fix: fix test cases

Author: sudosubin

ext/setup.py

@@ -1,7 +1,5 @@
 #!/usr/bin/env python
-from distutils.core import setup
-
-from setuptools import find_packages
+from setuptools import find_packages, setup  # type: ignore[import-untyped]
 
 with open("README.md") as f:
     readme = f.read()

tests/typecheck/test_config.yml

@@ -63,3 +63,5 @@
             content: |
                 def extra_fn() -> None:
                   pass
+    env:
+        -   MYPYPATH=./extras