Fix test

Author: Viicos

python/pydantic_core/core_schema.py

@@ -4251,6 +4251,7 @@ def definition_reference_schema(
     'value_error',
     'assertion_error',
     'literal_error',
+    'unset_sentinel_error',
     'date_type',
     'date_parsing',
     'date_from_datetime_parsing',

tests/test_errors.py

@@ -340,6 +340,7 @@ def f(input_value, info):
     ('assertion_error', 'Assertion failed, foobar', {'error': AssertionError('foobar')}),
     ('literal_error', 'Input should be foo', {'expected': 'foo'}),
     ('literal_error', 'Input should be foo or bar', {'expected': 'foo or bar'}),
+    ('unset_sentinel_error', "Input should be the 'UNSET' sentinel", None),
     ('date_type', 'Input should be a valid date', None),
     ('date_parsing', 'Input should be a valid date in the format YYYY-MM-DD, foobar', {'error': 'foobar'}),
     ('date_from_datetime_parsing', 'Input should be a valid date or datetime, foobar', {'error': 'foobar'}),

tests/test_schema_functions.py

@@ -82,6 +82,7 @@ def args(*args, **kwargs):
         {'type': 'timedelta', 'microseconds_precision': 'error'},
     ),
     (core_schema.literal_schema, args(['a', 'b']), {'type': 'literal', 'expected': ['a', 'b']}),
+    (core_schema.unset_sentinel_schema, args(), {'type': 'unset-sentinel'}),
     (
         core_schema.enum_schema,
         args(MyEnum, list(MyEnum.__members__.values())),