test_validators.py

from datetime import datetime
from itertools import product
from typing import Dict, List, Optional, Tuple

import pytest

from pydantic import BaseModel, ConfigError, Extra, ValidationError, errors, validator
from pydantic.class_validators import make_generic_validator, root_validator
from pydantic.typing import Literal


def test_simple():
    class Model(BaseModel):
        a: str

        @validator('a')
        def check_a(cls, v):
            if 'foobar' not in v:
                raise ValueError('"foobar" not found in a')
            return v

    assert Model(a='this is foobar good').a == 'this is foobar good'

    with pytest.raises(ValidationError) as exc_info:
        Model(a='snap')
    assert exc_info.value.errors() == [{'loc': ('a',), 'msg': '"foobar" not found in a', 'type': 'value_error'}]


def test_int_validation():
    class Model(BaseModel):
        a: int

    with pytest.raises(ValidationError) as exc_info:
        Model(a='snap')
    assert exc_info.value.errors() == [
        {'loc': ('a',), 'msg': 'value is not a valid integer', 'type': 'type_error.integer'}
    ]
    assert Model(a=3).a == 3
    assert Model(a=True).a == 1
    assert Model(a=False).a == 0
    assert Model(a=4.5).a == 4


def test_frozenset_validation():
    class Model(BaseModel):
        a: frozenset

    with pytest.raises(ValidationError) as exc_info:
        Model(a='snap')
    assert exc_info.value.errors() == [
        {'loc': ('a',), 'msg': 'value is not a valid frozenset', 'type': 'type_error.frozenset'}
    ]
    assert Model(a={1, 2, 3}).a == frozenset({1, 2, 3})
    assert Model(a=frozenset({1, 2, 3})).a == frozenset({1, 2, 3})
    assert Model(a=[4, 5]).a == frozenset({4, 5})
    assert Model(a=(6,)).a == frozenset({6})


def test_validate_whole():
    class Model(BaseModel):
        a: List[int]

        @validator('a', pre=True)
        def check_a1(cls, v):
            v.append('123')
            return v

        @validator('a')
        def check_a2(cls, v):
            v.append(456)
            return v

    assert Model(a=[1, 2]).a == [1, 2, 123, 456]


def test_validate_kwargs():
    class Model(BaseModel):
        b: int
        a: List[int]

        @validator('a', each_item=True)
        def check_a1(cls, v, values, **kwargs):
            return v + values['b']

    assert Model(a=[1, 2], b=6).a == [7, 8]


def test_validate_pre_error():
    calls = []

    class Model(BaseModel):
        a: List[int]

        @validator('a', pre=True)
        def check_a1(cls, v):
            calls.append(f'check_a1 {v}')
            if 1 in v:
                raise ValueError('a1 broken')
            v[0] += 1
            return v

        @validator('a')
        def check_a2(cls, v):
            calls.append(f'check_a2 {v}')
            if 10 in v:
                raise ValueError('a2 broken')
            return v

    assert Model(a=[3, 8]).a == [4, 8]
    assert calls == ['check_a1 [3, 8]', 'check_a2 [4, 8]']

    calls = []
    with pytest.raises(ValidationError) as exc_info:
        Model(a=[1, 3])
    assert exc_info.value.errors() == [{'loc': ('a',), 'msg': 'a1 broken', 'type': 'value_error'}]
    assert calls == ['check_a1 [1, 3]']

    calls = []
    with pytest.raises(ValidationError) as exc_info:
        Model(a=[5, 10])
    assert exc_info.value.errors() == [{'loc': ('a',), 'msg': 'a2 broken', 'type': 'value_error'}]
    assert calls == ['check_a1 [5, 10]', 'check_a2 [6, 10]']


class ValidateAssignmentModel(BaseModel):
    a: int = 4
    b: str = ...
    c: int = 0

    @validator('b')
    def b_length(cls, v, values, **kwargs):
        if 'a' in values and len(v) < values['a']:
            raise ValueError('b too short')
        return v

