How can I test asynchronous code in Flask?

How can I test asynchronous code in Flask?

To test asynchronous code in Flask, you can use the pytest framework along with pytest-asyncio.

Can you show me a simple example of an async test?

Sure! Here's a basic example:

import pytest
from your_flask_app import create_app

@pytest.mark.asyncio
def test_async_route():
    app = create_app()
    client = app.test_client()
    response = await client.get('/async-route')
    assert response.status_code == 200

What if I need to mock an async function?

You can use unittest.mock to mock async functions. Here's an example:

from unittest.mock import patch

@patch('your_module.async_function')
async def test_mocked_async_function(mock_async):
    mock_async.return_value = 'mocked result'
    result = await your_async_function()
    assert result == 'mocked result'

Are there any specific libraries for async testing?

Yes, besides pytest-asyncio, you can also look into httpx for making async HTTP requests in your tests.