Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in D:\xampp\htdocs\ssw_doc\vendor\setasign\fpdi\tests\functional\PdfReader\PdfReaderTest.php:20 Stack trace: #0 {main} thrown in D:\xampp\htdocs\ssw_doc\vendor\setasign\fpdi\tests\functional\PdfReader\PdfReaderTest.php on line 20