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  1. WARNING • These slides are not optimized for printing or exam preparation. These are for lecture delivery only. • These slides are made for PowerPoint 2010. They may not show up well on other PowerPoint versions. You can download PowerPoint 2010 viewer from here. • These slides contain a lot of animations. For optimal results, watch in slideshow mode.

  2. Can a butterfly flapping its wings cause a tornado somewhere else in the world?

  3. Bug fix → break other code?

  4. Bug fix → break other code? REGRESSIONS [undesirable side effects of modifications]

  5. Bug fix → break other code? REGRESSIONS [undesirable side effects of modifications]

  6. Bug fix → break other code? REGRESSIONS [undesirable side effects of modifications]

  7. Stop butterflies from causing tornadoes: • preventing REGRESSIONS CS2103/T, Lecture 1, Part 3, [Jan 17, 2014]

  8. Stop butterflies from causing tornadoes: • preventing REGRESSIONS CS2103/T, Lecture 1, Part 3, [Jan 17, 2014]

  9. Stop butterflies from causing tornadoes: • preventing REGRESSIONS CS2103/T, Lecture 1, Part 3, [Jan 17, 2014]

  10. other test cases TEST CASE test input expected output Compare Regression testing mismatch = Software Under Test (SUT) actual output Locate bug modify How to prevent? bug located!

  11. other test cases TEST CASE test input expected output Compare Regression testing mismatch = Software Under Test (SUT) actual output Locate bug modify … is the re-running of existing tests to detect regressions. bug located!

  12. other test cases TEST CASE test input expected output Compare Regression test mismatch = Software Under Test (SUT) actual output Locate bug modify bug located!

  13. other test cases TEST CASE test input expected output Compare Regression test mismatch = Software Under Test (SUT) actual output Debug modify bug located!

  14. other test cases TEST CASE test input expected output Compare Regression test mismatch = Software Under Test (SUT) actual output Debug modify bug located!

  15. other test cases TEST CASE test input expected output Compare Regression test mismatch = Software Under Test (SUT) actual output Debug modify For this to work: 1. Document test cases 2. Automate testing bug located!

  16. Example SUT (Text UI Minesweeper)

  17. Example SUT (Text UI Minesweeper)

  18. Example SUT (Text UI Minesweeper)

  19. Example SUT (Text UI Minesweeper)

  20. Example SUT (Text UI Minesweeper)

  21. 1. Document test cases exploratory • testing • scripted testing Test case 1: input: expected: Test case 2:

  22. 2. Automate testing (for Text UIs) TEST CASE 1 test input expected output TEST CASE 2 test input expected output TEST CASE 3 test input expected output

  23. 2. Automate testing (for Text UIs) TEST CASE 1 test input expected output TEST CASE 2 test input expected output TEST CASE 3 test input expected output

  24. 2. Automate testing (for Text UIs) expected output test input expected output test input expected output test input

  25. 2. Automate testing (for Text UIs) C:\MinesweeperTextUI.exe FC actual.txt expected.txt Comparing files actual.txt and expected.txt FC: no differences encountered <input.txt >actual.txt C:\

  26. Do regression testing. REGRESSIONS exploratory or scripted? manual orautomated?

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