AIP-47 - Migrate google leveldb DAGs to new design ##22447 (#24233)

Author: chethanuk

docs/apache-airflow-providers-google/operators/leveldb/leveldb.rst

@@ -36,7 +36,7 @@ Put key
 Get, put, delete key or write_batch, create database with comparator or different options in LevelDB is performed with the
 :class:`~airflow.providers.google.leveldb.operators.leveldb.LevelDBOperator` operator.
 
-.. exampleinclude:: /../../airflow/providers/google/leveldb/example_dags/example_leveldb.py
+.. exampleinclude:: /../../tests/system/providers/google/leveldb/example_leveldb.py
     :language: python
     :dedent: 4
     :start-after: [START howto_operator_leveldb_put_key]

airflow/providers/google/leveldb/example_dags/__init__.py renamed to tests/system/providers/google/__init__.py

@@ -0,0 +1,17 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.

tests/system/providers/google/leveldb/__init__.py

@@ -19,13 +19,18 @@
 Example use of LevelDB operators.
 """
 
+import os
 from datetime import datetime
 
 from airflow import models
 from airflow.providers.google.leveldb.operators.leveldb import LevelDBOperator
+from airflow.utils.trigger_rule import TriggerRule
+
+ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID")
+DAG_ID = "example_leveldb"
 
 with models.DAG(
-    'example_leveldb',
+    DAG_ID,
     start_date=datetime(2021, 1, 1),
     schedule_interval='@once',
     catchup=False,
@@ -40,6 +45,19 @@
         command='put',
         key=b'another_key',
         value=b'another_value',
+        trigger_rule=TriggerRule.ALL_DONE,
     )
     # [END howto_operator_leveldb_put_key]
     get_key_leveldb_task >> put_key_leveldb_task
+
+    from tests.system.utils.watcher import watcher
+
+    # This test needs watcher in order to properly mark success/failure
+    # when "tearDown" task with trigger rule is part of the DAG
+    list(dag.tasks) >> watcher()
+
+
+from tests.system.utils import get_test_run  # noqa: E402
+
+# Needed to run the example DAG with pytest (see: tests/system/README.md#run_via_pytest)
+test_run = get_test_run(dag)