fix rabbit method name

Author: giancarloromeo

packages/service-library/src/servicelib/rabbitmq/_models.py

@@ -24,7 +24,7 @@ def routing_key(self) -> str | None:
 class RPCNamespacedMethodName(ConstrainedStr):
     min_length: int = 1
     max_length: int = 255
-    regex: re.Pattern[str] | None = re.compile(REGEX_RABBIT_QUEUE_ALLOWED_SYMBOLS)
+    pattern: str = REGEX_RABBIT_QUEUE_ALLOWED_SYMBOLS
 
     @classmethod
     def from_namespace_and_method(

packages/service-library/tests/rabbitmq/test_rabbitmq_rpc.py

@@ -350,11 +350,12 @@ async def _a_handler() -> None:
         pass
 
     if expect_fail:
-        with pytest.raises(ValidationError) as exec_info:
+        with pytest.raises(
+            ValidationError, match=r"String should have at most \d+ characters"
+        ):
             await rpc_server.register_handler(
                 RPCNamespace("a"), RPCMethodName(handler_name), _a_handler
             )
-        assert "String should have at most 252 characters" in f"{exec_info.value}"
     else:
         await rpc_server.register_handler(
             RPCNamespace("a"), RPCMethodName(handler_name), _a_handler