},
            },
        }
    },
}


def test_openapi_schema():
    client = TestClient(app)
    response = client.get("/openapi.json")
    assert response.status_code == 200
    assert response.json() == openapi_schema


@pytest.mark.parametrize(
    "path,cookies,expected_status,expected_response",
    [
        (

Diese gibt lediglich eine JSON-Response zurück, mit dem Ergebnis der Methode `.openapi()` der Anwendung.

Standardmäßig überprüft die Methode `.openapi()` die Eigenschaft `.openapi_schema`, um zu sehen, ob diese Inhalt hat, und gibt diesen zurück.

Ist das nicht der Fall, wird der Inhalt mithilfe der Hilfsfunktion unter `fastapi.openapi.utils.get_openapi` generiert.

def test_redirect_status_code():
    response = client.get("/pydantic", follow_redirects=False)
    assert response.status_code == 302
    assert response.headers["location"] == "https://docs.pydantic.dev/"


def test_openapi_schema():
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},

`FastAPI` 应用（实例）提供了返回 OpenAPI 概图的 `.openapi()` 方法。

作为应用对象创建的组成部分，要注册 `/openapi.json` （或其它为 `openapi_url` 设置的任意内容）*路径操作*。

它只返回包含应用的 `.openapi()` 方法操作结果的 JSON 响应。

但默认情况下，`.openapi()` 只是检查 `.openapi_schema` 属性是否包含内容，并返回其中的内容。

如果 `.openapi_schema` 属性没有内容，该方法就使用 `fastapi.openapi.utils.get_openapi` 工具函数生成内容。

`get_openapi()` 函数接收如下参数：

* `title`：文档中显示的 OpenAPI 标题
* `version`：API 的版本号，例如 `2.5.0`

    assert response.json() == {"cls": "A"}

    response = client.get("/b")
    assert response.status_code == 200, response.text
    assert response.json() == {"cls": "B"}


def test_openapi_schema():
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "openapi": "3.1.0",

                "loc": ["tags", 3],
                "msg": "Input should be a valid string",
                "input": {"sneaky": "object"},
            }
        ]
    }


@needs_pydanticv2
def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",

                    "msg": "value is not a valid integer",
                    "type": "type_error.integer",
                }
            ]
        }
    )


@needs_py39
def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",

                    "loc": ["query", "needy"],
                    "msg": "field required",
                    "type": "value_error.missing",
                }
            ]
        }
    )


def test_openapi_schema():
    response = client.get("/openapi.json")
    assert response.status_code == 200
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},

                    "msg": "value is not a valid integer",
                    "type": "type_error.integer",
                }
            ]
        }
    )


def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",

def test_get():
    response = client.get("/items/2")
    assert response.status_code == 200, response.text
    assert response.json() == {"item_id": 2}


def test_openapi_schema():
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},