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Non-functional testing

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Focuses on non-functional testing techniques as per ISO/IEC 9126, cover Reliability testing, Performance testing, Usability testing, Maintainability testing and Portability testing.

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Non-functional testing

  1. 1. A Look into Non-Functional Testing
  2. 2. intro • Functional testing : Functional testing demonstrates what a product does. • Non- Functional testing : Non-Functional testing demonstrates how well the product behaves. ***People’s desire to purchase or use product may be more affected by non-functional qualities.
  3. 3. Attributes of Good software * International Organization for Standardization (ISO) by the International Electro technical Commission (IEC).
  4. 4. Reliability testing is done to verify that software is capable of performing a failure- free operation for a specified period of time in a specified environment. Reliability Testing Why to do Reliability Testing ? • To find the structure of repeating failures. • To find the number of failures occurring is the specified amount of time. • To discover the main cause of failure Software reliability is measured in terms of mean time between failures (MTBF). MTTF = Mean time to failure MTTR = Mean time to repair MTBF = MTTF + MTTR
  5. 5. Performance Testing • Load testing - It is the simplest form of testing conducted to understand the behavior of the system under a specific load. Load testing will result in measuring important business critical transactions and load on the database, application server, etc., are also monitored. Performance testing, a non-functional testing technique performed to find the response time of the system with more users, more data or longer duration. • Stress testing - Stress testing is used to test the stability & response time of the system by applying more load then designed load. • Ex : JMeter, Load runner
  6. 6. Usability Testing • All the features should be easy understandable. • The language used should be simple and understandable by a common person. • Tool tip should be provided to help user. • Meaningful error messages should be shown. • Look and feel should be pleasant. Usability testing, a non-functional testing technique that is a measure of how easily the system can be used by end users. Key things to take care while performing usability testing:
  7. 7. Maintainability Testing • Verifying the development standards such as structured programming. • standards for database approach. • Verify if the input, the processing and the output are implemented separately • Verify if the application is modular. • Verify if the algorithms are optimized. The term maintainability corresponds to the ability to update or modify the application. This is an important as the application is subjected to changes throughout the software life cycle. Checklist for maintainability testing
  8. 8. Portability Testing Following are the attributes of the portability Testing: • Adaptability • Installability • Replaceability • Co-existence Portability testing is a process of testing how easy is to move software or product from one environment to another. It is measured in terms of maximum amount of effort required to transfer from one system to another system. The failures during the portability testing can help to identify defects that were not detected during unit and integration testing.

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