added description for solution of a bug when writing test outputs

controller/northbound/server/auth_test.go

@@ -833,6 +833,10 @@ func createTestRoles() error {
 	return nil
 }
 
+// This is needed as a workaround for a bug where the output of the getUser test falsely was
+// that it failed while actually passing. Apparantely, this can happen when loggers write
+// the output of test cases.
+// Solution found here: https://github.com/gotestyourself/gotestsum/issues/141#issuecomment-686243110
 func patchLogger(t *testing.T) {
 	orig := log.Writer()
 	buf := new(bytes.Buffer)