This attribute records the tests that have been performed during the
bus test. It may contain zero or more of the following values.
selfTest: the bus tap self-test has been performed
clockSourceTest: the clock source test has been performed
broadcastTest: the broadcast test has been performed
pingTest: at least one ping test has been performed
Description of bits:
selfTest(0)
clockSourceTest(1)
broadcastTest(2)
pingTest(3)