fix tests

Author: changhc

python/pydantic_core/core_schema.py

@@ -3876,7 +3876,8 @@ def never_schema(
     from pydantic_core import SchemaValidator, core_schema
 
     schema = core_schema.never_schema()
-    v = SchemaValidator(schema) # should always fail
+    v = SchemaValidator(schema)
+    # Validation should always fail
     try:
         assert v.validate_python(1)
     except ValidationError:

tests/test_errors.py

@@ -410,6 +410,7 @@ def f(input_value, info):
         'Input should be a valid complex string following the rules at https://docs.python.org/3/library/functions.html#complex',
         None,
     ),
+    ('never', 'Unexpected input for a field that should never be filled', None),
 ]