kaxil commented on a change in pull request #5743: [AIRFLOW-5088][AIP-24] 
Persisting serialized DAG in DB for webserver scalability
URL: https://github.com/apache/airflow/pull/5743#discussion_r313873900
 
 

 ##########
 File path: tests/models/test_serialized_dag.py
 ##########
 @@ -0,0 +1,106 @@
+# -*- coding: utf-8 -*-
+#
+# 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.
+
+"""Unit tests for SerializedDagModel."""
+
+import unittest
+
+from airflow import example_dags as example_dags_module
+from airflow.dag.serialization.serialized_dag import SerializedDAG
+from airflow.models import DagBag
+from airflow.models import SerializedDagModel as SDM
+from airflow.utils import db
+
+
+# FIXME: it is defined in tests/dags/test_dag_serialization.py as well.
+# To move it to a shared module.
+def make_example_dags(module):
+    """Loads DAGs from a module for test."""
+    dagbag = DagBag(module.__path__[0])
+    return dagbag.dags
+
+
+# FIXME: move it to airflow/utils/db.py if needed.
+def clear_db_serialized_dags():
+    with db.create_session() as session:
+        session.query(SDM).delete()
+
+
+class SerializedDagModelTest(unittest.TestCase):
+    """Unit tests for SerializedDagModel."""
+
+    def setUp(self):
+        clear_db_serialized_dags()
+
+    def tearDown(self):
+        clear_db_serialized_dags()
+
+    def test_dag_fileloc_hash(self):
+        """Verifies the correctness of hashing file path."""
+        self.assertTrue(SDM.dag_fileloc_hash('/airflow/dags/test_dag.py') == 
60791)
+
+    def _write_example_dags(self):
+        example_dags = make_example_dags(example_dags_module)
+        for dag in example_dags.values():
+            SDM.write_dag(dag)
+        return example_dags
+
+    def test_write_dag(self):
+        """DAGs can be written into database."""
+        example_dags = self._write_example_dags()
+
+        with db.create_session() as session:
+            for dag in example_dags.values():
+                self.assertTrue(SDM.has_dag(dag.dag_id))
+                result = session.query(
+                    SDM.fileloc, SDM.data).filter(SDM.dag_id == 
dag.dag_id).one()
+
+                self.assertTrue(result.fileloc == dag.full_filepath)
+                # Verifies JSON schema.
+                SerializedDAG.validate_json(result.data)
+
+    def test_read_dags(self):
+        """DAGs can be read from database."""
+        example_dags = self._write_example_dags()
+        serialized_dags = SDM.read_all_dags()
+        self.assertTrue(len(example_dags) == len(serialized_dags))
+        for dag_id, dag in example_dags.items():
+            serialized_dag = serialized_dags[dag_id]
+
+            self.assertTrue(serialized_dag.dag_id == dag.dag_id)
+            self.assertTrue(set(serialized_dag.task_dict) == 
set(dag.task_dict))
+
+    def test_remove_dags(self):
+        """DAGs can be removed from database."""
+        example_dags_list = list(self._write_example_dags().values())
+        print("1", example_dags_list)
 
 Review comment:
   Temporary - to remove

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