This attribute records the reason why the test was terminated. The
reasons are:
testCountReached: the test ran the number of times specified in the
attribute testCount and ended normally.
error: the test was terminated by an error that is recorded in the
natureOfError attribute.
neverStarted: the test was never started.
stoppedByOperator: the test was terminated by the Stop command.
testTimeExpired: the duration of the test expired.
testRunning: the test is still running.
unknown: the test terminated for unknown reasons.
internalError: An internal error terminated the test.