    @validator('c')
    def double_c(cls, v):
        return v * 2

    class Config:
        validate_assignment = True
        extra = Extra.allow


def test_validating_assignment_ok():
    p = ValidateAssignmentModel(b='hello')
    assert p.b == 'hello'


def test_validating_assignment_fail():
    with pytest.raises(ValidationError):
        ValidateAssignmentModel(a=10, b='hello')

    p = ValidateAssignmentModel(b='hello')
    with pytest.raises(ValidationError):
        p.b = 'x'


def test_validating_assignment_value_change():
    p = ValidateAssignmentModel(b='hello', c=2)
    assert p.c == 4

    p = ValidateAssignmentModel(b='hello')
    assert p.c == 0
    p.c = 3
    assert p.c == 6


def test_validating_assignment_extra():
    p = ValidateAssignmentModel(b='hello', extra_field=1.23)
    assert p.extra_field == 1.23

    p = ValidateAssignmentModel(b='hello')
    p.extra_field = 1.23
    assert p.extra_field == 1.23
    p.extra_field = 'bye'
    assert p.extra_field == 'bye'


def test_validating_assignment_dict():
    with pytest.raises(ValidationError) as exc_info:
        ValidateAssignmentModel(a='x', b='xx')
    assert exc_info.value.errors() == [
        {'loc': ('a',), 'msg': 'value is not a valid integer', 'type': 'type_error.integer'}
    ]


def test_validate_multiple():
    # also test TypeError
    class Model(BaseModel):
        a: str
        b: str

        @validator('a', 'b')
        def check_a_and_b(cls, v, field, **kwargs):
            if len(v) < 4:
                raise TypeError(f'{field.alias} is too short')
            return v + 'x'

    assert Model(a='1234', b='5678').dict() == {'a': '1234x', 'b': '5678x'}

    with pytest.raises(ValidationError) as exc_info:
        Model(a='x', b='x')
    assert exc_info.value.errors() == [
        {'loc': ('a',), 'msg': 'a is too short', 'type': 'type_error'},
        {'loc': ('b',), 'msg': 'b is too short', 'type': 'type_error'},
    ]


def test_classmethod():
    class Model(BaseModel):
        a: str

        @validator('a')
        def check_a(cls, v):
            assert cls is Model
            return v

    m = Model(a='this is foobar good')
    assert m.a == 'this is foobar good'
    m.check_a('x')


def test_duplicates():
    with pytest.raises(errors.ConfigError) as exc_info:

        class Model(BaseModel):
            a: str
            b: str

            @validator('a')
            def duplicate_name(cls, v):
                return v

            @validator('b')  # noqa
            def duplicate_name(cls, v):  # noqa
                return v

    assert str(exc_info.value) == (
        'duplicate validator function '
        '"tests.test_validators.test_duplicates.<locals>.Model.duplicate_name"; '
        'if this is intended, set `allow_reuse=True`'
    )


def test_use_bare():
    with pytest.raises(errors.ConfigError) as exc_info:

        class Model(BaseModel):
            a: str

            @validator
            def checker(cls, v):
                return v

    assert 'validators should be used with fields' in str(exc_info.value)


def test_use_no_fields():
    with pytest.raises(errors.ConfigError) as exc_info:

        class Model(BaseModel):
            a: str

            @validator()
            def checker(cls, v):
                return v

    assert 'validator with no fields specified' in str(exc_info.value)


def test_validate_always():
    check_calls = 0

    class Model(BaseModel):
        a: str = None

        @validator('a', pre=True, always=True)
        def check_a(cls, v):
            nonlocal check_calls
            check_calls += 1
            return v or 'xxx'

    assert Model().a == 'xxx'
    assert check_calls == 1
    assert Model(a='y').a == 'y'
    assert check_calls == 2


def test_validate_not_always():
    check_calls = 0

    class Model(BaseModel):
        a: str = None

        @validator('a', pre=True)
        def check_a(cls, v):
            nonlocal check_calls
            check_calls += 1
            return v or 'xxx'

    assert Model().a is None
    assert check_calls == 0
    assert Model(a='y').a == 'y'
    assert check_calls == 1


def test_wildcard_validators():
    calls = []

    class Model(BaseModel):
        a: str
        b: int

        @validator('a')
        def check_a(cls, v, field, **kwargs):
            calls.append(('check_a', v, field.name))
            return v

        @validator('*')
        def check_all(cls, v, field, **kwargs):
            calls.append(('check_all', v, field.name))
            return v

    assert Model(a='abc', b='123').dict() == dict(a='abc', b=123)
    assert calls == [('check_a', 'abc', 'a'), ('check_all', 'abc', 'a'), ('check_all', 123, 'b')]


def test_wildcard_validator_error():
    class Model(BaseModel):
        a: str
        b: str

