pydantic/tests/test_abc.py

import abc

import pytest

from pydantic import BaseModel


def test_model_subclassing_abstract_base_classes():
    class Model(BaseModel, abc.ABC):
        some_field: str


def test_model_subclassing_abstract_base_classes_without_implementation_raises_exception():
    class Model(BaseModel, abc.ABC):
        some_field: str

        @abc.abstractmethod
        def my_abstract_method(self):
            pass

        @classmethod
        @abc.abstractmethod
        def my_abstract_classmethod(cls):
            pass

        @staticmethod
        @abc.abstractmethod
        def my_abstract_staticmethod():
            pass

        @property
        @abc.abstractmethod
        def my_abstract_property(self):
            pass

        @my_abstract_property.setter
        @abc.abstractmethod
        def my_abstract_property(self, val):
            pass

    with pytest.raises(TypeError) as excinfo:
        Model(some_field='some_value')
    assert str(excinfo.value) == "Can't instantiate abstract class Model with abstract methods" \
        " my_abstract_classmethod, my_abstract_method, my_abstract_property, my_abstract_staticmethod"