Documentation for PHPUnit

Documentation for PHPUnit 7.0 (and newer) is hosted on phpunit.readthedocs.io:

Documentation for PHPUnit 6.5 (and older) is archived at https://phpunit.de/manual/6.5/en/index.html. Simply replace 6.5 with the version number you are looking for. Simply replace en with fr, pt_br, ja, or zh_cn to access the French, Brazilian Portuguese, Japanese, or Simplified Chinese translation, respectively.