just use .flake8 locally, and make split throw TypeError.

Author: WindSoilder

.flake8

@@ -16,7 +16,7 @@ def raise_error_from_another(out_err, another_err):
 
 
 def test_split_for_none_exception_should_raise_value_error():
-    with pytest.raises(ValueError):
+    with pytest.raises(TypeError):
         matched, unmatched = split(RuntimeError, None)
 
 

exceptiongroup/_tests/test_tools.py

@@ -22,7 +22,7 @@ def split(exc_type, exc, *, match=None):
     value will be tuple of (ExceptionGroup or None, ExceptionGroup or None)
     """
     if not isinstance(exc, BaseException):
-        raise ValueError(
+        raise TypeError(
             "Argument `exc` should be an instance of BaseException."
         )
     if isinstance(exc, ExceptionGroup):