add unit tests for new Python API

test/python/api/conftest.py

@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# This file is part of Nominatim. (https://nominatim.org)
+#
+# Copyright (C) 2022 by the Nominatim developer community.
+# For a full list of authors see the git log.
+"""
+Helper fixtures for API call tests.
+"""
+from pathlib import Path
+import pytest
+import time
+
+from nominatim.api import NominatimAPI
+
+@pytest.fixture
+def apiobj(temp_db):
+    """ Create an asynchronous SQLAlchemy engine for the test DB.
+    """
+    api = NominatimAPI(Path('/invalid'), {})
+    yield api
+    api.close()