Unit Test of standard lib

[Abdessamed MANSOURI]

Hello all,

I was looking about how Java do unit tests of its standard library and i've
found in the code source of OpenJDK unit tests under test folder, my
question is why Java uses direct unit tests (using main) and it doesn't use
a powerfull framework as JUnit? i think it is possible to use it because
unit tests of standard lib are already written in Java.

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Thanks,

Abdessamed MANSOURI