Rewrite test_sophronia_keeps_hitless_events

invisible_cities/cities/sophronia_test.py

@@ -113,9 +113,11 @@ def test_sophronia_filters_events_with_only_nn_hits(config_tmpdir, sophronia_con
 
 def test_sophronia_keeps_hitless_events(config_tmpdir, sophronia_config):
     """
-    Run with a high q threshold so all hits are discarded (turned into NN).
-    Check that these events are still in the /Run/events output, but not in
-    the /RECO/events output.
+    Run with a high q threshold so all hits are discarded (turned into
+    NN).  Check that these events are still in the /Run/events output,
+    but not in the /RECO/events output. In this case, because the only
+    event processed is not stored, the table and group are not
+    created, so we checked that.
     """
     path_out = os.path.join(config_tmpdir, 'test_sophronia_keeps_hitless_events.h5')
     config   = dict(**sophronia_config)
@@ -130,5 +132,4 @@ def test_sophronia_keeps_hitless_events(config_tmpdir, sophronia_config):
 
     with tb.open_file(path_out) as output_file:
         assert len(output_file.root.Run.events) == 1
-        assert event_number == output_file.root.Run.events[0][0]
-        assert event_number not in output_file.root.RECO.Events.col("event")
+        assert "RECO" not in output_file.root