Integrate alembic check in test

Author: guan404ming

airflow-core/tests/unit/utils/test_db.py

@@ -28,6 +28,7 @@
 
 import pytest
 from alembic.autogenerate import compare_metadata
+from alembic.command import check
 from alembic.config import Config
 from alembic.migration import MigrationContext
 from alembic.runtime.environment import EnvironmentContext
@@ -302,3 +303,13 @@ def test_upgradedb_raises_if_lower_than_v3_0_0(self, mock_inspect, caplog):
             "Downgrade to revision less than 3.0.0 requires that `ab_user` table is present. "
             "Please add FabDBManager to [core] external_db_managers and run fab migrations before proceeding"
         ) in caplog.text
+
+    def test_has_pending_upgrade_ops(self):
+        with mock.patch.dict(
+            os.environ, {"AIRFLOW__DATABASE__ALEMBIC_INI_FILE_PATH": "/tmp/alembic.ini"}, clear=True
+        ):
+            config = _get_alembic_config()
+            assert config.config_file_name == "/tmp/alembic.ini"
+
+        config = _get_alembic_config()
+        check(config)