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Diffstat (limited to 'spec/rubyspec/core/array/zip_spec.rb')
-rw-r--r-- | spec/rubyspec/core/array/zip_spec.rb | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/spec/rubyspec/core/array/zip_spec.rb b/spec/rubyspec/core/array/zip_spec.rb new file mode 100644 index 0000000000..7aac13536b --- /dev/null +++ b/spec/rubyspec/core/array/zip_spec.rb @@ -0,0 +1,65 @@ +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 |