Growing Object-Oriented Software, Guided by Tests

Chapter 13. The Sniper Makes a Bid

In which we extract an AuctionSniper class and tease out its dependencies. We plug our new class into the rest of the application, using an empty implementation of auction until we’re ready to start sending commands. We close the loop back to the auction house with an XMPPAuction class. We continue to carve new types out of the code.

Introducing AuctionSniper

A New Class, with Dependencies

Our application accepts Price events from the auction, but cannot interpret them yet. We need code that will perform two actions when the currentPrice() method is called: send a higher bid to the auction and update the status in the user interface. We could extend Main, but that class is looking rather messy—it’s already ...