The problem states that if the arguments are numbers then it can be assumed that neither will be 0. But I am getting a division by zero error in the random tests.

Traceback (most recent call last):
  File "/workspace/default/tests.py", line 22, in <module>
    test.assert_equals(my_first_kata(a,b),sol(a,b))
                       ^^^^^^^^^^^^^^^^^^
  File "/workspace/default/solution.py", line 5, in my_first_kata
    return a % b + b % a
           ~~^~~
ZeroDivisionError: integer modulo by zero

Thanks for that link - learned something new. Very interesting and helpful.

No sample tests for Ruby.

The initial public test that executes when clicking the test button is broken. Actually, it looks like a test for a completely different kata (it is trying to call an add method, so you will get a confusing error about there not being an add method).

To complete this kata, you have to skip pushing the test button and just click the attempt button instead.

This would fail for when the argument is "YX" though.

The compare function for this solution returns a boolean, not 1, -1, or 0, which is required for sort to work. So the sort here doesn't actually do anything. I am not sure how it passed the tests.

Note that although this works, this is not best practice as a new copy of the bark method will be created for each instance, rather than sharing a single instance of the bark method via inheritance. No inheritance is being utilized here. So it results in unnecessary extra memory usage.