@Test
  public void testStopMaster() {
    conn.getAdmin().stopMaster().join();
    verify(masterStub, times(1)).stopMaster(assertPriority(HIGH_QOS), any(StopMasterRequest.class),
      any());
  }
Confirm that we will set the priority in {@link HBaseRpcController} for several admin operations.
hbase-client/src/test/java/org/apache/hadoop/hbase/client/TestAsyncAdminRpcPriority.java