@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()); }