测试用例生成之 All-Pairs Testing

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Refer to: https://en.wikipedia.org/wiki/All-pairs_testing

All-pairs testing or pairwise testing is a combinatorial software testing method that, for each pair of input parameters to a system (typically, asoftware algorithm), tests all possible discrete combinations of those parameters. Using carefully chosen test vectors, this can be done much faster than an exhaustive search of all combinations of all parameters, by "parallelizing" the tests of parameter pairs. The number of tests is typically O(nm), where n and m are the number of possibilities for each of the two parameters with the most choices.

The reasoning behind all-pairs testing is this: the simplest bugs in a program are generally triggered by a single input parameter. The next simplest category of bugs consists of those dependent on interactions between pairs of parameters, which can be caught with all-pairs testing.^[1]Bugs involving interactions between three or more parameters are progressively less common,^[2] while at the same time being progressively more expensive to find by exhaustive testing, which has as its limit the exhaustive testing of all possible inputs.^[3]

Many testing methods regard all-pairs testing of a system or subsystem as a reasonable cost-benefit compromise between often computationally infeasible higher-order combinatorial testing methods, and less exhaustive methods which fail to exercise all possible pairs of parameters. Because no testing technique can find all bugs, all-pairs testing is typically used together with other quality assurance techniques such as unit testing,symbolic execution, fuzz testing, and code review.51Testing软件测试网 gYy&j,K2Te

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Download the tool: http://www.satisfice.com/tools.shtml51Testing软件测试网 S4EM"V/~Wo

http://www.satisfice.com/tools/pairs.zip51Testing软件测试网S1R5[O-P(s9{

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Usage:

To use Allpairs, prepare a tab-delimited table of parameters that you'd like to permute. The easiest way to do this is with Excel:

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Operating System51Testing软件测试网WA6a7G"x uE	Printer 6g7h;m]F3]0	Duplex
Win98 ;T$tgb3r9b0	HP 4050	Y
Win2K *p'X#hd5~3p0	HP 4100 nPwK p0	N rJ$on2A:NJ0
WinXP51Testing软件测试网r4f-h2lP