]
end
end
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