add test to check default timetable

Author: duprijil

tests/unit/dags/test_fetch_notices_by_date.py

@@ -4,7 +4,6 @@
 from airflow.models import DagBag, Variable
 from airflow.timetables.trigger import CronTriggerTimetable
 
-from dags.fetch_notices_by_date import DAG_FETCH_DEFAULT_TIMEZONE
 from ted_sws import DAG_FETCH_DEFAULT_TIMETABLE
 
 
@@ -44,6 +43,32 @@ def test_fetcher_change_timetable_from_env_variable_after_reparse(dag_bag: DagBa
     assert fetcher_dag.schedule_interval == example_dag_cron_table._expression
 
     assert all(airflow_timetable_import_error_name not in error for error in dag_bag.import_errors.values())
+    del os.environ[dag_fetch_schedule_variable_name]
+
+
+def test_fetcher_has_default_timetable_if_no_variable_is_set_after_reparse(dag_bag: DagBag,
+                                                                           dag_fetch_schedule_variable_name: str,
+                                                                           fetcher_dag_id: str,
+                                                                           airflow_timetable_import_error_name: str):
+    env_var_value = os.getenv(dag_fetch_schedule_variable_name)
+    is_env_var_set: bool = True if env_var_value is not None else False
+    if is_env_var_set:
+        del os.environ[dag_fetch_schedule_variable_name]
+    airflow_var_value = Variable.get(key=dag_fetch_schedule_variable_name, default_var=None)
+    is_airflow_var_set: bool = True if airflow_var_value is not None else False
+    if is_airflow_var_set:
+        Variable.delete(key=dag_fetch_schedule_variable_name)
+
+    dag_bag.collect_dags()
+    fetcher_dag: DAG = dag_bag.get_dag(dag_id=fetcher_dag_id)
+    assert fetcher_dag is not None
+    assert fetcher_dag.schedule_interval == DAG_FETCH_DEFAULT_TIMETABLE
+    assert all(airflow_timetable_import_error_name not in error for error in dag_bag.import_errors.values())
+
+    if is_env_var_set:
+        os.environ[dag_fetch_schedule_variable_name] = env_var_value
+    if is_airflow_var_set:
+        Variable.set(key=dag_fetch_schedule_variable_name, value=airflow_var_value)
 
 
 def test_fetcher_gets_incorrect_timetable_after_reparse(dag_bag: DagBag,
@@ -53,9 +78,6 @@ def test_fetcher_gets_incorrect_timetable_after_reparse(dag_bag: DagBag,
                                                         airflow_timetable_import_error_name: str):
     fetcher_dag: DAG = dag_bag.get_dag(dag_id=fetcher_dag_id)
     assert fetcher_dag is not None
-    default_dag_timetable = CronTriggerTimetable(cron=DAG_FETCH_DEFAULT_TIMETABLE,
-                                                 timezone=DAG_FETCH_DEFAULT_TIMEZONE)
-    assert fetcher_dag.schedule_interval == default_dag_timetable._expression
 
     Variable.set(key=dag_fetch_schedule_variable_name, value=example_wrong_cron_table)
     dag_bag.collect_dags(only_if_updated=False)