Make order check optional for assertMatchingField()

tracetools_test/tracetools_test/case.py

@@ -251,6 +251,7 @@ class TraceTestCase(unittest.TestCase):
         field_name: str,
         matching_event_name: str = None,
         events: List[DictEvent] = None,
+        check_order: bool = True,
     ) -> None:
         """
         Check that the value of a field for a given event has a matching event that follows.
@@ -259,6 +260,7 @@ class TraceTestCase(unittest.TestCase):
         :param field_name: the name of the common field to check
         :param matching_event_name: the name of the event to check (or `None` to check all)
         :param events: the events to check (or `None` to check all in trace)
+        :param check_order: whether to check that the matching event comes after the initial event
         """
         if events is None:
             events = self._events
@@ -276,6 +278,7 @@ class TraceTestCase(unittest.TestCase):
             len(matches),
             1,
             f'no corresponding {field_name}')
+        if check_order:
             # Check order
             # Since matching pairs might repeat, we need to check
             # that there is at least one match that comes after