Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\SistemasPHP\observatorio4\vendor\stack\builder\tests\unit\Stack\BuilderTest.php:13 Stack trace: #0 {main} thrown in C:\SistemasPHP\observatorio4\vendor\stack\builder\tests\unit\Stack\BuilderTest.php on line 13