Stability Testing For Beginners

Stability Testing is a type of non-functional software testing performed to continuously measure a software application’s efficiency and ability to function over a long period. Stability testing’s main aim is to check if the software application crashes or fails over regular use at any point in time by exercising its full range of use.

Stability Testing checks a developed product’s efficiency beyond standard operational capacity, often to a breakpoint. There is greater significance in software reliability, error handling, robustness, and scalability of a product under load than checking the system’s behaviour under normal circumstances. This testing is intended to stress the software component to the maximum.


When a person purchases a new mobile phone,  knowingly or unknowingly, they perform a stability test. The user will save many documents, images, photos, videos,  etc. in the device memory. 

They will check if too much data stored has affected the performance of the device. This is an example of stability testing. Due to big data stored, our device may hang up sometimes, and then we need to delete some data or clear temporary files to make the device regain the performance. After this, the user will have a clear idea about the capacity of the system.

Another example is online purchase portals. During a sale, many people purchase commodities from the web portals. The performance of the website must satisfy user expectations. So, the testers need to test the website by keeping in mind the expected ‘rush,’ which is likely to happen in these sites during those days.

Process of Stability Testing

  • To determine the testing’s scope and objective, you must ensure that the Application Server does not crash during the Load Test executions.
  • Determine the Business issues, check the system performance, and load as per the end-user perspective.
  • Assign different responsibilities and Roles like -Creating a test plan, test case review, test execution, etc.
  • It ensures the test deliverables within the specified time.
  • It ensures proper Load Testing tools and experience team is present for the same.
  • It determines the Defect tracking and reporting, and there proper mapping with the requirements.
  • It measures the cost and risk involves in the testing. This will determine the value of each execution in terms of CPU utilization and memory.

Stability Testing Techniques

Stability Testing aims to improve the performance of the software. Many statistics need to be collected and should be measured while performing the testing. 

1. Disk: During the stability testing, it is essential to check the utilization of disk spaces that are provided. 

2. Memory Usage: A significant factor that needs to be checked is the memory usage during this test.

3. CPU: The CPU should also be efficient to handle all user requests.

4. Transactions per second: The total no of transactions completed should be made a note of. The transactions can either be successful or failed. This helps in getting a message of the actual transaction load on the system.

5. Throughput: The amount of data that the users receive from the server at a given time is the system’s throughput. The throughput of the system is measured in bytes. This data generated helps get the amount of load that the users create and manage it.

6. Hits per second: This helps us understand the number of users currently present on the server. Through this, you can determine the load per user generates to the server’s number of hits.

7. Transaction responses: This test will help you know the average time taken to perform transactions during the trial. It will help you get the server’s performance and determine how many transactions can be performed at a particular time. This information can help evaluate the time required to send the request to the server, the application server, and the database server.

Test Case for Stability Testing for CPU Performance

  • Verification of the system’s Upper Boundary. 
  • How to crash or restore a device. 
  • The cumulative number of completed transactions per order. 
  • If the transaction reaction remains constant or rises with time or not. 
  • How under heavy load the machine acts. 
  • Under heavy load, its reaction and behaviour.


  • It helps in getting a more stable system. 
  • It guarantees that even if there are many users and then work can be continued without interruption.
  • It ensures that there are no memory leaks, which may lead to unexpected failures.
  • It monitors the effectiveness of the system. 


  • The system may crash due to the extra load on the CPU or processor, resulting in data loss.

Problems if Stability Test is not done

The possible error that is faced,

  • The system crashes.
  • The system slows down.
  • The system encounters functionality problems
  • The design shows wired behavior

Stability Testing involves using the system with heavy users and measuring the performance parameters to verify whether a system can support the anticipated load.

Best Stability testing Tools

System Stability Tester

System Stability Tester is a multi-platform open-source clone of SuperPI and a GUI and a CLI. It is used for CPU and RAM burning, stressing, and benchmarking. This tool uses the method of letting the computer calculate Pi’s value up to 128 million digits. It consumes the capacity of your processor as long as the test runs are used for benchmarking.


  • Command-line interface 
  • Mode button.
  • Extended source code clean up and changes.
  • Display the installed physical memory, visible by the OS.
  • Supports Solaris 10/Sparc.
  • Supports AIX 5.3/Power.


It is free to use

Intel burn test

This tool focuses on helping to push the CPU to its maximum limit. If it survives this, then it can be checked for its stability.

stability testing


  • Better appearance.
  • Intuitive interface.
  • Real-time error checking.


It is free to use


What is stability testing?

Stability Testing is a type of non-functional software testing performed to continuously measure a software application’s efficiency and ability to function over a long period. Stability testing’s main aim is to check if the software application crashes or fails over regular use at any point in time by exercising its full range of use.

What are the objectives of stability testing

It helps to find the durability of the system.
Find the stability of the application and thereby increase the confidence of the developer.
Find the defect in the system in a stressful environment.
Overall evaluation and effectiveness of the product.
To ensures that the system can handle a large program.
To test the response time of an application.
To verify the database connectivity.

What is the software testing life cycle based on stability testing?

The different phases of the are enlisted below:
Requirement Analysis
Test Plan
Test Case Development
Test Environment Setup
Test Case Execution
Test Closure

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