Fatal error: Uncaught Error: Class "Negotiation\Tests\TestCase" not found in C:\xampp\htdocs\BK\bateriasec\vendor\willdurand\negotiation\tests\Negotiation\Tests\LanguageNegotiatorTest.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\BK\bateriasec\vendor\willdurand\negotiation\tests\Negotiation\Tests\LanguageNegotiatorTest.php on line 8