add test case for multi type filter

tests/unit/test_event_stream.py

@@ -7,6 +7,7 @@
 from openhands.events.action import (
     NullAction,
 )
+from openhands.events.action.message import MessageAction
 from openhands.events.observation import NullObservation
 from openhands.storage import get_file_store
 
@@ -72,6 +73,7 @@ def test_get_matching_events_type_filter(temp_dir: str):
     event_stream.add_event(NullAction(), EventSource.AGENT)
     event_stream.add_event(NullObservation('test'), EventSource.AGENT)
     event_stream.add_event(NullAction(), EventSource.AGENT)
+    event_stream.add_event(MessageAction(content='test'), EventSource.AGENT)
 
     # Filter by NullAction
     events = event_stream.get_matching_events(event_types=(NullAction,))
@@ -83,6 +85,10 @@ def test_get_matching_events_type_filter(temp_dir: str):
     assert len(events) == 1
     assert events[0]['observation'] == 'null'
 
+    # Filter by NullAction and MessageAction
+    events = event_stream.get_matching_events(event_types=(NullAction, MessageAction))
+    assert len(events) == 3
+
 
 def test_get_matching_events_query_search(temp_dir: str):
     file_store = get_file_store('local', temp_dir)