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Where are the business challenges solved by mutation testing?

Mutation can help develop excellent tests. Mutation creates subtle variations of the program-under-test (called mutants), and challenges the tester to design or find test inputs that distinguish the mutants from the original. The resulting test set will find faults that lurk in complicated expressions and hard-to-reach sections of the code. Mutation tests ensure statement and branch coverage, but go far beyond them in their ability to reveal faults in the code.