// Add Alarm testing code to the Alarm class
    
    public static void alarmTest1() {
	int durations[] = {1000, 10*1000, 100*1000};
	long t0, t1;

	for (int d : durations) {
	    t0 = Machine.timer().getTime();
	    ThreadedKernel.alarm.waitUntil (d);
	    t1 = Machine.timer().getTime();
	    System.out.println ("alarmTest1: waited for " + (t1 - t0) + " ticks");
	}
    }

    // Implement more test methods here ...

    // Invoke Alarm.selfTest() from ThreadedKernel.selfTest()
    public static void selfTest() {
	alarmTest1();

	// Invoke your other test methods here ...
    }