Sample tests are not strictly necessary to complete a kata, and authors are not strictly required to add them. Sample tests can be meant as just an initially blank playground for users training on a kata, without any initial test cases.

However, it's considered a good authoring practice to provide a small set of sample tests, or, at least, replace the initial template with something at least a little bit meaningful and related to the kata.

I'm sorry, but there are no tests for JavaScript version of this kata.
Do we have to write it ourselves (which is frankly not as bad as it sounds, but still)?