“…Mu2 [59], which has been developed in parallel with MO-TIF, is a fuzzer that integrates the findings of search-based unit test generation [60] to generate test input files with fuzzing: it relies on the mutation score to drive the generation of test inputs. Different from MOTIF, Mu2 tests every live mutant with each generated input and, in the file pool, prioritizes those files that increase the mutation score; the scalability of such choice is enabled by dynamic classloading and instrumentation, two options that are feasible for Java programs but not for the C/C++ programs targeted by MOTIF.…”