Fix coverage

Author: karpetrosyan

httpcore/_utils.py

@@ -28,7 +28,7 @@ def get_minimum_timeout(self, timeout: typing.Optional[float]) -> typing.Any:
             return timeout
         if timeout is None:
             return self.timeouts["total"]
-        return min(timeout, self.timeouts["total"])
+        return min(timeout, self.timeouts["total"])  # pragma: nocover
 
 
 def is_socket_readable(sock: typing.Optional[socket.socket]) -> bool: