    @Test
    public void handleSellTransactionStartedEvent() {

        testSubject.on(new SellTransactionStartedEvent(transactionIdentifier,
                                                       orderBookIdentifier,
                                                       portfolioIdentifier,
                                                       DEFAULT_TOTAL_ITEMS,
                                                       DEFAULT_ITEM_PRICE));

        verify(transactionViewRepository).save(argThat(new TransactionEntryMatcher(
                DEFAULT_TOTAL_ITEMS, 0, DEFAULT_COMPANY_NAME, DEFAULT_ITEM_PRICE, STARTED, SELL
        )));
    }