@Before
  public void setUp() throws Exception {
    batchJobScheduler = BatchJobScheduler.getInstance();

    when(engine1.getExecutionId()).thenReturn("engine1");
    when(engine1.getExecutionId()).thenReturn("123");

    when(engine2.getExecutionId()).thenReturn("engine2");
    when(engine2.getExecutionId()).thenReturn("456");
  }