Unit Test Retry functionality provided by Python

Question

I am using the code below to perform exponential retries. I have set the reties to 5. As part of my unit test, I am mocking the response and returning status code 503. However I do not see 5 retries being performed when I use this unit test. What changes should I make to my unit test to validate that session.get has retried 5 times?

try:
    max_retries = Retry(total=retries, backoff_factor=5, status_forcelist=[500, 502, 503, 504, 429])
    self.session.mount('https://', HTTPAdapter(max_retries=max_retries))
    # Perform GET request
    response = self.session.get(url, verify=verify)
except Exception as e:
    print(f" Exception occured {e}")
return response

Unit Test

def test_my_function_retries(self):    
    responses.add(responses.GET,
                  'https://requesturl',
                  json={}, status=503)
    request.get()

Answer 1

I was able to use httpretty to test the retries

@httpretty.activate
def test_my_function(self):
    httpretty.register_uri(
        httpretty.GET,
        url,           
        responses=[
            httpretty.Response(
                body='{}',
                status=503,
            ),
        ]
    )

    my_class = MyClass()
    my_class.my_function()
    print(len(httpretty.latest_requests()))