@Test
  public void badClusterMapTest() throws Exception {
    String msg = "@@expected";
    clusterMap.exceptionToThrow = new IllegalStateException(msg);
    verifyFailureWithMsg(msg);
  }
Tests the case where the {@link ClusterMap} throws exceptions.
@throws Exception
ambry-frontend/src/test/java/com/github/ambry/frontend/GetPeersHandlerTest.java