no cover __repr__

Author: rmorshea

src/idom/core/layout.py

@@ -611,7 +611,7 @@ def parent(self) -> _ModelState:
         assert parent is not None, "detached model state"
         return parent
 
-    def __repr__(self) -> str:
+    def __repr__(self) -> str:  # pragma: no cover
         return f"ModelState({ {s: getattr(self, s, None) for s in self.__slots__} })"