turbaszek commented on a change in pull request #9544:
URL: https://github.com/apache/airflow/pull/9544#discussion_r449756656



##########
File path: tests/models/test_dagrun.py
##########
@@ -642,3 +642,27 @@ def test_wait_for_downstream(self, prev_ti_state, 
is_ti_success):
         ti.set_state(State.QUEUED)
         ti.run()
         self.assertEqual(ti.state == State.SUCCESS, is_ti_success)
+
+    @mock.patch.object(DagRun, 
'_emit_true_scheduling_delay_stats_for_finished_state')
+    def test_dag_stats(self, stats_mock):
+        """
+        Tests that dag scheduling delay stat is called.
+        """
+        dag = DAG(
+            dag_id='test_dagrun_stats',
+            start_date=timezone.datetime(2017, 1, 1)
+        )
+        dag_task = DummyOperator(
+            task_id='dummy1',
+            dag=dag
+        )
+
+        initial_task_states = {
+            dag_task.task_id: State.SUCCESS,
+        }
+
+        dag_run = self.create_dag_run(dag=dag,
+                                      state=State.RUNNING,
+                                      task_states=initial_task_states)
+        dag_run.update_state()
+        stats_mock.assert_called()

Review comment:
       Can you please use `assert_called_once_with`?




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