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...Mutation testing the software is first tested using an initial method based on white box strategies we already discussed after complete taken up idea behind make a few arbitrary small changes to program at time each changed it called mutated change mutant against full test suite of if there exists least one case in for which gives incorrect result then said be dead remains alive even all cases have been exhausted enhanced kill process generation and killing mutants can automated by predefining set primitive that applied altering arithmetic operator changing value constant data type etc...