Make monkeypatching of function temporary

tests/test_webservice.py

@@ -144,13 +144,15 @@ async def test_wait_on_transfer_exceptions(
         ('sim', ['DARK', '1', '2', '3', '4'], 1, "success: simulated"),
     ],
 )
-async def test_run_action(mode, cmd, retcode, expected):
+async def test_run_action(mode, cmd, retcode, expected, monkeypatch):
     job_db = mock.Mock()
 
     async def mock_run_proc_async(*args):
         return retcode, b'Submitted job: 42'
 
-    webservice.webservice.run_proc_async = mock_run_proc_async
+    monkeypatch.setattr(
+        webservice.webservice, 'run_proc_async', mock_run_proc_async
+    )
     ret = await run_action(job_db, cmd, mode, 1, 1, 1)
     assert ret.lower().startswith(expected)