Performance metrics (response time, throughput) in Testing Fundamentals - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Response Time

Which of the following best describes response time in performance testing?

A The total time taken to complete all requests in a test.

B The time taken for a system to respond to a single request.

C The number of requests processed per second.

D The amount of data transferred during the test.

💡 Hint

Think about how long a user waits after making a request.

Response time measures how long it takes for the system to reply to one request, not the total or throughput.

❓ Predict Output

intermediate

Calculating Throughput

Given the following test results, what is the throughput (requests per second)?

total_requests = 500
total_time_seconds = 50
throughput = total_requests / total_time_seconds
print(throughput)

Testing Fundamentals

total_requests = 500
total_time_seconds = 50
throughput = total_requests / total_time_seconds
print(throughput)

A 500.0

B 0.1

C 10.0

D 50.0

💡 Hint

Divide total requests by total time in seconds.

Throughput is requests divided by time, so 500 / 50 = 10 requests per second.

❓ assertion

advanced

Validating Response Time Threshold

Which assertion correctly checks that the response time is less than 2 seconds in a test script?

Testing Fundamentals

response_time = 1.8  # seconds

A assert response_time < 2

B assert response_time > 2

C assert response_time == 2

D assert response_time >= 2

💡 Hint

We want to confirm response time is under the limit.

To ensure response time is less than 2 seconds, use < 2 in the assertion.

🔧 Debug

advanced

Identifying Throughput Calculation Error

Find the error in this throughput calculation code snippet:

total_requests = 1000
total_time_seconds = 0
throughput = total_requests / total_time_seconds
print(throughput)

A Throughput will be zero because total_requests is too high.

B No error; throughput will print 1000.

C Syntax error due to missing colon.

D Division by zero error because total_time_seconds is zero.

💡 Hint

Check if dividing by zero is possible.

Dividing by zero causes a runtime error; total_time_seconds cannot be zero.

❓ framework

expert

Choosing the Best Metric for Load Testing

In a load test simulating 1000 users, which metric best indicates how many requests the system handles per second?

A Throughput

B Response time

C Error rate

D CPU usage

💡 Hint

Think about the number of requests processed over time.

Throughput measures requests per second, showing system capacity under load.