🚀 Feature: New repeat option to run tests an arbitrary number of times

[baileympearson]

Is your feature request related to a problem or a nice-to-have?? Please describe.
This is definitely a nice-to-have. Oftentimes, I'm debugging flakey tests or tests with race conditions and I want to see if I've fixed the flakiness. I usually approach this by running the test many times as an easy confirmation that the test is fixed. I usually just use a bash loop to run the test command numerous times but this has a few drawbacks

• Our test runner is slow-ish to start because of custom configuration we need to do (~4-5 seconds), so that dramatically increases the amount of time each test iteration takes (from milliseconds to 4-5 seconds per iteration)
• Our test runner prints out extra information, and mocha prints out test suite completion information as well, cluttering the test output visually. I usually solve this by either grepping for the test name in the output but it would be nice if I didn't need to do this. This also breaks down if I want to run multiple tests, not just one.
• Multiple tests are run in the order I don't expect because each iteration of the bash loop runs the full suite. I'd prefer each test to run however many times I specify (in order) before continuing to the next.

Describe the solution you'd like
A repeat option would solve this issue. The option would be numeric and default to one. When mocha executes a test, I envision mocha just looping and running the test however many times are specified.

Describe alternatives you've considered
I've tried the bash loop I mentioned in the description (I outlined some challenges there as well).

The other approach I've used is to wrap each test in a loop, but this breaks down if I'm using a --grep or I'm working with many tests. It's also just slightly cumbersome to wrap each test in a loop, and each loop needs the same hard-coded limit. doable, but annoying.

Additional context
Happy to work with the maintainers and contribute this feature if there is interest!

[JoshuaKGoldberg]

Duplicate of #2332. I like the idea! 🙂