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Examples in books, such as this one, tend to read as if there was an inevitability about the solution That s partly because we put effort into making the narrative ow, but it s also because presenting one solution tends to drive others out of the reader s consciousness There are other variations we could have considered, some of which might even resurface as the example develops For example, we could argue that AuctionSniper doesn t need to know whether it s won or lost the auction just whether it should bid or not At present, the only part of the application that cares about winning is the user interface, and it would certainly simplify the AuctionSniper and SniperSnapshot if we moved that decision away from them We won t do that now, because we don t yet know if it s the right choice, but we nd that kicking around design options sometimes leads to much better solutions
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In which we bid for multiple items, splitting the per-connection code from the per-auction code We use the table model we just introduced to display the additional bids We extend the user interface to allow users to add items dynamically We re pleased to nd that we don t have to change the tests, just their implementation We tease out a user request listener concept, which means we can test some features more directly We leave the code in a bit of a mess
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The next task on our to-do list is to be able to snipe for multiple items at the same time We already have much of the machinery we ll need in place, since our user interface is based on a table, so some minor structural changes are all we need to make this work Looking ahead in the list, we could combine this change with adding items through the user interface, but we don t think we need to do that yet Just focusing on this one task means we can clarify the distinction between those features that belong to the Sniper s connection to the auction house, and those that belong to an individual auction So far we ve speci ed the item on the command line, but we can extend that to pass multiple items in the argument list As always, we start with a test We want our new test to show that the application can bid for and win two different items, so we start by looking at the tests we already have Our current test for a successful bid, in First, a Failing Test (page 152), assumes that the application has only one auction it s implicit in code such as:
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applicationhasShownSniperIsBidding(1000, 1098);
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We prepare for multiple items by passing an auction into each of the ApplicationRunner calls, so the code now looks like:
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applicationhasShownSniperIsBidding(auction, 1000, 1098);
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Within the ApplicationRunner, we remove the itemId eld and instead extract the item identi er from the auction parameters
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public void hasShownSniperIsBidding(FakeAuctionServer auction, int lastPrice, int lastBid) { drivershowsSniperStatus(auctiongetItemId(), lastPrice, lastBid, textFor(SniperStateBIDDING)); }
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The rest is similar, which means we can write a new test:
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public class AuctionSniperEndToEndTest { private final FakeAuctionServer auction = new FakeAuctionServer("item-54321"); private final FakeAuctionServer auction2 = new FakeAuctionServer("item-65432"); @Test public void sniperBidsForMultipleItems() throws Exception { auctionstartSellingItem(); auction2startSellingItem(); applicationstartBiddingIn(auction, auction2); auctionhasReceivedJoinRequestFrom(ApplicationRunnerSNIPER_XMPP_ID); auction2hasReceivedJoinRequestFrom(ApplicationRunnerSNIPER_XMPP_ID); auctionreportPrice(1000, 98, "other bidder"); auctionhasReceivedBid(1098, ApplicationRunnerSNIPER_XMPP_ID); auction2reportPrice(500, 21, "other bidder"); auction2hasReceivedBid(521, ApplicationRunnerSNIPER_XMPP_ID); auctionreportPrice(1098, 97, ApplicationRunnerSNIPER_XMPP_ID); auction2reportPrice(521, 22, ApplicationRunnerSNIPER_XMPP_ID); applicationhasShownSniperIsWinning(auction, 1098); applicationhasShownSniperIsWinning(auction2, 521); auctionannounceClosed(); auction2announceClosed(); applicationshowsSniperHasWonAuction(auction, 1098); applicationshowsSniperHasWonAuction(auction2, 521); } }
auction-item-65432,
Following the protocol convention, we also remember to add a new user, to the chat server to represent the new auction