        @validator('*')
        def check_all(cls, v, field, **kwargs):
            if 'foobar' not in v:
                raise ValueError('"foobar" not found in a')
            return v

    assert Model(a='foobar a', b='foobar b').b == 'foobar b'

    with pytest.raises(ValidationError) as exc_info:
        Model(a='snap')
    assert exc_info.value.errors() == [
        {'loc': ('a',), 'msg': '"foobar" not found in a', 'type': 'value_error'},
        {'loc': ('b',), 'msg': 'field required', 'type': 'value_error.missing'},
    ]


def test_invalid_field():
    with pytest.raises(errors.ConfigError) as exc_info:

        class Model(BaseModel):
            a: str

            @validator('b')
            def check_b(cls, v):
                return v

    assert str(exc_info.value) == (
        "Validators defined with incorrect fields: check_b "  # noqa: Q000
        "(use check_fields=False if you're inheriting from the model and intended this)"
    )


def test_validate_child():
    class Parent(BaseModel):
        a: str

    class Child(Parent):
        @validator('a')
        def check_a(cls, v):
            if 'foobar' not in v:
                raise ValueError('"foobar" not found in a')
            return v

    assert Parent(a='this is not a child').a == 'this is not a child'
    assert Child(a='this is foobar good').a == 'this is foobar good'
    with pytest.raises(ValidationError):
        Child(a='snap')


def test_validate_child_extra():
    class Parent(BaseModel):
        a: str

        @validator('a')
        def check_a_one(cls, v):
            if 'foobar' not in v:
                raise ValueError('"foobar" not found in a')
            return v

    class Child(Parent):
        @validator('a')
        def check_a_two(cls, v):
            return v.upper()

    assert Parent(a='this is foobar good').a == 'this is foobar good'
    assert Child(a='this is foobar good').a == 'THIS IS FOOBAR GOOD'
    with pytest.raises(ValidationError):
        Child(a='snap')


def test_validate_child_all():
    class Parent(BaseModel):
        a: str

    class Child(Parent):
        @validator('*')
        def check_a(cls, v):
            if 'foobar' not in v:
                raise ValueError('"foobar" not found in a')
            return v

    assert Parent(a='this is not a child').a == 'this is not a child'
    assert Child(a='this is foobar good').a == 'this is foobar good'
    with pytest.raises(ValidationError):
        Child(a='snap')


def test_validate_parent():
    class Parent(BaseModel):
        a: str

        @validator('a')
        def check_a(cls, v):
            if 'foobar' not in v:
                raise ValueError('"foobar" not found in a')
            return v

    class Child(Parent):
        pass

    assert Parent(a='this is foobar good').a == 'this is foobar good'
    assert Child(a='this is foobar good').a == 'this is foobar good'
    with pytest.raises(ValidationError):
        Parent(a='snap')
    with pytest.raises(ValidationError):
        Child(a='snap')


def test_validate_parent_all():
    class Parent(BaseModel):
        a: str

        @validator('*')
        def check_a(cls, v):
            if 'foobar' not in v:
                raise ValueError('"foobar" not found in a')
            return v

    class Child(Parent):
        pass

    assert Parent(a='this is foobar good').a == 'this is foobar good'
    assert Child(a='this is foobar good').a == 'this is foobar good'
    with pytest.raises(ValidationError):
        Parent(a='snap')
    with pytest.raises(ValidationError):
        Child(a='snap')


def test_inheritance_keep():
    class Parent(BaseModel):
        a: int

        @validator('a')
        def add_to_a(cls, v):
            return v + 1

    class Child(Parent):
        pass

    assert Child(a=0).a == 1


def test_inheritance_replace():
    class Parent(BaseModel):
        a: int

        @validator('a')
        def add_to_a(cls, v):
            return v + 1

    class Child(Parent):
        @validator('a')
        def add_to_a(cls, v):
            return v + 5

    assert Child(a=0).a == 5


def test_inheritance_new():
    class Parent(BaseModel):
        a: int

        @validator('a')
        def add_one_to_a(cls, v):
            return v + 1

    class Child(Parent):
        @validator('a')
        def add_five_to_a(cls, v):
            return v + 5

    assert Child(a=0).a == 6


def test_validation_each_item():
    class Model(BaseModel):
        foobar: Dict[int, int]

