diff --git a/tracetools_test/tracetools_test/case.py b/tracetools_test/tracetools_test/case.py
index 353edb3..a530ddf 100644
--- a/tracetools_test/tracetools_test/case.py
+++ b/tracetools_test/tracetools_test/case.py
@@ -320,38 +320,42 @@ class TraceTestCase(unittest.TestCase):
     def get_events_with_field_value(
         self,
         field_name: str,
-        field_value: Any,
+        field_values: Any,
         events: List[DictEvent] = None
     ) -> List[DictEvent]:
         """
         Get all events with the given field:value.
 
         :param field_name: the name of the field to check
-        :param field_value: the value of the field to check
+        :param field_values: the value(s) of the field to check
         :param events: the events to check (or `None` to check all events)
         :return: the events with the given field:value pair
         """
+        if not isinstance(field_values, list):
+            field_values = [field_values]
         if events is None:
             events = self._events
-        return [e for e in events if get_field(e, field_name, None) == field_value]
+        return [e for e in events if get_field(e, field_name, None) in field_values]
 
     def get_events_with_field_not_value(
         self,
         field_name: str,
-        field_value: Any,
+        field_values: Any,
         events: List[DictEvent] = None
     ) -> List[DictEvent]:
         """
         Get all events with the given field but not the value.
 
         :param field_name: the name of the field to check
-        :param field_value: the value of the field to check
+        :param field_values: the value(s) of the field to check
         :param events: the events to check (or `None` to check all events)
         :return: the events with the given field:value pair
         """
+        if not isinstance(field_values, list):
+            field_values = [field_values]
         if events is None:
             events = self._events
-        return [e for e in events if get_field(e, field_name, None) != field_value]
+        return [e for e in events if get_field(e, field_name, None) not in field_values]
 
     def are_events_ordered(self, first_event: DictEvent, second_event: DictEvent):
         """