Extract execution_app retrieval into a pytest fixture

airflow-core/tests/unit/api_fastapi/conftest.py

@@ -170,3 +170,15 @@ def dagbag():
 
     parse_and_sync_to_db(os.devnull, include_examples=True)
     return DagBag(read_dags_from_db=True)
+
+
+@pytest.fixture
+def get_execution_app():
+    def _get_execution_app(test_client):
+        test_app = test_client.app
+        for route in test_app.router.routes:
+            if route.path == "/execution":
+                return route.app
+        raise RuntimeError("Execution app not found at /execution")
+
+    return _get_execution_app

airflow-core/tests/unit/api_fastapi/test_app.py

@@ -60,14 +60,11 @@ def test_execution_api_app(mock_create_task_exec_api, mock_init_plugins, mock_in
     mock_init_plugins.assert_not_called()
 
 
-def test_execution_api_app_lifespan(client):
+def test_execution_api_app_lifespan(client, get_execution_app):
     with client(apps="execution") as test_client:
-        test_app = test_client.app
-
-        # assert the execution app was created and lifespan was called
-        execution_app = [route.app for route in test_app.router.routes if route.path == "/execution"]
+        execution_app = get_execution_app(test_client)
         assert execution_app, "Execution API app not found in FastAPI app."
-        assert execution_app[0].state.lifespan_called, "Lifespan not called on Execution API app."
+        assert execution_app.state.lifespan_called, "Lifespan not called on Execution API app."
 
 
 @mock.patch("airflow.api_fastapi.app.init_views")