Async test patterns in FastAPI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the correct test client for async FastAPI testing.

FastAPI

from fastapi.testclient import [1]

Drag options to blanks, or click blank then click option'

AClient

BAsyncClient

CTestClient

DAsyncTestClient

Attempts:

3 left

💡 Hint

Common Mistakes

Using AsyncClient which is not from fastapi.testclient

Trying to import a client that does not exist

The TestClient is the standard synchronous test client FastAPI provides. For async tests, you use other tools.

2fill in blank

medium

Complete the code to import the async HTTP client from httpx for async FastAPI testing.

FastAPI

from httpx import [1]

Drag options to blanks, or click blank then click option'

AAsyncClient

BClient

CTestClient

DHTTPClient

Attempts:

3 left

💡 Hint

Common Mistakes

Using synchronous TestClient from fastapi.testclient for async tests

Using a client name that does not exist in httpx

AsyncClient from httpx is used for async HTTP requests in tests.

3fill in blank

hard

Fix the error in the async test function by completing the missing keyword to await the client call.

FastAPI

async def test_read_main(async_client):
    response = [1] async_client.get("/")
    assert response.status_code == 200

Drag options to blanks, or click blank then click option'

Aawait

Basync

Cyield

Dreturn

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to use await causing coroutine object errors

Using async keyword incorrectly inside the function

Async calls must be awaited to get their result. Here, await is needed before async_client.get.

4fill in blank

hard

Fill both blanks to create an async test fixture that yields an AsyncClient for FastAPI testing.

FastAPI

import pytest
from httpx import AsyncClient

@pytest.fixture
async def async_client():
    async with AsyncClient(app=[1], base_url=[2]) as client:
        yield client

Drag options to blanks, or click blank then click option'

Aapp

B"http://testserver"

C"https://example.com"

Dclient

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong base URL causing connection errors

Passing wrong variable instead of app instance

The fixture uses the FastAPI app instance and the base URL "http://testserver" for testing.

5fill in blank

hard

Fill all three blanks to write an async test that uses the async_client fixture to get the root path and check the JSON response.

FastAPI

async def test_root(async_client):
    response = await async_client.[1]("/")
    assert response.status_code == 200
    data = response.[2]()
    assert data == [3]

Drag options to blanks, or click blank then click option'

Apost

Bjson

C{"message": "Hello World"}

Dget

Attempts:

3 left

💡 Hint

Common Mistakes

Using POST instead of GET for a simple fetch

Not calling json() method to parse response

Comparing response to wrong expected data

The test sends a GET request, parses JSON response, and checks it matches the expected dictionary.