🤡 work around incorrect typeshed annotation for unittest.TestCase

Co-authored-by: Guan Ming(Wesley) Chiu <105915352+guan404ming@users.noreply.github.com>

Author: jorenham

src/numpy-stubs/ma/testutils.pyi

@@ -1,4 +1,4 @@
-from unittest import TestCase
+from unittest import TestCase as _TestCase
 
 import numpy as np
 import numpy.typing as npt
@@ -66,3 +66,6 @@ def assert_mask_equal(m1: object, m2: object, err_msg: str = "") -> None: ...
 
 assert_not_equal = fail_if_equal
 assert_close = assert_almost_equal
+
+class TestCase(_TestCase):
+    def __init_subclass__(cls, *args: object, **kwargs: object) -> None: ...

tool/.mypyignore.txt

@@ -32,4 +32,4 @@ numpy\.testing(\._private\.utils)?\.check_support_sve
 
 # stdlib re-exports with incorrect typeshed stubs
 numpy\.compat(\.py3k)?\.os_PathLike\.__class_getitem__
-numpy\.(testing|ma\.testutils)\.TestCase\.__init_subclass__
+numpy\.testing\.TestCase\.__init_subclass__