2018-03-04 10:09:32 -05:00
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require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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2017-05-07 08:04:49 -04:00
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describe "Array#&" do
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it "creates an array with elements common to both arrays (intersection)" do
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([] & []).should == []
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([1, 2] & []).should == []
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([] & [1, 2]).should == []
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([ 1, 3, 5 ] & [ 1, 2, 3 ]).should == [1, 3]
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end
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it "creates an array with no duplicates" do
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([ 1, 1, 3, 5 ] & [ 1, 2, 3 ]).uniq!.should == nil
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end
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it "creates an array with elements in order they are first encountered" do
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([ 1, 2, 3, 2, 5 ] & [ 5, 2, 3, 4 ]).should == [2, 3, 5]
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end
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it "does not modify the original Array" do
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a = [1, 1, 3, 5]
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(a & [1, 2, 3]).should == [1, 3]
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a.should == [1, 1, 3, 5]
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end
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it "properly handles recursive arrays" do
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empty = ArraySpecs.empty_recursive_array
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(empty & empty).should == empty
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(ArraySpecs.recursive_array & []).should == []
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([] & ArraySpecs.recursive_array).should == []
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(ArraySpecs.recursive_array & ArraySpecs.recursive_array).should == [1, 'two', 3.0, ArraySpecs.recursive_array]
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end
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it "tries to convert the passed argument to an Array using #to_ary" do
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obj = mock('[1,2,3]')
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obj.should_receive(:to_ary).and_return([1, 2, 3])
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([1, 2] & obj).should == ([1, 2])
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end
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it "determines equivalence between elements in the sense of eql?" do
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not_supported_on :opal do
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([5.0, 4.0] & [5, 4]).should == []
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end
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str = "x"
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([str] & [str.dup]).should == [str]
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obj1 = mock('1')
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obj2 = mock('2')
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2017-09-29 03:43:22 -04:00
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obj1.stub!(:hash).and_return(0)
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obj2.stub!(:hash).and_return(0)
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obj1.should_receive(:eql?).at_least(1).and_return(true)
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obj2.stub!(:eql?).and_return(true)
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([obj1] & [obj2]).should == [obj1]
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([obj1, obj1, obj2, obj2] & [obj2]).should == [obj1]
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obj1 = mock('3')
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obj2 = mock('4')
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obj1.stub!(:hash).and_return(0)
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obj2.stub!(:hash).and_return(0)
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obj1.should_receive(:eql?).at_least(1).and_return(false)
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([obj1] & [obj2]).should == []
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([obj1, obj1, obj2, obj2] & [obj2]).should == [obj2]
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end
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it "does return subclass instances for Array subclasses" do
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(ArraySpecs::MyArray[1, 2, 3] & []).should be_an_instance_of(Array)
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(ArraySpecs::MyArray[1, 2, 3] & ArraySpecs::MyArray[1, 2, 3]).should be_an_instance_of(Array)
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([] & ArraySpecs::MyArray[1, 2, 3]).should be_an_instance_of(Array)
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end
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it "does not call to_ary on array subclasses" do
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([5, 6] & ArraySpecs::ToAryArray[1, 2, 5, 6]).should == [5, 6]
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end
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it "properly handles an identical item even when its #eql? isn't reflexive" do
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x = mock('x')
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x.stub!(:hash).and_return(42)
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x.stub!(:eql?).and_return(false) # Stubbed for clarity and latitude in implementation; not actually sent by MRI.
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([x] & [x]).should == [x]
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end
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end
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