Fatal error: Uncaught Error: Class "Slack\Tests\TestCase" not found in /home/neftenergies/public_html/docroot.assets.neftenergies.com/snipe-it/vendor/alek13/slack/tests/AttachmentUnitTest.php:9 Stack trace: #0 {main} thrown in /home/neftenergies/public_html/docroot.assets.neftenergies.com/snipe-it/vendor/alek13/slack/tests/AttachmentUnitTest.php on line 9