Fatal error: Uncaught Error: Class "Tests\fixtures\FixtureTestCase" not found in D:\programs\xampp\htdocs\backend-test\vendor\webklex\php-imap\tests\fixtures\StructuredWithAttachmentTest.php:23 Stack trace: #0 {main} thrown in D:\programs\xampp\htdocs\backend-test\vendor\webklex\php-imap\tests\fixtures\StructuredWithAttachmentTest.php on line 23