Warn on error handlers returning a different code to their exception.

Signed-off-by: Laura <l@veriny.tf>

kyoukai/app.py

@@ -221,6 +221,11 @@ async def handle_httpexception(self, ctx: HTTPRequestContext, exception: HTTPExc
                 # else:
                 # result = wrap_response(result, self.response_class)
 
+            if result.status_code != exception.code:
+                logger.warning("Error handler {} returned code {} when exception was code {}..."
+                               .format(error_handler.callable_repr, result.status_code,
+                                       exception.code))
+
             return result
 
     async def process_request(self, request: Request, parent_context: Context) -> Response:

kyoukai/route.py

@@ -62,6 +62,10 @@ def __init__(self, function, *,
         #: Our own specific hooks.
         self.hooks = {}
 
+    @property
+    def callable_repr(self):
+        return repr(self._callable)
+
     def add_path(self, url: str, methods: typing.Sequence[str] = ("GET", "HEAD")):
         """
         Adds a path to the current set of paths for this route.