fix: revert bad factor

Signed-off-by: Élie Goudout <[email protected]>

Author: eliegoudout

test/paramclasses/test_signature.py

@@ -153,17 +153,19 @@ def test_signature_call_non_unpackable(
 
     accepts_args = pos_only or pos_or_kw or var_pos
     accepts_kwargs = pos_or_kw or kw_only or var_kw
-    # >=3.15.0a2-compatible message (python/cpython/pull/136395)
-    msg = " after * must be an iterable, not NoneType"
 
     # Non-unpackable ``args``
     if accepts_args:
+        # >=3.15.0a2-compatible message (python/cpython/pull/136395)
+        msg = " after * must be an iterable, not NoneType"
         args_kwargs = [None, {}] if accepts_kwargs else [None]
         with pytest.raises(TypeError, match=f"{re.escape(msg)}$"):
             ParamWithPostInit(*args_kwargs)
 
     # Non-unpackable ``kwargs``
     if accepts_kwargs:
+        # >=3.15.0a2-compatible message (python/cpython/pull/136395)
+        msg = " after ** must be a mapping, not NoneType"
         args_kwargs = [[], None] if accepts_args else [None]
         with pytest.raises(TypeError, match=f"{re.escape(msg)}$"):
             ParamWithPostInit(*args_kwargs)