Warning: Unsupported declare 'strict_types' in D:\xampp\htdocs\jukester_release4\vendor\sebastian\diff\tests\ChunkTest.php on line 1

Fatal error: Class 'PHPUnit\Framework\TestCase' not found in D:\xampp\htdocs\jukester_release4\vendor\sebastian\diff\tests\ChunkTest.php on line 19