decorator added

tests/test_dag.py

@@ -18,4 +18,4 @@ class TestADag(unittest.TestCase):
         dag = self.dagbag.get_dag(dag_id='taskflow_example')
         assert self.dagbag.import_errors == {}
         assert dag is not None
-        self.assertEqual(len(dag.tasks), 3, f"Actually: {len(dag.tasks)}")
+        self.assertEqual(len(dag.tasks), 5, f"Actually: {len(dag.tasks)}")