Fatal error: Uncaught Error: Class "Tests\TestCase" not found in /home3/offerba1/public_html/platform/plugins/ecommerce/tests/Unit/InvoiceEmailAttachmentTest.php:17 Stack trace: #0 {main} thrown in /home3/offerba1/public_html/platform/plugins/ecommerce/tests/Unit/InvoiceEmailAttachmentTest.php on line 17