Jest25: --findRelatedTests not working in hidden directory on windows

[nicojs]

🐛 Bug Report

Since v25, --findRelatedTests no longer works on Windows when running in a hidden directory (a directory starting with a .).

To Reproduce

A really small reproduction repo can be found here: https://github.com/nicojs/jest-find-related-test-bug

On windows:

git clone git@github.com:nicojs/jest-find-related-test-bug.git
cd jest-find-related-test-bug/.hidden
npm i
npx jest --findRelatedTests src/sum.js

Expected behavior

 PASS  src/sum.test.js
  √ adds 1 + 2 to equal 3 (2ms)
  √ sub 1 - 0 to equal 1

Test Suites: 1 passed, 1 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        3.381s
Ran all test suites related to files matching /src\\sum.js/i.

But was:

No tests found, exiting with code 1
Run with `--passWithNoTests` to exit with code 0
In C:\z\github\nicojs\jest-find-related-test-bug\.hidden
  4 files checked.
  testMatch: **/__tests__/**/*.[jt]s?(x), **/?(*.)+(spec|test).[tj]s?(x) - 1 match
  testPathIgnorePatterns: \\node_modules\\ - 4 matches
  testRegex:  - 0 matches
Pattern: src\\sum.js - 0 matches

This behavior broke with jest@25. I.e. this works:

npm i jest@24
npx jest --findRelatedTests src/sum.js

Moving the code to a non-hidden directory also works:

cd ..
mv .hidden hidden
cd hidden
npx jest --findRelatedTests src/sum.js

Or Linux also seems to work (tested with Windows Subsystem for Linux).

Link to repl or repo (highly encouraged)

https://github.com/nicojs/jest-find-related-test-bug

envinfo

 System:
    OS: Windows 10 10.0.18363
    CPU: (8) x64 Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz
  Binaries:
    Node: 12.16.1 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.12.3 - ~\AppData\Roaming\npm\yarn.CMD
    npm: 6.13.6 - C:\Program Files\nodejs\npm.CMD
  npmPackages:
    jest: ^25.2.3 => 25.2.3

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