Tools to learn/teach Unit Test design?

@gpaciga recently asked

Iโ€™m thinking of putting together some unit test design exercises. Does anybody know of an online tool that can act as a REPL with a function already defined, so the user can call the function with different arguments to see what happens? Just javascript is fine, though other languages would be nice. Iโ€™m aware of repl.it, but I donโ€™t want the function itself to be visible/editable.

Someone else offered

I used https://exercism.io/ with my team at work, but it is more the reverse - the tests are defined and you need to complete the function under test.

Do you have any other tools or resources to help with teaching unit test design?

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