![]() ![]() They are mostly slow, difficult to use and written to meet the needs of academic There are other mutation testing systems for Java, but they are not widely used. Mutation testing is the gold standard against which all other types of coverage are measured. ![]() A suite that only partially tests code can still execute all its branches ( examples).Īs it is actually able to detect whether each statement is meaningfully tested, Much more common is code that is only partially testedīy its suite. The most extreme examples of the problem are tests with no assertions. It is therefore only able to identify code that It does not check that your tests are actuallyĪble to detect faults in the executed code. Traditional test coverage (i.e line, statement, branch, etc.) measures only which code ![]() If a unit test does not fail in this situation, it may indicate an issue with When the application code changes, it should produce different results andĬause the unit tests to fail. To put it another way - PIT runs your unit tests against automatically modified The quality of your tests can be gauged from the percentage of mutations killed. If your tests fail then the mutation is killed, if your tests pass then Mutation testing is conceptually quite simple.įaults (or mutations) are automatically seeded into your code, then ![]()
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