### Question:
DelayedService { public String response(long serverStartTime) { var currentTime = System.nanoTime(); if ((currentTime - serverStartTime) * 1.0 / (1000 * 1000 * 1000) < delay) { return "Delayed service is down"; } else { return "Delayed service is working"; } } DelayedService(int delay);  DelayedService(); String response(long serverStartTime);  }### Answer:
@Test public void testDefaultConstructor() { var obj = new DelayedService(); assertEquals(obj.response(System.nanoTime()), "Delayed service is down"); }