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TestNG is a testing framework inspired from JUnit and NUnit but introduces some new functionalities that make it more powerful and easier to use. Run your tests in arbitrarily big threadpools with various policies available (all methods in their own thread, one thread per test class, etc...).
...ThreadLocalThe demand scenario is TransmittableThreadLocalthe potential demand scenario. If your business needs to "pass ThreadLocalvalues in the case of using threadpools and other execution components that will pool multiple threads ", it is the TransmittableThreadLocaltarget scenario.