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Currently you cannot jump between a test and its source, nor use Test File to run the test corresponding to a source file with the main source selected. Should sniff <junit> to see which source roots contain unit tests and make a guess as to the correspondence.
Actually ActionProviderImpl already has code to run the test for a source. Need a MultipleRootsUnitTestForSourceQueryImplementation to make it work.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss