Watch plugin support: terminate test run per test basis

[unional]

🚀 Feature Proposal

Add a function onTestComplete() to jestHooks which, if the callback returns false (or Promise resolves to false), will end the test run.

Motivation

When making changes, you can break multiple tests at the same time.
I want the bail ability during watch mode so that I can focus on one test at a time.

Currently, I have to use t/p and change specific test to test.only(), one at a time.

Supporting this allows me to work immediately on one error at a time without being overloaded with all the errors.

[jeysal]

Does updateConfigAndRun({ bail: true }) not work for this use case?

[unional]

Nope, it does not work. I use jest-watch-toggle-config to toggle it and it still runs all tests.

[jeysal]

I've just checked and setting bail to true in a watch mode plugin definitely works (though I didn't use jest-watch-toggle-config to check).
Of course Jest does not bail after a single test case failed though, only after an entire test file was run with 1+ failing tests in it, which is what it also does when invoked with --bail right away.

[unional]

I see. I always thought bail will bail on the first test error. So it is for one test suite.

Does it make sense to have bail fail that way or another flag that quit on the first failed test?

[SimenB]

As @jeysal points out, this works as intended.

Does it make sense to have bail fail that way or another flag that quit on the first failed test?

#7453

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