Tools to learn/teach Unit Test design?

@gpaciga recently asked

I’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. I’m aware of repl.it, but I don’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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