Fatal error: Uncaught Error: Class 'TestCase' not found in /home/demoinvfsanz/public_html/vendor/maatwebsite/excel/tests/Writers/ExcelWriterTest.php:5 Stack trace: #0 {main} thrown in /home/demoinvfsanz/public_html/vendor/maatwebsite/excel/tests/Writers/ExcelWriterTest.php on line 5