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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.


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


Bug fix → break other code?


Bug fix → break other code?

REGRESSIONS

[undesirable side effects of modifications]


Bug fix → break other code?

REGRESSIONS

[undesirable side effects of modifications]


Bug fix → break other code?

REGRESSIONS

[undesirable side effects of modifications]


Stop butterflies from causing tornadoes:

  • preventing

REGRESSIONS

CS2103/T, Lecture 1, Part 3, [Jan 17, 2014]


Stop butterflies from causing tornadoes:

  • preventing

REGRESSIONS

CS2103/T, Lecture 1, Part 3, [Jan 17, 2014]


Stop butterflies from causing tornadoes:

  • preventing

REGRESSIONS

CS2103/T, Lecture 1, Part 3, [Jan 17, 2014]


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!


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!


other test cases

TEST CASE

test input

expected output

Compare

Regression test

mismatch =

Software Under Test (SUT)

actual output

Locate bug

modify

bug located!


other test cases

TEST CASE

test input

expected output

Compare

Regression test

mismatch =

Software Under Test (SUT)

actual output

Debug

modify

bug located!


other test cases

TEST CASE

test input

expected output

Compare

Regression test

mismatch =

Software Under Test (SUT)

actual output

Debug

modify

bug located!


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!


Example SUT (Text UI Minesweeper)


Example SUT (Text UI Minesweeper)


Example SUT (Text UI Minesweeper)


Example SUT (Text UI Minesweeper)


Example SUT (Text UI Minesweeper)


1. Document test cases

exploratory

  • testing

  • scripted testing

Test case 1:

input:

expected:

Test case 2:


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


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


2. Automate testing (for Text UIs)

expected output

test input

expected output

test input

expected output

test input


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:\


  • Do regression testing.

REGRESSIONS

exploratory or scripted?

manual orautomated?


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