Stability test is a type of software testing to check the quality and behavior of the software under different environmental parameters. It is defined as the ability of the product to continue to function over time without failure. It is a non-functional testing technique that focuses to stress the software component to the maximum. Stability testing is done to check the efficiency of a developed product beyond normal operational capacity which is known as the breakpoint. It has higher significance in error handling, software reliability, robustness, and scalability of a product under heavy load rather than checking the system behavior under normal circumstances.

Stability testing assesses stability problems. This testing is majorly intended to check whether the application will crash at any point in time or not.

Non-Functional testing is defined as a type of Software Testing to check non-functional aspects (performance, usability, reliability, etc) of a software application. It is designed to test the readiness of a system as per nonfunctional parameters which are never addressed by functional testing.

An excellent example of a non-functional test would be to check how many people can simultaneously login into a software. In fact, non-functional testing is equally important as functional tests and affects client satisfaction.

There are several different types of non-functional tests, and the most common ones are:

• Performance Test
• Stability (Load) Tests
• Stress Tests
• Volume Tests

Performance testing checks how well software components work. These tests find issues in software design and architecture performance.

This is typically done by:

• Measuring response times
• Identifying bottlenecks
• Locating failure points

Performance tests ensure software quality. They validate that it’s fast, scalable, stable, and reliable.

Stability testing checks how the software behaves under normal and peak conditions. This is done to determine how much work the software can handle before performance is affected.

You can do stability tests by running multiple applications simultaneously, subjecting a server to a lot of traffic, or downloading a large number of files.

Load tests are used to ensure fast and scalable software.

Stress testing checks how the software behaves under abnormal conditions. This determines the limit at which the software will break. It’s important to find out what happens when the system is under stress. Does the right error message display? Does the system fail? How will it recover?

Stress tests are used to analyze what happens when a system fails. This ensures that software is recoverable, stable, and reliable.

Volume testing finds out what happens to system performance when a huge volume of data is added to the database. This is done to identify what problems may occur with increasing volumes of data. It’s also known as flood testing. You can use volume tests to check if there’s any data loss, warning or error messages, or data storage issues.

Volume tests verify that systems respond as expected to certain volumes of data. This is important for ensuring performance and stability.

• Yielding confidence in the stability of the system or software application under test.
• Making sure that the system handles big programs.
• Operating the effectiveness of the system or software application.
• Checking the stability of the system under stress.