“…For example, 12 studies considered ET [122, 125, 129, 132–134, 136–140, 143] and eight studies aimed at the fault detection rate [15, 122, 132, 134, 135, 139, 140, 143]. Three studies focus on path coverage [137, 138, 142], two studies deal with code coverage [122, 132], and two studies employ branch coverage criteria [129, 133]. Finally, some studies focussed on requirement coverage [15], twise coverage [123], mutation score [129], line coverage and MC/DC [134], and pairwise coverage [140].…”