$ node node_modules/@ckeditor/ckeditor5-dev-tests/bin/test.js
⚠ You're running tests in dev mode - some error protections are loose. Use the `--production` flag to use strictest verification methods.
02 05 2021 11:26:38.277:WARN [config]: Pattern "/" does not match any file.
Error: Not found files to tests. Specified patterns are invalid.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.