Performance metrics (response time, throughput) in Testing Fundamentals - Test Execution Trace

Test Overview

This test measures the performance of a web API by checking its response time and throughput. It verifies that the API responds within an acceptable time and can handle a set number of requests per second.

Test Code - unittest

Testing Fundamentals

import time
import requests
import unittest

class TestAPIPerformance(unittest.TestCase):
    def test_response_time_and_throughput(self):
        url = "https://api.example.com/data"
        request_count = 10
        max_response_time = 0.5  # seconds
        start_time = time.time()

        for _ in range(request_count):
            response = requests.get(url)
            self.assertEqual(response.status_code, 200)
            self.assertLessEqual(response.elapsed.total_seconds(), max_response_time)

        total_time = time.time() - start_time
        throughput = request_count / total_time
        self.assertGreaterEqual(throughput, 5)  # at least 5 requests per second

if __name__ == '__main__':
    unittest.main()

Execution Trace - 7 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Test framework initialized, ready to run test method	-	PASS
2	Sends first GET request to https://api.example.com/data	API server receives request and processes it	Response status code is 200	PASS
3	Checks response time of first request is <= 0.5 seconds	Response received with timing info	Response elapsed time <= 0.5 seconds	PASS
4	Repeats sending GET requests until 10 requests are completed	API server handles multiple requests sequentially	Each response status code is 200 and response time <= 0.5 seconds	PASS
5	Calculates total time taken for 10 requests	Test records start and end time	-	PASS
6	Calculates throughput as requests per second	Throughput calculated from total requests and total time	Throughput >= 5 requests per second	PASS
7	Test ends with all assertions passed	Test framework reports success	-	PASS

Failure Scenario

Failing Condition: API response time exceeds 0.5 seconds or status code is not 200 or throughput is less than 5 requests per second

Execution Trace Quiz - 3 Questions

What does the test verify about the API response time?

A Response time is less than or equal to 0.5 seconds

B Response time is exactly 1 second

C Response time is more than 1 second

D Response time is not measured

Key Result

Measuring both response time and throughput together helps ensure an API is not only fast for single requests but can also handle multiple requests efficiently.