import pytest
from fastapi import FastAPI
from fastapi.exceptions import FastAPIError


class NonPydanticModel:
    pass


def test_invalid_response_model_raises():
    with pytest.raises(FastAPIError):
        app = FastAPI()

        @app.get("/", response_model=NonPydanticModel)
        def read_root():
            pass  # pragma: nocover


def test_invalid_response_model_sub_type_raises():

import pytest
from fastapi import APIRouter, FastAPI
from fastapi.exceptions import FastAPIError
from fastapi.testclient import TestClient

app = FastAPI()

router = APIRouter()


@router.get("")
def get_empty():
    return ["OK"]


app.include_router(router, prefix="/prefix")


client = TestClient(app)


def test_use_empty():
    with client:
        response = client.get("/prefix")

RequestErrorModel: type[BaseModel] = create_model("Request")
WebSocketErrorModel: type[BaseModel] = create_model("WebSocket")


class FastAPIError(RuntimeError):
    """
    A generic, FastAPI-specific error.
    """


class DependencyScopeError(FastAPIError):
    """
    A dependency declared that it depends on another dependency with an invalid
    (narrower) scope.
    """

from contextvars import ContextVar
from typing import Annotated, Any

import pytest
from fastapi import Depends, FastAPI, WebSocket
from fastapi.exceptions import FastAPIError
from fastapi.testclient import TestClient

global_context: ContextVar[dict[str, Any]] = ContextVar("global_context", default={})  # noqa: B039


class Session:
    def __init__(self) -> None:
        self.open = True


async def dep_session() -> Any:

import json
from typing import Annotated, Any

import pytest
from fastapi import APIRouter, Depends, FastAPI, HTTPException
from fastapi.exceptions import FastAPIError
from fastapi.responses import StreamingResponse
from fastapi.testclient import TestClient


class Session:
    def __init__(self) -> None:
        self.open = True


def dep_session() -> Any:
    s = Session()
    yield s
    s.open = False

import pytest
from fastapi import FastAPI
from fastapi.exceptions import FastAPIError, ResponseValidationError
from fastapi.responses import JSONResponse, Response
from fastapi.testclient import TestClient
from inline_snapshot import snapshot
from pydantic import BaseModel


class BaseUser(BaseModel):
    name: str


class User(BaseUser):
    surname: str


class DBUser(User):
    password_hash: str

    get_stream_item_type,
    get_typed_return_annotation,
    solve_dependencies,
)
from fastapi.encoders import jsonable_encoder
from fastapi.exceptions import (
    EndpointContext,
    FastAPIError,
    RequestValidationError,
    ResponseValidationError,
    WebSocketRequestValidationError,
)
from fastapi.sse import (
    _PING_INTERVAL,
    KEEPALIVE_COMMENT,
    EventSourceResponse,

    try:
        return v2.ModelField(mode=mode, name=name, field_info=field_info)
    except PydanticSchemaGenerationError:
        raise fastapi.exceptions.FastAPIError(
            _invalid_args_message.format(type_=type_)
        ) from None


def generate_operation_id_for_path(
    *, name: str, path: str, method: str
) -> str:  # pragma: nocover
    warnings.warn(

from fastapi.exception_handlers import (
    http_exception_handler,
    request_validation_exception_handler,
    websocket_request_validation_exception_handler,
)
from fastapi.exceptions import (
    FastAPIError,
    RequestValidationError,
    WebSocketRequestValidationError,
)
from fastapi.logger import logger
from fastapi.middleware.asyncexitstack import AsyncExitStackMiddleware
from fastapi.openapi.docs import (

## 0.123.2 (2025-12-02)

### Fixes

* 🐛 Fix unformatted `{type_}` in FastAPIError. PR [#14416](https://github.com/fastapi/fastapi/pull/14416) by [@Just-Helpful](https://github.com/Just-Helpful).