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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Array#&" do
it "creates an array with elements common to both arrays (intersection)" do
([] & []).should == []
([1, 2] & []).should == []
([] & [1, 2]).should == []
([ 1, 3, 5 ] & [ 1, 2, 3 ]).should == [1, 3]
end
it "creates an array with no duplicates" do
([ 1, 1, 3, 5 ] & [ 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 ] & [ 5, 2, 3, 4 ]).should == [2, 3, 5]
end
it "does not modify the original Array" do
a = [1, 1, 3, 5]
a & [1, 2, 3]
a.should == [1, 1, 3, 5]
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
(empty & empty).should == empty
(ArraySpecs.recursive_array & []).should == []
([] & ArraySpecs.recursive_array).should == []
(ArraySpecs.recursive_array & 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] & 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] & [5, 4]).should == []
end
str = "x"
([str] & [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.should_receive(:eql?).at_least(1).and_return(true)
([obj1] & [obj2]).should == [obj1]
([obj1, obj1, obj2, obj2] & [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] & [obj2]).should == []
([obj1, obj1, obj2, obj2] & [obj2]).should == [obj2]
end
it "does return subclass instances for Array subclasses" do
(ArraySpecs::MyArray[1, 2, 3] & []).should be_an_instance_of(Array)
(ArraySpecs::MyArray[1, 2, 3] & ArraySpecs::MyArray[1, 2, 3]).should be_an_instance_of(Array)
([] & ArraySpecs::MyArray[1, 2, 3]).should be_an_instance_of(Array)
end
it "does not call to_ary on array subclasses" do
([5, 6] & 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] & [x]).should == [x]
end
end
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