// Wait for the first task to be started in the background. It will block until we explicitly
    // stop it.
    blockingCallable.waitForStart();

    // Give the second task a chance to (incorrectly) start up while the first task is running.
    assertThat(future2.isDone()).isFalse();

    // Stop the first task. The second task should then run.
    blockingCallable.stop();

你已經看過如何使用提供的 `TestClient` 來測試你的 FastAPI 應用。到目前為止，你只看到如何撰寫同步測試，沒有使用 `async` 函式。

在測試中能使用非同步函式會很有用，例如當你以非同步方式查詢資料庫時。想像你想測試發送請求到 FastAPI 應用，然後在使用非同步資料庫函式庫時，驗證後端是否成功把正確資料寫入資料庫。

來看看怎麼做。

## pytest.mark.anyio { #pytest-mark-anyio }

若要在測試中呼叫非同步函式，測試函式本身也必須是非同步的。AnyIO 為此提供了一個好用的外掛，讓我們可以標示某些測試函式以非同步方式執行。

## HTTPX { #httpx }

即使你的 FastAPI 應用使用一般的 `def` 函式而非 `async def`，它在底層仍然是個 `async` 應用。

import pytest
from typer.testing import CliRunner

from scripts.translation_fixer import cli

data_path = Path(
    "scripts/tests/test_translation_fixer/test_header_permalinks/data"
).absolute()


@pytest.mark.parametrize(
    "copy_test_files",
    [(f"{data_path}/en_doc.md", f"{data_path}/translated_doc_number_gt.md")],
    indirect=True,
)
def test_gt(runner: CliRunner, root_dir: Path, copy_test_files):

            }
        ]
    )


@pytest.mark.parametrize(
    "path",
    ["/optional-str", "/model-optional-str"],
)
def test_optional_str_missing(path: str):
    client = TestClient(app)
    response = client.get(path)
    assert response.status_code == 200
    assert response.json() == {"p": None}


@pytest.mark.parametrize(
    "path",
    ["/optional-str", "/model-optional-str"],
)

            task.setDescription("Runs rest tests against an elasticsearch cluster.");
            task.setGroup(JavaBasePlugin.VERIFICATION_GROUP);
            task.mustRunAfter(project.getTasks().named("precommit"));
        });
        project.getTasks().named("check").configure(task -> task.dependsOn(integTest));
    }

class HeaderModelRequiredStr(BaseModel):
    p: str


@app.get("/model-required-str")
async def read_model_required_str(p: Annotated[HeaderModelRequiredStr, Header()]):
    return {"p": p.p}


@pytest.mark.parametrize(
    "path",
    ["/required-str", "/model-required-str"],
)
def test_required_str_schema(path: str):
    assert app.openapi()["paths"][path]["get"]["parameters"] == snapshot(
        [
            {

        }
        """

        when:
        def result = gradleRunner("yamlRestTest").build()

        then:
        result.task(':yamlRestTest').outcome == TaskOutcome.NO_SOURCE
        result.task(':copyYamlTestsTask').outcome == TaskOutcome.NO_SOURCE
        result.task(':copyRestApiSpecsTask').outcome == TaskOutcome.NO_SOURCE
    }

    def "yamlRestTest executes and copies api and tests to correct source set"() {

    assertThat(readFully(reader)).isEqualTo(string);
    assertFullyRead(reader);

    // reset, skip, mark, then read the rest
    reader.reset();
    assertEquals(5, reader.skip(5));
    reader.mark(Integer.MAX_VALUE);
    assertThat(readFully(reader)).isEqualTo(string.substring(5));
    assertFullyRead(reader);

    // reset to the mark and then read the rest
    reader.reset();

				}
			}

			if task.respCh != nil {
				task.respCh <- healResult{result: res, err: err}
				continue
			}

			// when respCh is not set caller is not waiting but we
			// update the relevant metrics for them
			if bgSeq != nil {
				if err == nil {
					bgSeq.countHealed(res.Type)
				} else {
					bgSeq.countFailed(res.Type)
				}

    }


@pytest.mark.parametrize(
    "path",
    [
        "/optional-list-bytes",
        "/optional-list-uploadfile",
    ],
)
def test_optional_list_missing(path: str):
    client = TestClient(app)
    response = client.post(path)
    assert response.status_code == 200, response.text
    assert response.json() == {"file_size": None}


@pytest.mark.parametrize(
    "path",
    [