Fix failing tests about plivo-python HOT 2 CLOSED

def test_delete_phone_number(self):
    requests_list = []  # track all the requests made to plivo

    @urlmatch(netloc='api\.plivo\.com')
    def response_content(url, request):
        requests_list.append((request.method, url.geturl()))
        return { 'status_code': 204, 'content': '' }

    with HTTMock(response_content):
        resp = self.delete('/api/v1/phone_number/{}/'.format(pn.pk), api_key=test_api_key)
        response_success(resp)

    # Assert that we only made a single DELETE request to Plivo
    self.assertEqual(requests_list, [
        ('DELETE', 'https://api.plivo.com/v1/Account/TEST_PLIVO_AUTH_ID/Number/16503334444/')
    ])