I like the katana, but i missed some information for the "rules of scoring". I'm not familiar with tennis sport itself, but thanks to the katana i searched for some more information about counting in tennis. Maybe it would be nice to enhance the rules with:
A fourth point win by a player decides the game for him if the player then has a lead of at least two points, i.e. after the scores 40:0, 40:15 and 40:30 (or vice versa). If the score is 40:40, it is called a deuce. The following point is called an advantage.

I would like to do this, is there a way I can import the completed kata solution? That way I could feed the random list into that and compare it with the user solution output.

Oh right I see, that situation should be in the tests now

I meant that there should be tests with one of the players having an extra deuce point, not 40 - 40...

Good idea, I have added one of those.

There're no tests where the game is in a deuce state after the whole array has been processed.

Thanks, resolved.

Sample tests are not using it blocks.

That should be resolved now

That should all be implemented now.

Thanks for the feedback. I will be adding that as soon as possible, that would definately make the kata more interesting

Deuce rules are not tested.

The output type should be dict[str, tuple[int, int]].

No random tests.

Tests are not using it blocks.