By Andreas Kuehlmann (auth.), Achim D. Brucker, Jacques Julliand (eds.)
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We still have to define what we mean by “exercise in a similar way”. This can be done, in principle, by choosing any white-box coverage criterion, to be applied to repOK. For instance, we can consider decision coverage on repOK; in this case, two inputs to the traversing routine (the code under test) would be considered equivalent if they make the decision points in repOK to evaluate to the same values. = null never evaluates to true in this case). 24 V. Bengolea et al. In general, notice that any white-box testing criterion Crit gives rise to a partition of the input space of the program under test, with each class in the partition usually capturing some path or branch condition expressed as a constraint on the inputs.
As the experiments show, for some white-box coverage criteria on the representation invariant, we obtain a performance in mutant killing that is comparable to that of bounded-exhaustive suites. In particular, we used a variant of decision coverage, called counting decision coverage, which takes into account the number of times each decision point in the program under test becomes true and false. This criterion, applied to the representation invariant, is useful in our context, since in general we observe that there is a relationship between the size of the structure and the number of times a particular decision point in the corresponding representation invariant evaluates to true or false.
Moreover, this process strongly depends on the structure of the repOK routine too. For instance, an if-then-else with a composite condition could alternatively be written as nested if-then-else statements with atomic conditions; such structurally different but behaviourally equivalent programs may have very different equivalence classes, for the same white-box criterion, and therefore our approach may result in different reduced suites. 4 On the Effectiveness of Reduced Test Suites In this section we evaluate the effectiveness of test suites reduced using the approach presented in the previous section.