Fatal error: Uncaught Error: Class 'UnitTestCase' not found in D:\xampp\htdocs\elmontedesion\sis_bib\modelo\htmlpurifier-4.15.0\tests\FSTools\FileSystemHarness.php:9 Stack trace: #0 {main} thrown in D:\xampp\htdocs\elmontedesion\sis_bib\modelo\htmlpurifier-4.15.0\tests\FSTools\FileSystemHarness.php on line 9