Fatal error: Uncaught Error: Class "Negotiation\Tests\TestCase" not found in /home/flighto/e-commerce/vendor/willdurand/negotiation/tests/Negotiation/Tests/LanguageNegotiatorTest.php:8 Stack trace: #0 {main} thrown in /home/flighto/e-commerce/vendor/willdurand/negotiation/tests/Negotiation/Tests/LanguageNegotiatorTest.php on line 8