private static boolean getTraceOfCalls() {
        if (wasTimerStoppedAttempted.get() == null || wasTimerStoppedAttempted.get() == false) {
            wasTimerStoppedAttempted.set(true);
            return true;
        }
        return false;
    }
Used to be sure we wait for all calls to super class finish methods to terminate
before actually stopping the timer.
jgiven-timing/src/main/java/com/tngtech/jgiven/timing/ManageTimerInterceptor.java