Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\r10ca\vendor\doctrine\lexer\tests\AbstractLexerTest.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10ca\vendor\doctrine\lexer\tests\AbstractLexerTest.php on line 17