@Test
  public void nullThrottlersTest() throws Exception {
    DiskIOScheduler scheduler = new DiskIOScheduler(null);
    assertEquals("Unexpected i/o slice availability returned", Long.MAX_VALUE, scheduler.getSlice("jobType", "job", 0));
  }
Test for correct behavior when a null throttler map is passed in.
@throws Exception
ambry-store/src/test/java/com/github/ambry/store/DiskIOSchedulerTest.java