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warning
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.
bug fix break other code1
Bug fix → break other code?

REGRESSIONS

[undesirable side effects of modifications]

bug fix break other code2
Bug fix → break other code?

REGRESSIONS

[undesirable side effects of modifications]

bug fix break other code3
Bug fix → break other code?

REGRESSIONS

[undesirable side effects of modifications]

slide9

Stop butterflies from causing tornadoes:

  • preventing

REGRESSIONS

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

slide10

Stop butterflies from causing tornadoes:

  • preventing

REGRESSIONS

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

slide11

Stop butterflies from causing tornadoes:

  • preventing

REGRESSIONS

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

slide12

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!

slide13

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!

slide14

other test cases

TEST CASE

test input

expected output

Compare

Regression test

mismatch =

Software Under Test (SUT)

actual output

Locate bug

modify

bug located!

slide15

other test cases

TEST CASE

test input

expected output

Compare

Regression test

mismatch =

Software Under Test (SUT)

actual output

Debug

modify

bug located!

slide16

other test cases

TEST CASE

test input

expected output

Compare

Regression test

mismatch =

Software Under Test (SUT)

actual output

Debug

modify

bug located!

slide17

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!

1 document test cases
1. Document test cases

exploratory

  • testing
  • scripted testing

Test case 1:

input:

expected:

Test case 2:

2 automate testing for text uis
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 uis1
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 uis2
2. Automate testing (for Text UIs)

expected output

test input

expected output

test input

expected output

test input

2 automate testing for text uis3
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:\

slide28

Do regression testing.

REGRESSIONS

exploratory or scripted?

manual orautomated?

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