from fastapi import Depends, FastAPI, Security
from fastapi.security.open_id_connect_url import OpenIdConnect
from fastapi.testclient import TestClient
from inline_snapshot import snapshot
from pydantic import BaseModel

app = FastAPI()

oid = OpenIdConnect(
    openIdConnectUrl="/openid", description="OpenIdConnect security scheme"
)


class User(BaseModel):
    username: str

from fastapi import FastAPI, Path, Query, status
from fastapi.testclient import TestClient
from inline_snapshot import snapshot

app = FastAPI()


@app.get("/{repeated_alias}")
def get_parameters_with_repeated_aliases(
    path: str = Path(..., alias="repeated_alias"),
    query: str = Query(..., alias="repeated_alias"),
):
    return {"path": path, "query": query}


client = TestClient(app)


def test_get_parameters():

See https://github.com/tiangolo/fastapi/discussions/9116
"""

from pathlib import Path
from typing import Annotated

import pytest
from fastapi import FastAPI, File, Form
from fastapi.testclient import TestClient

app = FastAPI()


@app.post("/file_before_form")
def file_before_form(
    file: bytes = File(),
    city: str = Form(),
):
    return {"file_content": file, "city": city}

from fastapi import Depends, FastAPI, Security
from fastapi.security.open_id_connect_url import OpenIdConnect
from fastapi.testclient import TestClient
from inline_snapshot import snapshot
from pydantic import BaseModel

app = FastAPI()

oid = OpenIdConnect(openIdConnectUrl="/openid", auto_error=False)


class User(BaseModel):
    username: str


def get_current_user(oauth_header: str | None = Security(oid)):

from typing import Annotated

from fastapi import FastAPI, Form
from fastapi.testclient import TestClient
from inline_snapshot import snapshot

app = FastAPI()


@app.post("/form/")
def post_form(username: Annotated[str, Form()]):
    return username


client = TestClient(app)


def test_single_form_field():
    response = client.post("/form/", data={"username": "Rick"})
    assert response.status_code == 200, response.text

from fastapi import FastAPI
from fastapi.testclient import TestClient
from inline_snapshot import snapshot
from pydantic import BaseModel

app = FastAPI()


class Items(BaseModel):
    items: dict[str, int]


@app.post("/foo")
def foo(items: Items):
    return items.items


client = TestClient(app)


def test_additional_properties_post():
    response = client.post("/foo", json={"items": {"foo": 1, "bar": 2}})

import pytest
from fastapi import Body, Depends, FastAPI, HTTPException
from fastapi.testclient import TestClient

initial_fake_database = {"rick": "Rick Sanchez"}

fake_database = initial_fake_database.copy()

initial_state = {"except": False, "finally": False}

state = initial_state.copy()

app = FastAPI()


async def get_database():
    temp_database = fake_database.copy()
    try:
        yield temp_database

from typing import Annotated

import pytest
from fastapi import FastAPI, Path
from fastapi.testclient import TestClient
from inline_snapshot import Is, snapshot

app = FastAPI()


@app.get("/required-str/{p}")
async def read_required_str(p: Annotated[str, Path()]):
    return {"p": p}


@app.get("/required-alias/{p_alias}")
async def read_required_alias(p: Annotated[str, Path(alias="p_alias")]):
    return {"p": p}

import pytest
from fastapi import APIRouter, FastAPI
from fastapi.routing import APIRoute
from fastapi.testclient import TestClient
from inline_snapshot import snapshot
from starlette.routing import Route

app = FastAPI()


class APIRouteA(APIRoute):
    x_type = "A"


class APIRouteB(APIRoute):
    x_type = "B"


class APIRouteC(APIRoute):
    x_type = "C"


router_a = APIRouter(route_class=APIRouteA)

**FastAPI** アプリケーションが通常の `def` 関数を使っていても、その内側は依然として `async` アプリケーションです。

`TestClient` は、標準の pytest を使って通常の `def` のテスト関数から非同期の FastAPI アプリを呼び出すための「おまじない」を内部で行います。しかし、その「おまじない」はテスト関数自体が非同期の場合には機能しません。テストを非同期で実行すると、テスト関数内で `TestClient` は使えなくなります。

`TestClient` は [HTTPX](https://www.python-httpx.org) を基に作られており、幸いなことに API のテストには HTTPX を直接利用できます。

## 例 { #example }