chore: add simple app auth test

tests/test_app.py

@@ -0,0 +1,30 @@
+#  *******************************************************************************
+#  Copyright (c) 2024 Eclipse Foundation and others.
+#  This program and the accompanying materials are made available
+#  under the terms of the Eclipse Public License 2.0
+#  which is available at http://www.eclipse.org/legal/epl-v20.html
+#  SPDX-License-Identifier: EPL-2.0
+#  *******************************************************************************
+import logging
+
+import pytest
+
+from otterdog.providers.github.auth import app_auth
+from otterdog.providers.github.rest import RestApi
+
+_logger = logging.getLogger(__name__)
+
+_APP_ID = ""
+_APP_PRIVATE_KEY = ""
+
+
+@pytest.mark.asyncio
+@pytest.mark.skipif(not _APP_ID, reason="need to fill in app values")
+async def test_list_installations():
+    async with RestApi(app_auth(_APP_ID, _APP_PRIVATE_KEY)) as rest_api:
+        installations = await rest_api.app.get_app_installations()
+
+        for installation in installations:
+            permissions = installation["permissions"]
+            if "merge_queue" not in permissions:
+                _logger.info(f"{installation['account']['login']} -> missing merge_queue permission")