Performance testing basics in Testing Fundamentals - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Load Testing Purpose

What is the main goal of load testing in performance testing?

A To verify the correctness of business logic in the application

B To find the maximum number of users the system can handle before crashing

C To test the system's security against unauthorized access

D To check how the system behaves under expected normal user load

💡 Hint

Think about testing the system under typical usage conditions.

Load testing measures system behavior under expected normal user load to ensure it performs well during regular use.

❓ Predict Output

intermediate

Interpreting Response Time Measurement Code

What will be the output of this Python code snippet simulating a simple response time measurement?

Testing Fundamentals

import time
start = time.time()
time.sleep(0.5)
end = time.time()
response_time = end - start
print(round(response_time, 1))

A 5.0

B 0.05

C 0.5

D 0.005

💡 Hint

Consider how long time.sleep(0.5) pauses the program.

The code pauses for 0.5 seconds, so the response time measured will be approximately 0.5 seconds.

❓ assertion

advanced

Validating Throughput Assertion in Performance Test

Which assertion correctly checks that the throughput is at least 100 requests per second?

Testing Fundamentals

throughput = get_throughput()
# Insert assertion here

A assert throughput >= 100, f"Throughput too low: {throughput}"

B assert throughput > 100, f"Throughput too low: {throughput}"

C assert throughput < 100, f"Throughput too high: {throughput}"

D assert throughput == 100, f"Throughput mismatch: {throughput}"

💡 Hint

Think about including the minimum acceptable throughput value.

The assertion must allow throughput equal to or greater than 100, so using >= is correct.

🔧 Debug

advanced

Identifying Bottleneck in Performance Test Report

A performance test report shows high CPU usage but low memory usage and slow response times. What is the most likely bottleneck?

A Disk I/O is the bottleneck causing slow responses

B CPU is the bottleneck causing slow responses

C Network bandwidth is saturated causing slow responses

D Memory is insufficient causing slow responses

💡 Hint

High CPU usage often means the processor is overloaded.

High CPU usage with slow responses indicates the CPU is the bottleneck limiting performance.

❓ framework

expert

Choosing the Best Tool for Stress Testing

You need to perform stress testing on a web application to find its breaking point under extreme load. Which tool is best suited for this task?

A Apache JMeter, because it supports creating heavy load scenarios and detailed reports

B Postman, because it is designed for API functional testing with simple load

C Selenium WebDriver, because it automates browser actions for functional testing

D JUnit, because it is used for unit testing Java code

💡 Hint

Look for a tool that can simulate many users and measure performance under load.

Apache JMeter is designed for performance and stress testing with the ability to simulate heavy loads and generate reports.