diff --git a/jupyter_events/logger.py b/jupyter_events/logger.py
index 96a3bf4..63838e0 100644
--- a/jupyter_events/logger.py
+++ b/jupyter_events/logger.py
@@ -144,7 +144,7 @@ def register_event_schema(self, schema: SchemaType) -> None:
         """
         event_schema = self.schemas.register(schema)  # type:ignore[arg-type]
         key = event_schema.id
-        # It's possible that listeners and modifiers have been added for this 
+        # It's possible that listeners and modifiers have been added for this
         # schema before the schema is registered.
         if key not in self._modifiers:
             self._modifiers[key] = set()
@@ -209,7 +209,7 @@ def add_modifier(
         # If the schema ID and version is given, only add
         # this modifier to that schema
         if schema_id:
-            # If the schema hasn't been added yet, 
+            # If the schema hasn't been added yet,
             # start a placeholder set.
             modifiers = self._modifiers.get(schema_id, set())
             modifiers.add(modifier)
@@ -272,15 +272,15 @@ def add_listener(
         # this modifier to that schema
         if schema_id:
             if modified:
-                # If the schema hasn't been added yet, 
+                # If the schema hasn't been added yet,
                 # start a placeholder set.
                 listeners = self._modified_listeners.get(schema_id, set())
                 listeners.add(listener)
-                self._modified_listeners[schema_id] = listeners 
+                self._modified_listeners[schema_id] = listeners
                 return
             listeners = self._unmodified_listeners.get(schema_id, set())
             listeners.add(listener)
-            self._unmodified_listeners[schema_id] = listeners 
+            self._unmodified_listeners[schema_id] = listeners
             return
         for id_ in self.schemas.schema_ids:
             if schema_id is None or id_ == schema_id:
diff --git a/tests/test_listeners.py b/tests/test_listeners.py
index 97035cd..f925dc5 100644
--- a/tests/test_listeners.py
+++ b/tests/test_listeners.py
@@ -142,7 +142,8 @@ async def my_listener(logger: EventLogger, schema_id: str, data: dict) -> None:
 
 @pytest.mark.parametrize(
     # Make sure no schemas are added at the start of this test.
-    "jp_event_schemas", ([],) 
+    "jp_event_schemas",
+    ([],),
 )
 async def test_listener_added_before_schemas_passes(jp_event_logger, schema):
     # Ensure there are no schemas listed.
@@ -164,7 +165,7 @@ async def my_listener(logger: EventLogger, schema_id: str, data: dict) -> None:
     assert not listener_was_called
 
     # Now register the event and emit.
-    jp_event_logger.register_event_schema(schema)        
+    jp_event_logger.register_event_schema(schema)
 
     # Try emitting the event again and ensure the listener saw it.
     jp_event_logger.emit(schema_id=schema.id, data={"prop": "hello, world"})