I liked the kata and found "some" solution, not exzctly the optimal.
However, am I wrong if I understand the story that the input must contain only string of uppercase(s)?
Because the attempts tested also one other option...

Breaking on first failed test is a feature, not a bug. Other opinions may be available.

Rewriting a working test suite does not seem to be a priority. Closing.

I guess we'll never know. Closing.

approved

Haskell translation

This should be part of the description.

Nice kata, worth the time. Thanks to the author and those who contributed to it. one of the best 7 KYU kata which make you think.

nice kata

definitively !!!

All of the categories have to either be unique within their set or the same.

Iam a bit confused. Do all 4 categories have to be the same within each array or just 3 of them?

Ruby 3.0 should be enabled, read this to learn how to do it

Please organize the structure of test fixture as following (although it has been mentioned in the attached link, I'm repeated here again)

describe "<This message should describe the categories of test groups inside this block>" do
  it "<A short message describing this test group>" do
    expect(...).to eq(...) #Assertions
    #Or Test.assert_equals(user_response, reference_response)
  end
end

Good idea, added the tag!

Nice kata, thanks.
I would give this kata a Logic tag as well.