@Override
      public Void answer(InvocationOnMock invocation) throws Throwable {
        startedRequests.put((Long)invocation.getArguments()[0], true);
        return null;
      }
Checks what happens when stage has an execution command for
host component that has been recently deleted
@throws Exception
ambari-server/src/test/java/org/apache/ambari/server/actionmanager/TestActionScheduler.java