Difference Between Functional and Non-Functional Testing

Functional Testing

1. It focuses on testing the functionality of the software or system.
2. Verifies whether the software meets the functional requirements.
3. It involves testing the features and functionalities of the software, such as input/output, error handling, and user interface.
4. Tests are typically conducted using test cases or scenarios that validate the functional requirements.
5. It can be performed manually or using automated testing tools.
6. It was done after unit testing and integration testing and before system testing.

Non-Functional Testing

1. It focuses on testing the system's or software's non-functional components.
2. Checks to see if the software satisfies the non-functional requirements, including performance, security, usability, reliability, and compatibility.
3. It involves putting the software's quality characteristics, including response time, scalability, availability, and maintainability, to the test.
4. Several testing methods, including load testing, stress testing, security testing, and usability testing, are used.
5. Specialist testing techniques and frameworks are frequently needed to measure and assess non-functional requirements.
6. Many development lifecycle stages, including design, deployment, and maintenance, can be completed.

Examples of Functional testing are

• Unit Testing
• Smoke Testing
• Sanity Testing
• Integration Testing
• White box testing
• Black Box testing
• User Acceptance testing
• Regression Testing

Examples of Non-functional testing are

• Performance Testing
• Load Testing
• Volume Testing
• Stress Testing
• Security Testing
• Installation Testing
• Penetration Testing
• Compatibility Testing
• Migration Testing