test: drop alembic tables after migration test is over (#70)

Author: Ilya Gurov

migration_test_cleanup.py

@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright 2021 Google LLC
+#
+# Licensed 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
+#
+#     https://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.
+
+from google.cloud import spanner
+
+client = spanner.Client()
+
+instance = client.instance("sqlalchemy-dialect-test")
+database = instance.database("compliance-test")
+
+database.update_ddl(["DROP TABLE account", "DROP TABLE alembic_version"]).result(120)

noxfile.py

@@ -157,3 +157,4 @@ def migration_test(session):
     # clearing the migration data
     os.remove("alembic.ini")
     shutil.rmtree("test_migration")
+    session.run("python", "migration_test_cleanup.py")