Better diagnostic: tell what events were expected

modules/Bio/EnsEMBL/Hive/Utils/Test.pm

@@ -81,7 +81,10 @@ sub standaloneJob {
             ok(Bio::EnsEMBL::Hive::Scripts::StandaloneJob::standaloneJob($module_or_file, $input_id, $flags, undef, $flags->{language}), 'job completed');
         }, sprintf('standaloneJob("%s", %s, (...), %s)', $module_or_file, stringify($param_hash), stringify($flags)));
 
-        ok(!scalar(@$events_to_test), 'no untriggered events') if $expected_events;
+        if ($expected_events) {
+            ok(!scalar(@$events_to_test), 'no untriggered events');
+            diag("Did not receive: " . stringify($events_to_test)) if scalar(@$events_to_test);
+        }
     }
 }