def serialize_a_uuid(self, v):
            return str(v)

    @app.get("/get_custom_class")
    def return_some_user():
        # Test that the fix also works for custom pydantic classes
        return SomeCustomClass(a_uuid=MyUuid("b8799909-f914-42de-91bc-95c819218d01"))

    client = TestClient(app)

    with client:
        response_simple = client.get("/fast_uuid")

/// tip

If you need GraphQL, I still would recommend you check out <a href="https://strawberry.rocks/" class="external-link" target="_blank">Strawberry</a>, as it's based on type annotations instead of custom classes and types.

///

## Learn More { #learn-more }

You can learn more about **GraphQL** in the <a href="https://graphql.org/" class="external-link" target="_blank">official GraphQL documentation</a>.

    app = FastAPI()

    with pytest.raises(PydanticV1NotSupportedError):

        @app.post("/param")
        def endpoint(data: ParamModelV1):  # pragma: no cover
            return data


def test_raises_pydantic_v1_model_in_return_type() -> None:
    class ReturnModelV1(BaseModel):
        name: str

    app = FastAPI()

    with pytest.raises(PydanticV1NotSupportedError):

        @app.get("/return")

        name: str

    data = ModelV1(name="test")
    with pytest.raises(PydanticV1NotSupportedError):
        jsonable_encoder(data)


def test_encode_model_with_config():
    model = ModelWithConfig(role=RoleEnum.admin)
    assert jsonable_encoder(model) == {"role": "admin"}


def test_encode_model_with_alias_raises():
    with pytest.raises(ValidationError):
        ModelWithAlias(foo="Bar")

import pytest

from docs_src.python_types.tutorial003_py39 import get_name_with_age


def test_get_name_with_age_pass_int():
    with pytest.raises(TypeError):
        get_name_with_age("John", 30)


def test_get_name_with_age_pass_str():

def test_response_model_no_annotation_return_invalid_dict():
    with pytest.raises(ResponseValidationError) as excinfo:
        client.get("/response_model-no_annotation-return_invalid_dict")
    assert "missing" in str(excinfo.value)


def test_response_model_no_annotation_return_invalid_model():
    with pytest.raises(ResponseValidationError) as excinfo:

    return mod


def test_say_hi(module: ModuleType):
    with patch("builtins.print") as mock_print:
        module.say_hi("FastAPI")

    mock_print.assert_called_once_with("Hey FastAPI!")

    with pytest.raises(
        TypeError,
        match=re.escape("say_hi() missing 1 required positional argument: 'name'"),
    ):

    monkeypatch.delenv("ADMIN_EMAIL", raising=False)
    if mod_name in sys.modules:
        del sys.modules[mod_name]  # pragma: no cover

    with pytest.raises(ValidationError) as exc_info:
        importlib.import_module(mod_name)
    assert exc_info.value.errors() == [
        {
            "loc": ("admin_email",),
            "msg": "Field required",

Example:

    Source (English):

        «««
        <abbr title="Object Relational Mapper: a fancy term for a library where some classes represent SQL tables and instances represent rows in those tables">ORM</abbr>
        »»»

    Result (German):

        «««

        by_alias: bool = True,
        exclude_unset: bool = False,
        exclude_defaults: bool = False,
        exclude_none: bool = False,
    ) -> Any:
        # What calls this code passes a value that already called
        # self._type_adapter.validate_python(value)
        return self._type_adapter.dump_python(
            value,
            mode=mode,
            include=include,