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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Array#transpose" do
it "assumes an array of arrays and returns the result of transposing rows and columns" do
[[1, 'a'], [2, 'b'], [3, 'c']].transpose.should == [[1, 2, 3], ["a", "b", "c"]]
[[1, 2, 3], ["a", "b", "c"]].transpose.should == [[1, 'a'], [2, 'b'], [3, 'c']]
[].transpose.should == []
[[]].transpose.should == []
[[], []].transpose.should == []
[[0]].transpose.should == [[0]]
[[0], [1]].transpose.should == [[0, 1]]
end
it "tries to convert the passed argument to an Array using #to_ary" do
obj = mock('[1,2]')
obj.should_receive(:to_ary).and_return([1, 2])
[obj, [:a, :b]].transpose.should == [[1, :a], [2, :b]]
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
empty.transpose.should == empty
a = []; a << a
b = []; b << b
[a, b].transpose.should == [[a, b]]
a = [1]; a << a
b = [2]; b << b
[a, b].transpose.should == [ [1, 2], [a, b] ]
end
it "raises a TypeError if the passed Argument does not respond to #to_ary" do
lambda { [Object.new, [:a, :b]].transpose }.should raise_error(TypeError)
end
it "does not call to_ary on array subclass elements" do
ary = [ArraySpecs::ToAryArray[1, 2], ArraySpecs::ToAryArray[4, 6]]
ary.transpose.should == [[1, 4], [2, 6]]
end
it "raises an IndexError if the arrays are not of the same length" do
lambda { [[1, 2], [:a]].transpose }.should raise_error(IndexError)
end
it "does not return subclass instance on Array subclasses" do
result = ArraySpecs::MyArray[ArraySpecs::MyArray[1, 2, 3], ArraySpecs::MyArray[4, 5, 6]].transpose
result.should be_an_instance_of(Array)
result[0].should be_an_instance_of(Array)
result[1].should be_an_instance_of(Array)
end
end
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