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#zip" do
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it "returns an array of arrays containing corresponding elements of each array" do
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[1, 2, 3, 4].zip(["a", "b", "c", "d", "e"]).should ==
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[[1, "a"], [2, "b"], [3, "c"], [4, "d"]]
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end
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it "fills in missing values with nil" do
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[1, 2, 3, 4, 5].zip(["a", "b", "c", "d"]).should ==
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[[1, "a"], [2, "b"], [3, "c"], [4, "d"], [5, nil]]
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end
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it "properly handles recursive arrays" do
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a = []; a << a
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b = [1]; b << b
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a.zip(a).should == [ [a[0], a[0]] ]
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a.zip(b).should == [ [a[0], b[0]] ]
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b.zip(a).should == [ [b[0], a[0]], [b[1], a[1]] ]
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b.zip(b).should == [ [b[0], b[0]], [b[1], b[1]] ]
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end
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it "calls #to_ary to convert the argument to an Array" do
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obj = mock('[3,4]')
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obj.should_receive(:to_ary).and_return([3, 4])
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[1, 2].zip(obj).should == [[1, 3], [2, 4]]
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end
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it "uses #each to extract arguments' elements when #to_ary fails" do
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obj = Class.new do
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def each(&b)
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[3,4].each(&b)
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end
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end.new
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[1, 2].zip(obj).should == [[1, 3], [2, 4]]
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end
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it "stops at own size when given an infinite enumerator" do
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[1, 2].zip(10.upto(Float::INFINITY)).should == [[1, 10], [2, 11]]
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end
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2019-02-07 11:35:33 -05:00
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it "fills nil when the given enumerator is shorter than self" do
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2017-05-07 08:04:49 -04:00
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obj = Object.new
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def obj.each
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yield 10
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end
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[1, 2].zip(obj).should == [[1, 10], [2, nil]]
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end
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it "calls block if supplied" do
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values = []
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[1, 2, 3, 4].zip(["a", "b", "c", "d", "e"]) { |value|
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values << value
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}.should == nil
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values.should == [[1, "a"], [2, "b"], [3, "c"], [4, "d"]]
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end
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it "does not return subclass instance on Array subclasses" do
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ArraySpecs::MyArray[1, 2, 3].zip(["a", "b"]).should be_an_instance_of(Array)
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end
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end
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