test_aiohttp_session.py

import asyncio
from aiohttp import web
from aiohttp_session import get_session, session_middleware, SimpleCookieStorage


async def show(request):
    session = await get_session(request)
    message = session.pop('message', None)
    return web.Response(text='message: {}'.format(message))


async def set_raise(request):
    session = await get_session(request)
    session['message'] = 'raise works'
    raise web.HTTPFound('/')


async def set_return(request):
    session = await get_session(request)
    session['message'] = 'return works'
    return web.HTTPFound('/')


app = web.Application(middlewares=[session_middleware(SimpleCookieStorage())])
app.router.add_route('GET', '/', show)
app.router.add_route('GET', '/raise', set_raise)
app.router.add_route('GET', '/return', set_return)


loop = asyncio.get_event_loop()
f = loop.create_server(app.make_handler(), '127.0.0.1', 8000)
srv = loop.run_until_complete(f)
loop.run_forever()