feat: Allow passing `stats` object to `pass` and `fail` functions

It would be useful to allow passing stats object to pass and fail functions.

Use case. Some runners (for instance, jest-runner-tsd) are counting passing / failing tests per file. If I get it right, at the moment create-jest-runner assumes that the whole file passed or failed. Hence, jest-runner-tsd is implementing custom pass, fail and toTestResult functions. Looks like this is unnecessary boiler plate code.

Alternatively it would be possible to expose toTestResult from create-jest-runner. Not sure about this. I think it is better to extend pass, fail allowing to pass stats (with defaults as they are set now):

interface Stats {
  failures: number;
  passes: number;
  pending: number;
  todo: number;
}

Glad to work on this. Just wanted to agree on the directions first.

[lokshunhung]

@mrazauskas I found it, here you go (The basic functionality of spell checking sort of works). I think all the runners that I listed in my last message are not written in TypeScript.

Just “sort of constants”, not constants in the strict sense.

I guess that’s one way to put it. You treat each one as a template as a possible outcome of the test result.

[SimenB]

Yeah, seems sensible 👍