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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Array#+" do
it "concatenates two arrays" do
([ 1, 2, 3 ] + [ 3, 4, 5 ]).should == [1, 2, 3, 3, 4, 5]
([ 1, 2, 3 ] + []).should == [1, 2, 3]
([] + [ 1, 2, 3 ]).should == [1, 2, 3]
([] + []).should == []
end
it "can concatenate an array with itself" do
ary = [1, 2, 3]
(ary + ary).should == [1, 2, 3, 1, 2, 3]
end
describe "converts the passed argument to an Array using #to_ary" do
it "successfully concatenates the resulting array from the #to_ary call" do
obj = mock('["x", "y"]')
obj.should_receive(:to_ary).and_return(["x", "y"])
([1, 2, 3] + obj).should == [1, 2, 3, "x", "y"]
end
it "raises a Typeerror if the given argument can't be converted to an array" do
-> { [1, 2, 3] + nil }.should raise_error(TypeError)
-> { [1, 2, 3] + "abc" }.should raise_error(TypeError)
end
it "raises a NoMethodError if the given argument raises a NoMethodError during type coercion to an Array" do
obj = mock("hello")
obj.should_receive(:to_ary).and_raise(NoMethodError)
-> { [1, 2, 3] + obj }.should raise_error(NoMethodError)
end
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
(empty + empty).should == [empty, empty]
array = ArraySpecs.recursive_array
(empty + array).should == [empty, 1, 'two', 3.0, array, array, array, array, array]
(array + array).should == [
1, 'two', 3.0, array, array, array, array, array,
1, 'two', 3.0, array, array, array, array, array]
end
it "does return subclass instances with Array subclasses" do
(ArraySpecs::MyArray[1, 2, 3] + []).should be_an_instance_of(Array)
(ArraySpecs::MyArray[1, 2, 3] + ArraySpecs::MyArray[]).should be_an_instance_of(Array)
([1, 2, 3] + ArraySpecs::MyArray[]).should be_an_instance_of(Array)
end
it "does not call to_ary on array subclasses" do
([5, 6] + ArraySpecs::ToAryArray[1, 2]).should == [5, 6, 1, 2]
end
end
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