Ability to simulate HTTP response latency

[lachlan-eagling]

Hi @jamielennox,

Is there currently anyway to simulate latency on a mocked http response with requests-mock? I am trying to implement some unit tests for request timeouts but having some difficulty in mocking/simulating request latency.

Would be happy to work on this and open a PR if it was something you were open to having added, I was thinking it would be cool to have an additional kwarg for register_uri.

Example:

with self.assertRaises(requests.exceptions.Timeout), requests_mock.Mocker() as m:
    # Simulate a 500ms delay on HTTP response.
    m.register_uri("GET", "https://httpbin.org/get", text="foo", latency=500)
    requests.get("https://httpbin.org/get")
    ...

[jamielennox]

Kind of, though in the unit test you've used as an example it's not going to show much.

basically just do:

   m.get('https://httpbin.org/get', exc=requests.Timeout) 

and then your code should ensure that it's doing the right thing on exception handling rather than try and actually time things out.

[jamielennox]

Was just looking through old tickets and I still think this is a bad idea to do in unit testing, so probably not something i want to add to the library. However if you (or future people reading this bug) are absolutely convinced you want to do this it's pretty easy to do manually.

import time

import requests
import requests_mock

def delayed_response(timeout, **kwargs):
    time.sleep(timeout)
    return kwargs

with requests_mock.mock() as m:
    m.get("https://httpbin.org/get", **delayed_response(5, text="foo"))
    requests.get("https://httpbin.org/get")