Performance test types (load, stress, spike, soak) in Testing Fundamentals - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Identify the correct definition of a load test

Which of the following best describes a load test in performance testing?

A Testing the system over an extended period to check for memory leaks and performance degradation.

B Testing the system by gradually increasing the load until it breaks to find the maximum capacity.

C Testing the system by suddenly increasing the load to observe how it handles unexpected spikes.

D Testing the system under normal and peak expected user loads to measure response times and throughput.

💡 Hint

Think about testing under expected user conditions.

Load testing measures how the system performs under expected normal and peak loads, focusing on response times and throughput.

🧠 Conceptual

intermediate

Purpose of a stress test

What is the main goal of a stress test in performance testing?

A To find the system's breaking point by applying loads beyond normal capacity.

B To test system recovery after sudden load spikes.

C To verify system behavior under normal user load.

D To check system stability over a long duration.

💡 Hint

Think about pushing the system beyond limits.

Stress testing pushes the system beyond its normal limits to find the maximum capacity and observe failure behavior.

🧠 Conceptual

advanced

Difference between spike and soak tests

Which statement correctly distinguishes a spike test from a soak test?

A Spike test applies gradual load increase; soak test applies sudden load spikes.

B Spike test applies sudden high load for a short time; soak test applies normal load for a long time.

C Spike test checks system recovery after failure; soak test checks system under peak load.

D Spike test runs for days; soak test runs for seconds.

💡 Hint

Consider the duration and load pattern differences.

Spike testing involves sudden, sharp increases in load for a short period, while soak testing runs the system under normal load for a long time to check stability.

🧠 Conceptual

advanced

Identifying test types by scenario

A web app is tested by gradually increasing users until it crashes. Which performance test type is this?

A Stress test

B Load test

C Spike test

D Soak test

💡 Hint

Think about pushing the system to failure.

Gradually increasing load until failure is characteristic of stress testing to find the system's limits.

🧠 Conceptual

expert

Choosing the right test for memory leak detection

Which performance test type is best suited to detect memory leaks and resource depletion over time?

A Spike test

B Stress test

C Soak test

D Load test

💡 Hint

Consider long duration testing.

Soak testing runs the system under normal load for a long time to detect issues like memory leaks and performance degradation.

Practice

1. Which type of performance test checks how a system handles normal user traffic over a period?

easy

A. Load test

B. Stress test

C. Spike test

D. Soak test

Solution

1. Step 1: Understand the purpose of load testing

   Load testing measures system behavior under expected normal traffic to ensure it can handle typical user demand.

2. Step 2: Differentiate from other test types

   Stress tests push beyond normal limits, spike tests check sudden jumps, and soak tests check long-term stability, not normal traffic.

3. Final Answer:

   Load test -> Option A

4. Quick Check:

   Normal traffic = Load test [OK]

Hint: Normal user traffic means load test [OK]

Common Mistakes:

• Confusing stress test with load test
• Thinking spike test handles normal traffic
• Mixing soak test with short-term tests

2. Which of the following is the correct description of a spike test?

easy

A. Testing system reaction to sudden traffic increase

B. Testing system under gradually increasing load

C. Testing system limits by pushing beyond capacity

D. Testing system stability over a long period

Solution

1. Step 1: Define spike test

   Spike testing checks how a system reacts to sudden, sharp increases in traffic or load.

2. Step 2: Compare with other test types

   Gradual increase is load test, pushing beyond capacity is stress test, and long period stability is soak test.

3. Final Answer:

   Testing system reaction to sudden traffic increase -> Option A

4. Quick Check:

   Sudden jump = Spike test [OK]

Hint: Sudden traffic jump means spike test [OK]

Common Mistakes:

• Confusing spike test with load test
• Mixing stress test with spike test
• Thinking soak test is about sudden changes

3. Consider this scenario: A system is tested by gradually increasing users from 100 to 1000 over 30 minutes, then holding steady at 1000 users for 2 hours. Which test types are being combined?

medium

A. Load test and stress test

B. Stress test and spike test

C. Load test and soak test

D. Spike test and soak test

Solution

1. Step 1: Identify gradual increase phase

   Gradually increasing users from 100 to 1000 is typical of a load test to check normal traffic handling.

2. Step 2: Identify steady high load phase

   Holding 1000 users for 2 hours tests long-term stability, which is soak testing.

3. Final Answer:

   Load test and soak test -> Option C

4. Quick Check:

   Gradual increase + long hold = Load + Soak [OK]

Hint: Gradual rise + long hold = Load and soak tests [OK]

Common Mistakes:

• Confusing spike test with gradual increase
• Thinking stress test applies to steady load
• Mixing soak test with short duration tests

4. A tester wrote this description: 'Stress testing is done by suddenly increasing the load to check system limits.' What is wrong with this statement?

medium

A. Stress testing uses gradual load increase, not sudden

B. Stress testing checks long-term stability, not limits

C. Stress testing pushes beyond limits but not suddenly

D. Sudden load increase describes spike testing, not stress testing

Solution

1. Step 1: Understand stress testing

   Stress testing pushes the system beyond its limits to find breaking points, usually by increasing load beyond normal gradually or rapidly.

2. Step 2: Identify sudden load increase meaning

   Sudden load increase is characteristic of spike testing, which tests system reaction to abrupt changes.

3. Final Answer:

   Sudden load increase describes spike testing, not stress testing -> Option D

4. Quick Check:

   Sudden jump = Spike test, not stress test [OK]

Hint: Sudden jump means spike, not stress test [OK]

Common Mistakes:

• Mixing stress and spike test definitions
• Thinking stress test is only gradual
• Confusing soak test with stress test

5. A web app must be tested to ensure it can handle 500 users normally, survive sudden spikes to 2000 users, and remain stable under 500 users for 24 hours. Which combination of tests should be planned?

hard

A. Stress test, spike test, soak test

B. Load test, spike test, soak test

C. Load test, stress test, soak test

D. Stress test, load test, spike test

Solution

1. Step 1: Identify normal user handling test

   Testing 500 users normally is a load test to check typical performance.

2. Step 2: Identify sudden spike handling test

   Handling sudden spikes to 2000 users requires spike testing to check system reaction.

3. Step 3: Identify long-term stability test

   Remaining stable under 500 users for 24 hours is soak testing for endurance.

4. Final Answer:

   Load test, spike test, soak test -> Option B

5. Quick Check:

   Normal + sudden spike + long run = Load + Spike + Soak [OK]

Hint: Normal + spike + long run = Load, spike, soak tests [OK]

Common Mistakes:

• Replacing spike test with stress test incorrectly
• Confusing soak test with stress test
• Ignoring long-term stability requirement