        @validator('foobar', each_item=True)
        def check_foobar(cls, v):
            return v + 1

    assert Model(foobar={1: 1}).foobar == {1: 2}


def test_key_validation():
    class Model(BaseModel):
        foobar: Dict[int, int]

        @validator('foobar')
        def check_foobar(cls, value):
            return {k + 1: v + 1 for k, v in value.items()}

    assert Model(foobar={1: 1}).foobar == {2: 2}


def test_validator_always_optional():
    check_calls = 0

    class Model(BaseModel):
        a: Optional[str] = None

        @validator('a', pre=True, always=True)
        def check_a(cls, v):
            nonlocal check_calls
            check_calls += 1
            return v or 'default value'

    assert Model(a='y').a == 'y'
    assert check_calls == 1
    assert Model().a == 'default value'
    assert check_calls == 2


def test_validator_always_pre():
    check_calls = 0

    class Model(BaseModel):
        a: str = None

        @validator('a', always=True, pre=True)
        def check_a(cls, v):
            nonlocal check_calls
            check_calls += 1
            return v or 'default value'

    assert Model(a='y').a == 'y'
    assert Model().a == 'default value'
    assert check_calls == 2


def test_validator_always_post():
    class Model(BaseModel):
        a: str = None

        @validator('a', always=True)
        def check_a(cls, v):
            return v or 'default value'

    assert Model(a='y').a == 'y'
    assert Model().a == 'default value'


def test_validator_always_post_optional():
    class Model(BaseModel):
        a: Optional[str] = None

        @validator('a', always=True, pre=True)
        def check_a(cls, v):
            return v or 'default value'

    assert Model(a='y').a == 'y'
    assert Model().a == 'default value'


def test_datetime_validator():
    check_calls = 0

    class Model(BaseModel):
        d: datetime = None

        @validator('d', pre=True, always=True)
        def check_d(cls, v):
            nonlocal check_calls
            check_calls += 1
            return v or datetime(2032, 1, 1)

    assert Model(d='2023-01-01T00:00:00').d == datetime(2023, 1, 1)
    assert check_calls == 1
    assert Model().d == datetime(2032, 1, 1)
    assert check_calls == 2
    assert Model(d=datetime(2023, 1, 1)).d == datetime(2023, 1, 1)
    assert check_calls == 3


def test_pre_called_once():
    check_calls = 0

    class Model(BaseModel):
        a: Tuple[int, int, int]

        @validator('a', pre=True)
        def check_a(cls, v):
            nonlocal check_calls
            check_calls += 1
            return v

    assert Model(a=['1', '2', '3']).a == (1, 2, 3)
    assert check_calls == 1


@pytest.mark.parametrize(
    'fields,result',
    [
        (['val'], '_v_'),
        (['foobar'], '_v_'),
        (['val', 'field'], '_v_,_field_'),
        (['val', 'config'], '_v_,_config_'),
        (['val', 'values'], '_v_,_values_'),
        (['val', 'field', 'config'], '_v_,_field_,_config_'),
        (['val', 'field', 'values'], '_v_,_field_,_values_'),
        (['val', 'config', 'values'], '_v_,_config_,_values_'),
        (['val', 'field', 'values', 'config'], '_v_,_field_,_values_,_config_'),
        (['cls', 'val'], '_cls_,_v_'),
        (['cls', 'foobar'], '_cls_,_v_'),
        (['cls', 'val', 'field'], '_cls_,_v_,_field_'),
        (['cls', 'val', 'config'], '_cls_,_v_,_config_'),
        (['cls', 'val', 'values'], '_cls_,_v_,_values_'),
        (['cls', 'val', 'field', 'config'], '_cls_,_v_,_field_,_config_'),
        (['cls', 'val', 'field', 'values'], '_cls_,_v_,_field_,_values_'),
        (['cls', 'val', 'config', 'values'], '_cls_,_v_,_config_,_values_'),
        (['cls', 'val', 'field', 'values', 'config'], '_cls_,_v_,_field_,_values_,_config_'),
    ],
)
def test_make_generic_validator(fields, result):
    exec(f"""def testing_function({', '.join(fields)}): return {' + "," + '.join(fields)}""")
    func = locals()['testing_function']
    validator = make_generic_validator(func)
    assert validator.__qualname__ == 'testing_function'
    assert validator.__name__ == 'testing_function'
    # args: cls, v, values, field, config
    assert validator('_cls_', '_v_', '_values_', '_field_', '_config_') == result


