ITFT--Software testing


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ITFT--Software testing

  1. 1. Software Testing
  2. 2. Testing • “Testing is the process of executing a program with the intention of finding errors.” • “Testing can show the presence of bugs but never their absence.”
  3. 3. Levels of Testing • Unit Testing • Integration Testing • Validation Testing • Regression Testing • Alpha Testing • Beta Testing • Acceptance Testing • Other testing method
  4. 4. Unit Testing •Unit testing is the process of testing a singular item of software. An example would be a window/form which allows a user to choose two ways of launching the application.
  5. 5. Specification Testing •To perform specification testing, the analyst examines the specifications starting what the program should do and how it should perform under various conditions
  6. 6. Alpha Testing • An alpha release is the first working draft of a project. • An alpha release of a project is only for internal circulation. • Alpha testing is usually done “in-house” by team members. • Alpha releases are expected to have problems or to be incomplete.
  7. 7. Beta Testing •Beta testing is done with a wider array of testers. •Beta testers should be representative of real users. •These testers should be people who were not involved with the actual production. •Beta level bugs are typically less virulent than alpha bugs.
  8. 8. Acceptance Testing • Usually the tests are developed by the customer • User acceptance is a type of testing performed by the Client to certify the system with respect to the requirements that was agreed upon. This testing happens in the final phase of testing before moving the software application to Market or Production environment.
  9. 9. Regression testing • The purpose of regression testing is to confirm that a recent program or code change has not adversely affected existing features. • Regression testing is nothing but full or partial selection of already executed test cases which are re-executed to ensure existing functionalities work fine.
  10. 10. Test Methods • White box or glass box testing • Black box testing
  11. 11. White Box Testing • Knowing the internal workings of a product, test that all internal operations are performed according to specifications and all internal components have been exercised • Involves tests that concentrate on close examination of procedural detail • Logical paths through the software are tested • Test cases exercise specific sets of conditions and loops
  12. 12. White Box Testing Component code Test outputs Test data DerivesTests
  13. 13. Black Box Testing • Knowing the specified function that a product has been designed to perform, test to see if that function is fully operational and error free • Includes tests that are conducted at the software interface • Not concerned with internal logical structure of the software
  14. 14. Black Box Testing I e Input test data OeOutput test results System Inputs causing anomalous behaviour Outputs which reveal the presence of defects