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