def test_make_generic_validator_kwargs():
    def test_validator(v, **kwargs):
        return ', '.join(f'{k}: {v}' for k, v in kwargs.items())

    validator = make_generic_validator(test_validator)
    assert validator.__name__ == 'test_validator'
    assert validator('_cls_', '_v_', '_vs_', '_f_', '_c_') == 'values: _vs_, field: _f_, config: _c_'


def test_make_generic_validator_invalid():
    def test_validator(v, foobar):
        return foobar

    with pytest.raises(ConfigError) as exc_info:
        make_generic_validator(test_validator)
    assert ': (v, foobar), should be: (value, values, config, field)' in str(exc_info.value)


def test_make_generic_validator_cls_kwargs():
    def test_validator(cls, v, **kwargs):
        return ', '.join(f'{k}: {v}' for k, v in kwargs.items())

    validator = make_generic_validator(test_validator)
    assert validator.__name__ == 'test_validator'
    assert validator('_cls_', '_v_', '_vs_', '_f_', '_c_') == 'values: _vs_, field: _f_, config: _c_'


def test_make_generic_validator_cls_invalid():
    def test_validator(cls, v, foobar):
        return foobar

    with pytest.raises(ConfigError) as exc_info:
        make_generic_validator(test_validator)
    assert ': (cls, v, foobar), should be: (cls, value, values, config, field)' in str(exc_info.value)


def test_make_generic_validator_self():
    def test_validator(self, v):
        return v

    with pytest.raises(ConfigError) as exc_info:
        make_generic_validator(test_validator)
    assert ': (self, v), "self" not permitted as first argument, should be: (cls, value' in str(exc_info.value)


def test_assert_raises_validation_error():
    class Model(BaseModel):
        a: str

        @validator('a')
        def check_a(cls, v):
            assert v == 'a', 'invalid a'
            return v

    Model(a='a')

    with pytest.raises(ValidationError) as exc_info:
        Model(a='snap')
    injected_by_pytest = "\nassert 'snap' == 'a'\n  - a\n  + snap"
    assert exc_info.value.errors() == [
        {'loc': ('a',), 'msg': f'invalid a{injected_by_pytest}', 'type': 'assertion_error'}
    ]


def test_whole():
    with pytest.warns(DeprecationWarning, match='The "whole" keyword argument is deprecated'):

        class Model(BaseModel):
            x: List[int]

            @validator('x', whole=True)
            def check_something(cls, v):
                return v


def test_root_validator():
    root_val_values = []

    class Model(BaseModel):
        a: int = 1
        b: str
        c: str

        @validator('b')
        def repeat_b(cls, v):
            return v * 2

        @root_validator
        def example_root_validator(cls, values):
            root_val_values.append(values)
            if 'snap' in values.get('b', ''):
                raise ValueError('foobar')
            return dict(values, b='changed')

        @root_validator
        def example_root_validator2(cls, values):
            root_val_values.append(values)
            if 'snap' in values.get('c', ''):
                raise ValueError('foobar2')
            return dict(values, c='changed')

    assert Model(a='123', b='bar', c='baz').dict() == {'a': 123, 'b': 'changed', 'c': 'changed'}

    with pytest.raises(ValidationError) as exc_info:
        Model(b='snap dragon', c='snap dragon2')
    assert exc_info.value.errors() == [
        {'loc': ('__root__',), 'msg': 'foobar', 'type': 'value_error'},
        {'loc': ('__root__',), 'msg': 'foobar2', 'type': 'value_error'},
    ]

    with pytest.raises(ValidationError) as exc_info:
        Model(a='broken', b='bar', c='baz')
    assert exc_info.value.errors() == [
        {'loc': ('a',), 'msg': 'value is not a valid integer', 'type': 'type_error.integer'}
    ]

    assert root_val_values == [
        {'a': 123, 'b': 'barbar', 'c': 'baz'},
        {'a': 123, 'b': 'changed', 'c': 'baz'},
        {'a': 1, 'b': 'snap dragonsnap dragon', 'c': 'snap dragon2'},
        {'a': 1, 'b': 'snap dragonsnap dragon', 'c': 'snap dragon2'},
        {'b': 'barbar', 'c': 'baz'},
        {'b': 'changed', 'c': 'baz'},
    ]


def test_root_validator_pre():
    root_val_values = []

