⚠️ Dropping Mocha support in Detox 20 ⚠️

[noomorph]

Before you think the heading already tells the entire story, I must mention that being Test Runner Independent (as noted in README) still remains one of the values of Detox.

At the moment, there's already a considerable feature gap between Mocha and Jest integrations, and since we intend to keep improving the current integration with jest-circus and add more important bugfixes and features (multi-device support, canonically extending the matchers, etc), we have to choose a trade-off between:

1. neglect the improvements and do nothing? 🤨 – not an option at all, because we love our product, first of all.
2. leave Mocha integration as-is and keep developing the Jest counterpart – theoretically possible, but leaves a lot of legacy code and adds more regression testing, and the gap will keep growing – what is the value then?
3. dive into the latest Mocha docs and try to develop an on-par integration – extra time and extra risks, and as a team, currently, we have no capacity to spread our efforts that wide.
4. drop Mocha support, perform all the intended refactorings and feature addition, see where it has led us to, define how the ideal test runner protocol looks like for us, and after one more major release – get ready to embrace third-party integrations with the test runners.

Obviously, the future of number 4 is still vague and contains not fewer risks, but there I see an opening for a more optimistic storyline, where we eventually become able to provide 1st class support for many runners instead of one and a half (if we are honest).

@d4vidi @asafkorem @jonathanmos

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
If you believe the issue is still relevant, please test on the latest Detox and report back.

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[noomorph]

Not stale, after the war we'll get back to the issue as well. 🇺🇦

UPD: Detox 20 is likely to be released between end-Sep and mid-Oct 2022.
The preview version is already available on NPM:

npm install detox@prerelease -D

[noomorph]

So we managed to resolve this Mocha issue even earlier. 💛💙
Done.

Please migrate: https://wix.github.io/Detox/docs/guide/migration#200