fix: added hasattr check to NanoAODEvents __repr__

tests/test_nanoevents.py

@@ -156,3 +156,26 @@ def test_read_nanodata(suffix):
 
     crossref(events)
     crossref(events[ak.num(events.Jet) > 2])
+
+
+def test_missing_eventIds_error():
+    path = os.path.abspath("tests/samples/missing_luminosityBlock.root")
+    with pytest.raises(
+        Exception,
+        match="There are missing event ID fields: ['luminosityBlock'] \n\n\
+                    The event ID fields ['run', 'luminosityBlock', 'event'] are necessary to perform sub-run identification \
+                    (e.g. for corrections and sub-dividing data during different detector conditions),\
+                    to cross-validate MC and Data (i.e. matching events for comparison), and to generate event displays. \
+                    It's advised to never drop these branches from the dataformat.\n\n\
+                    This error can be demoted to a warning by setting the class level variable error_missing_event_ids to False.",
+    ):
+        factory = NanoEventsFactory.from_root(path, schemaclass=NanoAODSchema)
+        factory.events()
+
+
+def test_missing_eventIds_warning():
+    path = os.path.abspath("tests/samples/missing_luminosityBlock.root")
+    with pytest.raises(RuntimeWarning, match="Missing event_ids : ['luminosityBlock']"):
+        NanoAODSchema.error_missing_event_ids = False
+        factory = NanoEventsFactory.from_root(path, schemaclass=NanoAODSchema)
+        factory.events()