How to read testbot feedback / get more info I have created a patch for migrate_spreadsheet, unfortunately it will not pass the testbot. Instead that gives me this (to me cryptic / uninformative) message:


  fail: [run-tests.sh check] Line 0 of : FATAL
  Drupal\Tests\migrate_spreadsheet\Unit\SpreadsheetIteratorTest: test
  runner returned a non-zero error code (255).


Where/what is line 0? My first change compared to the original file was on line 7, where I corrected a class name. The only other two changes in that file where in the docs.

So what does this fail mean? 
How can I get more info from the testbot?
If you click the colored patch result (above), you will get to a detailed page. On the top of that page there is a link 'View results on dispatcher'. That will get you to the test. Then go to the 'Console output' (on the left) (direct link).

The actual error appears to be:


  13:56:12 PHP Fatal error:  Class
  'PhpOffice\PhpSpreadsheet\Worksheet\Worksheet' not found in
  /var/www/html/modules/contrib/migrate_spreadsheet/tests/src/Unit/SpreadsheetIteratorTest.php
  on line 187