Introduction to pairwise testing
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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: al8x.romanov@gmail.com
