![]() ![]() The main goal of Project Loom is to support a high-throughput, lightweight concurrency model in Java by exploring and incubating JVM features for the implementation of lightweight, user-mode threads or fibers-thus the project's name. The October update of Microsoft's Visual Studio Code (VS Code) for Java has arrived with lots of improvements in the code editing and debugging experience, thanks to support for the recently released Java 19, which included a preview of Virtual Threads and Structured Concurrency, part of Project Loom. If your tests fail then the mutation is killed, if your tests pass then Mutation testing is conceptually quite simple.News Microsoft Visual Studio Code for Java Now Supports Virtual Threads 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 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. Traditional test coverage (i.e line, statement, branch, etc.) measures only which code ![]() 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. ![]() The most extreme examples of the problem are tests with no assertions. Mutation testing is the gold standard against which all other types of coverage are measured.Ī 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. 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. ![]()
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