An Experimental Comparison of the Effectiveness of Branch Testing and Data Flow Testing

An experiment comparing the effectiveness of the all-uses and all-edges test data adequacy criteria was performed. The experiment was designed so as to overcome some of the deEeieneies of previous software testing experiments. A large number of test sets was randomly generated for each of nine subject programs with subtle errors. For each test set, the percentages of executable edges and definition-use associations covered were measured and it was determined whether the test set exposed an error. Hypothesis testing was used to investigate whether all-uses adequate test sets are more likely to expose errors than are alledges adequate test sets. All-uses was significantly more effective than all-edges for Eve of the subjects, and appeared guaranteed to detect the error in four of them. Further analysis showed that in four of these subjects, all-uses adequate test sets were more effective than all-edges adequate test sets of similar size. Logistic regression analysis was used to investigate whether the probability that a test set exposes an error increases as the percentage of defhdtion-use associations or edges covered by it increases. The evidence did not strongly support this cot@cture. Error exposing ability was shown to be strongly positively correlated to percentage of covered deEnit.ion-use associations in only four of the nine subjects. Error exposing ability was also shown to be positively correlated to the percentage of covered edges in four (different) subjects, but the relationship was weaker.