I agree @diasjorge, that is annoying to have hash work fine for your own tests but not the authors. I've updated the preloaded code so that Hash is now crippled at all times.

I have read the description and so it seems many other people. The issue I see is that it is not clear.

It says "Thanks to shadchnev, I broke all of the methods from the Hash class."

Now for me that did not mean the same as: "The hash class is disabled for this exercise" nor it explains why it works for your own tests but not for kata ones.

Read the description. It specifically tells you hash is diabled for this exercise.

Because the creator of the kata has actively broken some methods of the hash class when "his/her" tests are run.

Why won't Hash work?? It works great in all my test cases. I'm using object.object_id to identify them.