Fatal error: Uncaught Error: Class 'Tests\fixtures\FixtureTestCase' not found in /var/www/html/lib/php-imap-master/tests/fixtures/KsC56011987HeadersTest.php:20 Stack trace: #0 {main} thrown in /var/www/html/lib/php-imap-master/tests/fixtures/KsC56011987HeadersTest.php on line 20