job manager tests: fail on all warnings (except our own deprecation warnings)

related to #641, #656

Author: soxofaan

tests/extra/test_job_management.py

@@ -77,6 +77,8 @@ def sleep_mock():
         yield sleep
 
 
+@pytest.mark.filterwarnings("default:.*`output_file` argument is deprecated.*:DeprecationWarning")
+@pytest.mark.filterwarnings("error")
 class TestMultiBackendJobManager:
 
     @pytest.fixture