pydantic/tests/test_dataclasses.py

import dataclasses

import pytest

import pydantic
from pydantic import BaseModel, ValidationError


def test_simple():
    @pydantic.dataclasses.dataclass
    class MyDataclass:
        a: int
        b: float

    d = MyDataclass('1', '2.5')
    assert d.a == 1
    assert d.b == 2.5
    d = MyDataclass(b=10, a=20)
    assert d.a == 20
    assert d.b == 10


def test_value_error():
    @pydantic.dataclasses.dataclass
    class MyDataclass:
        a: int
        b: int

    with pytest.raises(ValidationError) as exc_info:
        MyDataclass(1, 'wrong')

    assert exc_info.value.errors() == [
        {'loc': ('b',), 'msg': 'value is not a valid integer', 'type': 'type_error.integer'}
    ]


def test_frozen():
    @pydantic.dataclasses.dataclass(frozen=True)
    class MyDataclass:
        a: int

    d = MyDataclass(1)
    assert d.a == 1

    with pytest.raises(AttributeError):
        d.a = 7


def test_validate_assignment():
    class Config:
        validate_assignment = True

    @pydantic.dataclasses.dataclass(config=Config)
    class MyDataclass:
        a: int

    d = MyDataclass(1)
    assert d.a == 1

    d.a = '7'
    assert d.a == 7


def test_validate_assignment_error():
    class Config:
        validate_assignment = True

    @pydantic.dataclasses.dataclass(config=Config)
    class MyDataclass:
        a: int

    d = MyDataclass(1)

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


def test_not_validate_assignment():
    @pydantic.dataclasses.dataclass
    class MyDataclass:
        a: int

    d = MyDataclass(1)
    assert d.a == 1

    d.a = '7'
    assert d.a == '7'


def test_post_init():
    post_init_called = False

    @pydantic.dataclasses.dataclass
    class MyDataclass:
        a: int

        def __post_init__(self):
            nonlocal post_init_called
            post_init_called = True

    d = MyDataclass('1')
    assert d.a == 1
    assert post_init_called


def test_inheritance():
    @pydantic.dataclasses.dataclass
    class A:
        a: str = None

    @pydantic.dataclasses.dataclass
    class B(A):
        b: int = None

    b = B(a='a', b=12)
    assert b.a == 'a'
    assert b.b == 12

    with pytest.raises(ValidationError):
        B(a='a', b='b')


def test_validate_long_string_error():
    class Config:
        max_anystr_length = 3

    @pydantic.dataclasses.dataclass(config=Config)
    class MyDataclass:
        a: str

    with pytest.raises(ValidationError) as exc_info:
        MyDataclass('xxxx')

    assert exc_info.value.errors() == [
        {
            'loc': ('a',),
            'msg': 'ensure this value has at most 3 characters',
            'type': 'value_error.any_str.max_length',
            'ctx': {'limit_value': 3},
        }
    ]


def test_validate_assigment_long_string_error():
    class Config:
        max_anystr_length = 3
        validate_assignment = True

    @pydantic.dataclasses.dataclass(config=Config)
    class MyDataclass:
        a: str

    d = MyDataclass('xxx')
    with pytest.raises(ValidationError) as exc_info:
        d.a = 'xxxx'

    assert issubclass(MyDataclass.__pydantic_model__.__config__, BaseModel.Config)
    assert exc_info.value.errors() == [
        {
            'loc': ('a',),
            'msg': 'ensure this value has at most 3 characters',
            'type': 'value_error.any_str.max_length',
            'ctx': {'limit_value': 3},
        }
    ]


def test_no_validate_assigment_long_string_error():
    class Config:
        max_anystr_length = 3
        validate_assignment = False

    @pydantic.dataclasses.dataclass(config=Config)
    class MyDataclass:
        a: str

    d = MyDataclass('xxx')
    d.a = 'xxxx'

    assert d.a == 'xxxx'


def test_nested_dataclass():
    @pydantic.dataclasses.dataclass
    class Nested:
        number: int

    @pydantic.dataclasses.dataclass
    class Outer:
        n: Nested

    navbar = Outer(n=Nested(number='1'))
    assert isinstance(navbar.n, Nested)
    assert navbar.n.number == 1

    navbar = Outer(n=('2',))
    assert isinstance(navbar.n, Nested)
    assert navbar.n.number == 2

    navbar = Outer(n={'number': '3'})
    assert isinstance(navbar.n, Nested)
    assert navbar.n.number == 3

    with pytest.raises(ValidationError) as exc_info:
        Outer(n='not nested')
    assert exc_info.value.errors() == [
        {
            'loc': ('n',),
            'msg': 'instance of Nested, tuple or dict expected',
            'type': 'type_error.dataclass',
            'ctx': {'class_name': 'Nested'},
        }
    ]

    with pytest.raises(ValidationError) as exc_info:
        Outer(n=('x',))
    assert exc_info.value.errors() == [
        {'loc': ('n', 'number'), 'msg': 'value is not a valid integer', 'type': 'type_error.integer'}
    ]


def test_arbitrary_types_allowed():
    @dataclasses.dataclass
    class Button:
        href: str

    class Config:
        arbitrary_types_allowed = True

    @pydantic.dataclasses.dataclass(config=Config)
    class Navbar:
        button: Button

    btn = Button(href='a')
    navbar = Navbar(button=btn)
    assert navbar.button.href == 'a'

    with pytest.raises(ValidationError) as exc_info:
        Navbar(button=('b',))
    assert exc_info.value.errors() == [
        {
            'loc': ('button',),
            'msg': 'instance of Button expected',
            'type': 'type_error.arbitrary_type',
            'ctx': {'expected_arbitrary_type': 'Button'},
        }
    ]


def test_nested_dataclass_model():
    @pydantic.dataclasses.dataclass
    class Nested:
        number: int

    class Outer(BaseModel):
        n: Nested

    navbar = Outer(n=Nested(number='1'))
    assert navbar.n.number == 1