ecraig12345 / repro-jest-util-dep

Repro of an issue with a missing dep in jest-util

Demonstrating a misleading error message caused by a missing dependency in a package manager with strict/non-hoisted installation layout.

This repro uses yarn v4 with nodeLinker: pnpm, but the same issue would happen with pnpm itself.

1. Clone the repo and cd in
2. Verify yarn -v shows 4.1.1
3. yarn
4. yarn test => observe that tests run but there's an "Invalid testPattern" message
5. yarn test other => observe that all tests run, not only the selected test

The actual issue is that jest-util is missing a dep on jest-regex-util (and due to the non-hoisted layout, it's not implicitly present), but the warning message it causes is very misleading:

$ yarn jest
  Invalid testPattern  supplied. Running all tests instead.
  Invalid testPattern  supplied. Running all tests instead.
 PASS  ./other.test.js
 PASS  ./index.test.js

Test Suites: 2 passed, 2 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        0.346 s, estimated 1 s
Ran all test suites.

$ yarn jest other
  Invalid testPattern other supplied. Running all tests instead.
  Invalid testPattern other supplied. Running all tests instead.
 PASS  ./other.test.js
 PASS  ./index.test.js

Test Suites: 2 passed, 2 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        0.27 s, estimated 1 s
Ran all test suites.