Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\SistemasPHP\observatorio4\vendor\symfony\validator\Test\ConstraintValidatorTestCase.php:39 Stack trace: #0 {main} thrown in C:\SistemasPHP\observatorio4\vendor\symfony\validator\Test\ConstraintValidatorTestCase.php on line 39