There was only one sample/fixed lowercase test, as well as in JS; rn it's fixed

Actually there ARE random tests in Crystal, but they were in the sample test section, while the actual sampl tests were in actual section, tl;dr the author just messed them up while uploading the original Crystal fork. That happens XD

anyways, corrected that, now the problem is resolved~

added as an edit to kata since it's too minor for a separate fork

Removed lowercase letters in Ruby, done in this fork

Fixed.

Fixed, now all tests are guaranteed to have uppercase

the funniest thing is that the only lowercase test; all random tests are using uppercase

Works in C#10, but can't seem to find Assert.AreEqual() in C#12.

Ruby 3.0 enabled in this fork

Ruby 3.0 enabled in this fork

условие очень краткое и не совсем понятное, трудновато решалось, но я смог, хоть и нерациональным методом

you are misunderstanding the description.

equal to "alligator" (case-insensitive)

means "alLiGaToR", "ALLIGATOR", etc., are all valid. if it was case-sensitive, only "alligator" would be valid.

In JavaScript case "alligator" is case sensitive, the instructions are misleading.

Fixed.