diff --git a/src/_pytest/monkeypatch.py b/src/_pytest/monkeypatch.py
index 1df864b05..6d63da443 100644
--- a/src/_pytest/monkeypatch.py
+++ b/src/_pytest/monkeypatch.py
@@ -295,7 +295,11 @@ class MonkeyPatch:
         self._setitem.append((dic, name, dic.get(name, notset)))
         dic[name] = value
 
-    def delitem(self, dic: Mapping[K, V], name: K, raising: bool = True,
+    def delitem(
+        self,
+        dic: Mapping[K, V],
+        name: K,
+        raising: bool = True,
     ) -> None:
         """Delete ``name`` from dict.
 
diff --git a/testing/typing_checks.py b/testing/typing_checks.py
index 1f69430ee..765837bb4 100644
--- a/testing/typing_checks.py
+++ b/testing/typing_checks.py
@@ -41,6 +41,7 @@ def check_monkeypatch_typeddict(monkeypatch: MonkeyPatch) -> None:
     class Foo(TypedDict):
         x: int
         y: float
+
     a: Foo = {"x": 1, "y": 3.14}
     monkeypatch.setitem("x", 2)
     monkeypatch.delitem("y")