Transcript Introduction to pairwise testing

Introduction to pairwise testing
Alexandr Romanov
Ciklum
What is pairwise testing? Google it!
Pairwise (all-pairs) testing is an effective test
case generation technique that is based on
the observation that most faults are caused
by interactions of at most two factors.
Pairwise-generated test suites cover all
combinations of two therefore are much
smaller than exhaustive ones yet still very
effective in finding defects.
Pairwise testing: give us an example
Simple
Combinations: 2x2 = 4
Pairwise testing: give us an example
Simple
Combination number
Bed linen
Tea
1
checked
checked
2
unchecked
checked
3
checked
unchecked
4
unchecked
unchecked
Pairwise testing: give us an example
Pairwise testing: give us an example
Combination
number
Seat type
Bed linen
Tea
Gypsies
Demobees
1
Berth
checked
checked
checked
checked
2
Coupe
checked
checked
checked
checked
3
Lux
checked
checked
checked
checked
4
Berth
unchecked
unchecked
unchecked
unchecked
5
Coupe
unchecked
unchecked
unchecked
unchecked
6
Lux
unchecked
unchecked
unchecked
unchecked
7
Berth
unchecked
unchecked
unchecked
checked
8
Coupe
unchecked
unchecked
unchecked
checked
...
...
...
...
...
...
Combinations (all): 3x2x2x2x2 = 48
Demo
Combination
Seattype
Bedlinen
Tea
Gypsies
Demobees
1
Berth
checked
checked
checked
checked
2
Berth
unchecked
unchecked
unchecked
unchecked
3
Coupe
checked
unchecked
checked
unchecked
4
Coupe
unchecked
checked
unchecked
checked
5
Lux
checked
checked
unchecked
unchecked
6
Lux
unchecked
unchecked
checked
checked
Combinations (pairwise technique applied) = 6
Do we need to do it manually?
Tools:
- All-pairs - free
- PICT - free
- Jenny - free
- Hexawise free/commercial
others;
Should we use pairwise everywhere?!
Always remember:
- Use pairwise testing technique when it’s
necessary;
- Explore your system under test;
- Select the right values to test with;
- Pay attention to high probable fail
combination;
Questions?
Alexandr Romanov
skype: alex_roma_nov
email: [email protected]