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describe :array_binary_difference, shared: true do
it "creates an array minus any items from other array" do
[].send(@method, [ 1, 2, 4 ]).should == []
[1, 2, 4].send(@method, []).should == [1, 2, 4]
[ 1, 2, 3, 4, 5 ].send(@method, [ 1, 2, 4 ]).should == [3, 5]
end
it "removes multiple items on the lhs equal to one on the rhs" do
[1, 1, 2, 2, 3, 3, 4, 5].send(@method, [1, 2, 4]).should == [3, 3, 5]
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
empty.send(@method, empty).should == []
[].send(@method, ArraySpecs.recursive_array).should == []
array = ArraySpecs.recursive_array
array.send(@method, array).should == []
end
it "tries to convert the passed arguments to Arrays using #to_ary" do
obj = mock('[2,3,3,4]')
obj.should_receive(:to_ary).and_return([2, 3, 3, 4])
[1, 1, 2, 2, 3, 4].send(@method, obj).should == [1, 1]
end
it "raises a TypeError if the argument cannot be coerced to an Array by calling #to_ary" do
obj = mock('not an array')
-> { [1, 2, 3].send(@method, obj) }.should raise_error(TypeError)
end
it "does not return subclass instance 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[]).should be_an_instance_of(Array)
[1, 2, 3].send(@method, ArraySpecs::MyArray[]).should be_an_instance_of(Array)
end
it "does not call to_ary on array subclasses" do
[5, 6, 7].send(@method, ArraySpecs::ToAryArray[7]).should == [5, 6]
end
it "removes an item identified as equivalent via #hash and #eql?" do
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)
[obj1].send(@method, [obj2]).should == []
[obj1, obj1, obj2, obj2].send(@method, [obj2]).should == []
end
it "doesn't remove an item with the same hash but not #eql?" do
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(false)
[obj1].send(@method, [obj2]).should == [obj1]
[obj1, obj1, obj2, obj2].send(@method, [obj2]).should == [obj1, obj1]
end
it "removes 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 == []
end
it "is not destructive" do
a = [1, 2, 3]
a.send(@method, [1])
a.should == [1, 2, 3]
end
end
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