assertEquals(testMessage, exception.getMessage(), "The exception message should match the input message.");
    }

    /**
     * Test the NO_NULL_REF static field.
     * Ensures that the static field holds the expected string value.
     */
    @Test
    void testNoNullRefConstant() {
        assertNotNull(NdrException.NO_NULL_REF, "NO_NULL_REF constant should not be null.");

Вы можете проверить это в интерфейсе документации по адресу `/docs`:

<div class="screenshot">
<img src="/img/tutorial/request-form-models/image01.png">
</div>

## Запрет дополнительных полей формы { #forbid-extra-form-fields }

В некоторых случаях (не особо часто встречающихся) вам может понадобиться **ограничить** поля формы только теми, которые объявлены в Pydantic-модели. И **запретить** любые **дополнительные** поля.

/// note | Заметка

     */
    public SearchForm() {
    }

    /**
     * The name field for searching file configurations.
     */
    public String name;

    /**
     * The paths field for searching file configurations.
     */
    public String paths;

    /**
     * The description field for searching file configurations.
     */
    public String description;

     */
    public SearchForm() {
    }

    /**
     * The name field for searching web configurations.
     */
    public String name;

    /**
     * The URLs field for searching web configurations.
     */
    public String urls;

    /**
     * The description field for searching web configurations.
     */
    public String description;

      """
      |--AaB03x
      |Content-Disposition: form-data; name="field with spaces"; filename="filename with spaces.txt"
      |Content-Type: text/plain; charset=utf-8
      |
      |okay
      |--AaB03x
      |Content-Disposition: form-data; name="field with %22"
      |
      |"
      |--AaB03x
      |Content-Disposition: form-data; name="field with %22"
      |
      |%22
      |--AaB03x

	var field []byte
	_ = field
	var zb0001 uint32
	zb0001, bts, err = msgp.ReadMapHeaderBytes(bts)
	if err != nil {
		err = msgp.WrapError(err)
		return
	}
	for zb0001 > 0 {
		zb0001--
		field, bts, err = msgp.ReadMapKeyZC(bts)
		if err != nil {
			err = msgp.WrapError(err)
			return
		}
		switch msgp.UnsafeString(field) {
		case "Name":

/// tip

如果你需要在 async 函式內呼叫阻塞程式碼，或在阻塞函式中呼叫 async 函式，你可以使用 [Asyncer](https://asyncer.tiangolo.com)，它是 FastAPI 的姊妹函式庫。

///

### `yield from` { #yield-from }

當你在迭代某個物件（如類檔案物件），並對每個項目使用 `yield` 時，也可以用 `yield from` 直接逐項產出，省略 `for` 迴圈。

這不是 FastAPI 特有的功能，而是 Python 語法；不過這招很實用。 😎

@dataclass
class Dependant:
    path_params: list[ModelField] = field(default_factory=list)
    query_params: list[ModelField] = field(default_factory=list)
    header_params: list[ModelField] = field(default_factory=list)
    cookie_params: list[ModelField] = field(default_factory=list)
    body_params: list[ModelField] = field(default_factory=list)
    dependencies: list["Dependant"] = field(default_factory=list)
    name: str | None = None

client = TestClient(app)


def test_dependency_contextvars():
    """
    Check that custom middlewares don't affect the contextvar context for dependencies.

    The code before yield and the code after yield should be run in the same contextvar
    context, so that request_state_context_var.reset(contextvar_token).

    If they are run in a different context, that raises an error.
    """

def test_with_computed_field():
    client = get_app_client()
    client_no = get_app_client(separate_input_output_schemas=False)
    response = client.post("/with-computed-field/", json={"name": "example"})
    response2 = client_no.post("/with-computed-field/", json={"name": "example"})
    assert response.status_code == response2.status_code == 200, response.text
    assert (
        response.json()
        == response2.json()