how a class call with this format? [duplicate]

hi I clone a php library from github but xampp get this error:
Fatal error: Uncaught Error: Class “PHPUnitFrameworkTestCase” not found in C:xampphtdocsbrowsertestsBrowserTest.php:12 Stack trace: #0 {main} thrown in C:xampphtdocsbrowsertestsBrowserTest.php on line 12

I not exper but someone can help to me