    class Model(BaseModel):
        a: int = 1
        b: str

        @validator('b')
        def repeat_b(cls, v):
            return v * 2

        @root_validator(pre=True)
        def root_validator(cls, values):
            root_val_values.append(values)
            if 'snap' in values.get('b', ''):
                raise ValueError('foobar')
            return {'a': 42, 'b': 'changed'}

    assert Model(a='123', b='bar').dict() == {'a': 42, 'b': 'changedchanged'}

    with pytest.raises(ValidationError) as exc_info:
        Model(b='snap dragon')

    assert root_val_values == [{'a': '123', 'b': 'bar'}, {'b': 'snap dragon'}]
    assert exc_info.value.errors() == [{'loc': ('__root__',), 'msg': 'foobar', 'type': 'value_error'}]


def test_root_validator_repeat():
    with pytest.raises(errors.ConfigError, match='duplicate validator function'):

        class Model(BaseModel):
            a: int = 1

            @root_validator
            def root_validator_repeated(cls, values):
                return values

            @root_validator  # noqa: F811
            def root_validator_repeated(cls, values):  # noqa: F811
                return values


def test_root_validator_repeat2():
    with pytest.raises(errors.ConfigError, match='duplicate validator function'):

        class Model(BaseModel):
            a: int = 1

            @validator('a')
            def repeat_validator(cls, v):
                return v

            @root_validator(pre=True)  # noqa: F811
            def repeat_validator(cls, values):  # noqa: F811
                return values


def test_root_validator_self():
    with pytest.raises(
        errors.ConfigError, match=r'Invalid signature for root validator root_validator: \(self, values\)'
    ):

        class Model(BaseModel):
            a: int = 1

            @root_validator
            def root_validator(self, values):
                return values


def test_root_validator_extra():
    with pytest.raises(errors.ConfigError) as exc_info:

        class Model(BaseModel):
            a: int = 1

            @root_validator
            def root_validator(cls, values, another):
                return values

    assert str(exc_info.value) == (
        'Invalid signature for root validator root_validator: (cls, values, another), should be: (cls, values).'
    )


def test_root_validator_types():
    root_val_values = None

    class Model(BaseModel):
        a: int = 1
        b: str

        @root_validator
        def root_validator(cls, values):
            nonlocal root_val_values
            root_val_values = cls, values
            return values

        class Config:
            extra = Extra.allow

    assert Model(b='bar', c='wobble').dict() == {'a': 1, 'b': 'bar', 'c': 'wobble'}

    assert root_val_values == (Model, {'a': 1, 'b': 'bar', 'c': 'wobble'})


def test_root_validator_inheritance():
    calls = []

    class Parent(BaseModel):
        pass

        @root_validator
        def root_validator_parent(cls, values):
            calls.append(f'parent validator: {values}')
            return {'extra1': 1, **values}

    class Child(Parent):
        a: int

        @root_validator
        def root_validator_child(cls, values):
            calls.append(f'child validator: {values}')
            return {'extra2': 2, **values}

    assert len(Child.__post_root_validators__) == 2
    assert len(Child.__pre_root_validators__) == 0
    assert Child(a=123).dict() == {'extra2': 2, 'extra1': 1, 'a': 123}
    assert calls == ["parent validator: {'a': 123}", "child validator: {'extra1': 1, 'a': 123}"]


def reusable_validator(num):
    return num * 2


def test_reuse_global_validators():
    class Model(BaseModel):
        x: int
        y: int

        double_x = validator('x', allow_reuse=True)(reusable_validator)
        double_y = validator('y', allow_reuse=True)(reusable_validator)

    assert dict(Model(x=1, y=1)) == {'x': 2, 'y': 2}


def declare_with_reused_validators(include_root, allow_1, allow_2, allow_3):
    class Model(BaseModel):
        a: str
        b: str

        @validator('a', allow_reuse=allow_1)
        def duplicate_name(cls, v):
            return v

        @validator('b', allow_reuse=allow_2)  # noqa F811
        def duplicate_name(cls, v):  # noqa F811
            return v

        if include_root:

            @root_validator(allow_reuse=allow_3)  # noqa F811
            def duplicate_name(cls, values):  # noqa F811
                return values


@pytest.fixture
def reset_tracked_validators():
    from pydantic.class_validators import _FUNCS

    original_tracked_validators = set(_FUNCS)
    yield
    _FUNCS.clear()
    _FUNCS.update(original_tracked_validators)


