Adapt code after updating to mypy 1.11

Author: nicoddemus

src/_pytest/_io/pprint.py

@@ -111,15 +111,15 @@ def _format(
             p(self, object, stream, indent, allowance, context, level + 1)
             context.remove(objid)
         elif (
-            _dataclasses.is_dataclass(object)
+            _dataclasses.is_dataclass(object)  # type:ignore[unreachable]
             and not isinstance(object, type)
             and object.__dataclass_params__.repr
             and
             # Check dataclass has generated repr method.
             hasattr(object.__repr__, "__wrapped__")
             and "__create_fn__" in object.__repr__.__wrapped__.__qualname__
         ):
-            context.add(objid)
+            context.add(objid)  # type:ignore[unreachable]
             self._pprint_dataclass(
                 object, stream, indent, allowance, context, level + 1
             )

src/_pytest/capture.py

@@ -202,6 +202,7 @@ def write(self, s: str) -> int:
 class DontReadFromInput(TextIO):
     @property
     def encoding(self) -> str:
+        assert sys.__stdin__ is not None
         return sys.__stdin__.encoding
 
     def read(self, size: int = -1) -> str:

src/_pytest/faulthandler.py

@@ -64,6 +64,7 @@ def get_stderr_fileno() -> int:
         # pytest-xdist monkeypatches sys.stderr with an object that is not an actual file.
         # https://docs.python.org/3/library/faulthandler.html#issue-with-file-descriptors
         # This is potentially dangerous, but the best we can do.
+        assert sys.__stderr__ is not None
         return sys.__stderr__.fileno()
 
 

testing/test_assertion.py

@@ -823,7 +823,7 @@ def __setitem__(self, item, value):
             def __delitem__(self, item):
                 pass
 
-            def insert(self, item, index):
+            def insert(self, index, value):
                 pass
 
         expl = callequal(TestSequence([0, 1]), list([0, 2]))

testing/test_monkeypatch.py

@@ -415,7 +415,7 @@ def test_context() -> None:
     with monkeypatch.context() as m:
         m.setattr(functools, "partial", 3)
         assert not inspect.isclass(functools.partial)
-    assert inspect.isclass(functools.partial)
+    assert inspect.isclass(functools.partial)  # type:ignore[unreachable]
 
 
 def test_context_classmethod() -> None: