@Before
  public void setUp() throws Exception {
    transactionQueryRepository = Mockito.mock(TransactionQueryRepository.class);
    OrderBookQueryRepository orderBookQueryRepository =
        Mockito.mock(OrderBookQueryRepository.class);

    listener = new TransactionEventListener();
    listener.setTransactionQueryRepository(transactionQueryRepository);
    listener.setOrderBookQueryRepository(orderBookQueryRepository);

    Mockito.when(orderBookQueryRepository.findOne(orderBookIdentifier.toString()))
        .thenReturn(createOrderBookEntry());
  }