urllib3-mock

A utility library for mocking out the urllib3 Python library.

This is an adaptation of the responses library.

Response body as string

from urllib3_mock import Responses
import requests

responses = Responses('requests.packages.urllib3')

@responses.activate
def test_my_api():
    responses.add('GET', '/api/1/foobar',
                  body='{"error": "not found"}', status=404,
                  content_type='application/json')

    resp = requests.get('http://twitter.com/api/1/foobar')

    assert resp.json() == {"error": "not found"}

    assert len(responses.calls) == 1
    assert responses.calls[0].request.url == '/api/1/foobar'
    assert responses.calls[0].request.host == 'twitter.com'
    assert responses.calls[0].request.scheme == 'http'

Request callback

import json

from urllib3_mock import Responses
import requests

responses = Responses('requests.packages.urllib3')

@responses.activate
def test_calc_api():

    def request_callback(request):
        payload = json.loads(request.body)
        resp_body = {'value': sum(payload['numbers'])}
        headers = {'request-id': '728d329e-0e86-11e4-a748-0c84dc037c13'}
        return (200, headers, json.dumps(resp_body))

    responses.add_callback('POST', '/sum',
                           callback=request_callback,
                           content_type='application/json')

    resp = requests.post(
        'http://calc.com/sum',
        json.dumps({'numbers': [1, 2, 3]}),
        headers={'content-type': 'application/json'},
    )

    assert resp.json() == {'value': 6}

    assert len(responses.calls) == 1
    assert responses.calls[0].request.url == '/sum'
    assert responses.calls[0].request.host == 'calc.com'
    assert (
        responses.calls[0].response.headers['request-id'] ==
        '728d329e-0e86-11e4-a748-0c84dc037c13'
    )

Instead of passing a string URL into responses.add or responses.add_callback you can also supply a compiled regular expression.

import re
from urllib3_mock import Responses
import requests

responses = Responses('requests.packages.urllib3')

# Instead of
responses.add('GET', '/api/1/foobar',
              body='{"error": "not found"}', status=404,
              content_type='application/json')

# You can do the following
url_re = re.compile(r'/api/\d+/foobar')
responses.add('GET', url_re,
              body='{"error": "not found"}', status=404,
              content_type='application/json')

A response can also throw an exception as follows.

from urllib3_mock import Responses
from requests.packages.urllib3.exceptions import HTTPError

exception = HTTPError('Something went wrong')

responses = Responses('requests.packages.urllib3')
responses.add('GET', '/api/1/foobar',
              body=exception)
# All calls to 'http://twitter.com/api/1/foobar' will throw exception.