betamax

import betamax
from betamax.fixtures import unittest
import requests


def function():
    response = requests.get('https://httpbin.org/get')
    return response.json().get('url')


class IntegrationTestCase(unittest.BetamaxTestCase):
    CASSETTE_LIBRARY_DIR = "./bernardo"


class SpecificTestCase(IntegrationTestCase):
    def test_something(self):
        self.assertEqual(function(), 'https://httpbin.org/get')