Aioresponses is a helper for mock/fake web requests in python aiohttp package.
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README.rst

aioresponses

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Aioresponses is a helper to mock/fake web requests in python aiohttp package.

For requests module there are a lot of packages that help us with testing (eg. httpretty, responses, requests-mock).

When it comes to testing asynchronous HTTP requests it is a bit harder (at least at the beginning). The purpose of this package is to provide an easy way to test asynchronous HTTP requests.

Installing

$ pip install aioresponses

Supported versions

  • Python 3.5.3+
  • aiohttp>=2.0.0,<4.0.0

Usage

To mock out HTTP request use aioresponses as a method decorator or as a context manager.

Response status code, body, payload (for json response) and headers can be mocked.

Supported HTTP methods: GET, POST, PUT, PATCH, DELETE and OPTIONS.

import aiohttp
import asyncio
from aioresponses import aioresponses

@aioresponses()
def test_request(mocked):
    loop = asyncio.get_event_loop()
    mocked.get('http://example.com', status=200, body='test')
    session = aiohttp.ClientSession()
    resp = loop.run_until_complete(session.get('http://example.com'))

    assert resp.status == 200

for convenience use payload argument to mock out json response. Example below.

as a context manager

import asyncio
import aiohttp
from aioresponses import aioresponses

def test_ctx():
    loop = asyncio.get_event_loop()
    session = aiohttp.ClientSession()
    with aioresponses() as m:
        m.get('http://test.example.com', payload=dict(foo='bar'))

        resp = loop.run_until_complete(session.get('http://test.example.com'))
        data = loop.run_until_complete(resp.json())

        assert dict(foo='bar') == data

aioresponses allows to mock out any HTTP headers

import asyncio
import aiohttp
from aioresponses import aioresponses

@aioresponses()
def test_http_headers(m):
    loop = asyncio.get_event_loop()
    session = aiohttp.ClientSession()
    m.post(
        'http://example.com',
        payload=dict(),
        headers=dict(connection='keep-alive'),
    )

    resp = loop.run_until_complete(session.post('http://example.com'))

    # note that we pass 'connection' but get 'Connection' (capitalized)
    # under the neath `multidict` is used to work with HTTP headers
    assert resp.headers['Connection'] == 'keep-alive'

allows to register different responses for the same url

import asyncio
import aiohttp
from aioresponses import aioresponses

@aioresponses()
def test_multiple_responses(m):
    loop = asyncio.get_event_loop()
    session = aiohttp.ClientSession()
    m.get('http://example.com', status=500)
    m.get('http://example.com', status=200)

    resp1 = loop.run_until_complete(session.get('http://example.com'))
    resp2 = loop.run_until_complete(session.get('http://example.com'))

    assert resp1.status == 500
    assert resp2.status == 200

allows to passthrough to a specified list of servers

import asyncio
import aiohttp
from aioresponses import aioresponses

@aioresponses(passthrough=['http://backend'])
def test_passthrough(m, test_client):
    session = aiohttp.ClientSession()
    # this will actually perform a request
    resp = loop.run_until_complete(session.get('http://backend/api'))

aioresponses allows to throw an exception

import asyncio
from aiohttp import ClientSession, HttpProcessingError
from aioresponses import aioresponses

@aioresponses()
def test_how_to_throw_an_exception(m, test_client):
    loop = asyncio.get_event_loop()
    session = ClientSession()
    m.get('http://example.com/api', exception=HttpProcessingError('test'))

    # calling
    # loop.run_until_complete(session.get('http://example.com/api'))
    # will throw an exception.

aioresponses can be used in a pytest fixture

import pytest
from aioresponses import aioresponses

@pytest.fixture
def mock_aioresponse():
    with aioresponses() as m:
        yield m

Features

  • Easy to mock out HTTP requests made by aiohttp.ClientSession

Disclaimer

Due to the fact that get, post, put, delete methods from aiohttp are in deprecation mode and they are NOT supported by this package.

License

  • Free software: MIT license

Credits

This package was created with Cookiecutter and the audreyr/cookiecutter-pypackage project template.