Detox: Jest CLI options such as --onlyChanged don’t work

Description

Jest CLI options such as --onlyChanged and --watch don’t work because Detox always passes the e2e directory.

✓ I have tested this issue on the latest Detox release and it still reproduces.

Reproduction

1. Clone DetoxTemplate.
2. Follow the instructions there.
3. npm install detox@18.19.0 --save-dev
4. npm run test:ios-debug -- --onlyChanged

Expected behavior

Jest understands the --onlyChanged option and only runs tests which have changed.

Suggested solution

Detox explicitly passes the e2e directory when invoking Jest, for example, jest --config e2e/config.json e2e. When specifying both --onlyChanged and e2e, Jest gives preference to e2e and runs all tests.

However, specifying e2e is not really necessary because Jest defaults to running all tests matching testMatch in the rootDir. For example, jest --config e2e/config.json also executes all tests.

Without e2e, options such as --onlyChanged work. For example, you can invoke Jest manually with:

$ DETOX_CONFIGURATION="ios.sim.debug" npx jest --config e2e/config.json --onlyChanged

Then, Jest properly exits with “No tests found related to files changed since last commit.”

Environment

• Detox: 18.19.0
• React Native: 0.64.4
• Node: 14.17.3