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This relies on the child class calling the parent class.
I'd suggest using the@afterClass annotation instead (and making the method public).
This will provide better ordering also because this methods with annotation are called after tearDownAfterClass

@nicolas-grekas I've added it in a new public method annotated with@afterClass. If you prefer I can just annotate theensureKernelShutdown method with@afterClass, but I found cleaner to split the actual logic from the test lifecycle event.