@pytest.mark.parametrize('include_root,allow_1,allow_2,allow_3', product(*[[True, False]] * 4))
def test_allow_reuse(include_root, allow_1, allow_2, allow_3, reset_tracked_validators):
    duplication_count = int(not allow_1) + int(not allow_2) + int(include_root and not allow_3)
    if duplication_count > 1:
        with pytest.raises(ConfigError) as exc_info:
            declare_with_reused_validators(include_root, allow_1, allow_2, allow_3)
        assert str(exc_info.value).startswith('duplicate validator function')
    else:
        declare_with_reused_validators(include_root, allow_1, allow_2, allow_3)


@pytest.mark.parametrize('validator_classmethod,root_validator_classmethod', product(*[[True, False]] * 2))
def test_root_validator_classmethod(validator_classmethod, root_validator_classmethod, reset_tracked_validators):
    root_val_values = []

    class Model(BaseModel):
        a: int = 1
        b: str

        def repeat_b(cls, v):
            return v * 2

        if validator_classmethod:
            repeat_b = classmethod(repeat_b)
        repeat_b = validator('b')(repeat_b)

        def example_root_validator(cls, values):
            root_val_values.append(values)
            if 'snap' in values.get('b', ''):
                raise ValueError('foobar')
            return dict(values, b='changed')

        if root_validator_classmethod:
            example_root_validator = classmethod(example_root_validator)
        example_root_validator = root_validator(example_root_validator)

    assert Model(a='123', b='bar').dict() == {'a': 123, 'b': 'changed'}

    with pytest.raises(ValidationError) as exc_info:
        Model(b='snap dragon')
    assert exc_info.value.errors() == [{'loc': ('__root__',), 'msg': 'foobar', 'type': 'value_error'}]

    with pytest.raises(ValidationError) as exc_info:
        Model(a='broken', b='bar')
    assert exc_info.value.errors() == [
        {'loc': ('a',), 'msg': 'value is not a valid integer', 'type': 'type_error.integer'}
    ]

    assert root_val_values == [{'a': 123, 'b': 'barbar'}, {'a': 1, 'b': 'snap dragonsnap dragon'}, {'b': 'barbar'}]


def test_root_validator_skip_on_failure():
    a_called = False

    class ModelA(BaseModel):
        a: int

        @root_validator
        def example_root_validator(cls, values):
            nonlocal a_called
            a_called = True

    with pytest.raises(ValidationError):
        ModelA(a='a')
    assert a_called
    b_called = False

    class ModelB(BaseModel):
        a: int

        @root_validator(skip_on_failure=True)
        def example_root_validator(cls, values):
            nonlocal b_called
            b_called = True

    with pytest.raises(ValidationError):
        ModelB(a='a')
    assert not b_called


def test_assignment_validator_cls():
    validator_calls = 0

    class Model(BaseModel):
        name: str

        class Config:
            validate_assignment = True

        @validator('name')
        def check_foo(cls, value):
            nonlocal validator_calls
            validator_calls += 1
            assert cls == Model
            return value

    m = Model(name='hello')
    m.name = 'goodbye'
    assert validator_calls == 2


@pytest.mark.skipif(not Literal, reason='typing_extensions not installed')
def test_literal_validator():
    class Model(BaseModel):
        a: Literal['foo']

    Model(a='foo')

    with pytest.raises(ValidationError) as exc_info:
        Model(a='nope')
    assert exc_info.value.errors() == [
        {
            'loc': ('a',),
            'msg': "unexpected value; permitted: 'foo'",
            'type': 'value_error.const',
            'ctx': {'given': 'nope', 'permitted': ('foo',)},
        }
    ]


@pytest.mark.skipif(not Literal, reason='typing_extensions not installed')
def test_nested_literal_validator():
    L1 = Literal['foo']
    L2 = Literal['bar']

    class Model(BaseModel):
        a: Literal[L1, L2]

    Model(a='foo')

    with pytest.raises(ValidationError) as exc_info:
        Model(a='nope')
    assert exc_info.value.errors() == [
        {
            'loc': ('a',),
            'msg': "unexpected value; permitted: 'foo', 'bar'",
            'type': 'value_error.const',
            'ctx': {'given': 'nope', 'permitted': ('foo', 'bar')},
        }
    ]