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Jest 26.2.1 regression: “No tests found” on Windows

See original GitHub issue

🐛 Bug Report

In PostCSS we found a problem with the new Jest release. After updating Jest to 26.2.1, Jest stopped to see tests on Windows in our Travis CI.

$ npx jest

No tests found, exiting with code 1
Run with `--passWithNoTests` to exit with code 0
No files found in C:\Users\travis\build\postcss\postcss.
Make sure Jest's configuration does not exclude this directory.
To set up Jest, make sure a package.json file exists.
Jest Documentation: facebook.github.io/jest/docs/configuration.html
Pattern:  - 0 matches
The command "npx jest" exited with 1.

To Reproduce

Seems like just call npx jest on Windows. Here is a config to call it on Travis CI

matrix:
  include:
    os: windows
    cache: false
    node_js: node
    script: npx jest
    env:
      - YARN_GPG=no

Expected behavior

https://travis-ci.org/github/postcss/postcss/jobs/713424784

Link to repl or repo (highly encouraged)

https://github.com/postcss/postcss/archive/8722140c5c55530b0c4091190f1557b42fd18c87.zip

envinfo

  System:
    OS: Windows 10 10.0.17763
    CPU: (2) x64 Intel(R) Xeon(R) CPU
  Binaries:
    Node: 14.7.0 - C:\ProgramData\nvs\node\14.7.0\x64\node.EXE
    Yarn: 1.22.4 - ~\.yarn\bin\yarn.CMD
    npm: 6.14.7 - C:\ProgramData\nvs\node\14.7.0\x64\npm.CMD
  npmPackages:
    jest: ^26.2.1 => 26.2.1