I improved the random tests and the solution passes now.

Ok, sincere apologies, you were correct, I reopened the issue at the top of the page. the tests are indeed using reflection, i dont know why your code is failing

okay, i checked your code, you made the same mistake as me initially, rollback() has to support the entire history of versions, not just the last one. i think the description should make this clearer

please tag this as a question, not an issue. it is very likely that the error comes from your code, not the tests suite, as 160+ people passed the Java version without complaints. are you making sure that your methods are chainable ?

Yes, at least on Ruby. Well, it’s not so difficult, it’s more about attentiveness, the main thing is not to get confused in the code.

That test expects false, not true

 a1 = intArrayOf(121, 144, 19, 161, 19, 144, 19, 11)
 a2 = intArrayOf(11*11, 121*121, 144*144, 190*190, 161*161, 19*19, 144*144, 19*19)
 assertEquals(false, comp(a1, a2))

Kotlin Completions 651

Thanks for the translation.

My original Java Kata also included a random2 test. Please add that.

  // This method more realistic numbers from the real Pony Express
  // 184 stations
  // distance between them 5-25 miles
  public void random2() {
  ...

Also input/output for all random tests same as the original Java, so that I can review it properly.

Thanks for the suggestions, I have incorporated them.