mock out Python aiohttp ClientSession requests

 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.