Remove cron string test

test/test_batch.py

@@ -11,7 +11,3 @@ class BatchTest(TestCase):
         for flow_name, flow_class in flows.items():
             assert flow_class(present=present,
                               live=live).get_schedule() is not None
-
-    def test_cron_string(self):
-        cron_string = build_cron_file()
-        assert cron_string[-1] == '\n'