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Mock Application Objects in Integration Tests
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As described above, adapter objects are passive, reacting to calls from our code Sometimes, adapter objects must call back to objects from the application Eventbased libraries, for example, usually expect the client to provide a callback object to be noti ed when an event happens In this case, the application code will give the adapter its own event callback (de ned in terms of the application domain) The adapter will then pass an adapter callback to the external library to receive external events and translate them for the application callback In these cases, we do use mock objects when testing objects that integrate with third-party code but only to mock the callback interfaces de ned in the application, to verify that the adapter translates events between domains correctly (Figure 82) Multithreading adds more complication to integration tests For example, third-party libraries may start background threads to deliver events to the application code, so synchronization is a vital aspect of the design effort of adapter layers; we discuss this further in 26
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Using mock objects in integration tests
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Part III
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One of our goals in writing this book was to convey the whole experience of test-driven software development We want to show how the techniques t together over a larger scale than the examples usually presented in books We make a point of including external components, in this case Swing and messaging infrastructure, since the stress points of this kind of approach are usually at the boundaries between code that we own and code that we have to work with The application that we build includes such complexities as event-based design, multiple threads, and distribution Another goal was to tell a realistic story, so we include episodes where we have to backtrack on decisions that turn out to be wrong This happens in any software development that we ve seen Even the best people misunderstand requirements and technologies or, sometimes, just miss the point A resilient process allows for mistakes and includes techniques for discovering and recovering from errors as early as possible After all, the only alternative is to leave the problems in the code where, generally, they will cause more expensive damage later Finally, we wanted to emphasize our culture of very incremental development Experienced teams can learn to make substantial changes to their code in small, safe steps To those not used to it, incremental change can feel as if it takes too long But we ve been burned too often by large restructurings that lose their way and end up taking longer unpredictably so By keeping the system always clean and always working, we can focus on just the immediate change at hand (instead of having to maintain a mental model of all the code at once), and merging changes back in is never a crisis
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Some of the code and output layout in this example looks a bit odd We ve had to trim and wrap the long lines to make them t on the printed page In our development environments we use a longer line length, which (we think) makes for more readable layout of the code
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9
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Commissioning an Auction Sniper
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In which we are commissioned to build an application that automatically bids in auctions We sketch out how it should work and what the major components should be We put together a rough plan for the incremental steps in which we will grow the application
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We re a development team for Markup and Gouge, a company that buys antiques on the professional market to sell to clients with the best possible taste Markup and Gouge has been following the industry and now does a lot of its buying online, largely from Southabee s, a venerable auction house that is keen to grow online The trouble is that our buyers are spending a lot of their time manually checking the state of an auction to decide whether or not to bid, and even missed a couple of attractive items because they could not respond quickly enough After intense discussion, the management decides to commission an Auction Sniper, an application that watches online auctions and automatically bids slightly higher whenever the price changes, until it reaches a stop-price or the auction closes The buyers are keen to have this new application and some of them agree to help us clarify what to build We start by talking through their ideas with the buyers group and nd that, to avoid confusion, we need to agree on some basic terms: Item is something that can be identi ed and bought Bidder is a person or organization that is interested in buying an item Bid is a statement that a bidder will pay a given price for an item Current price is the current highest bid for the item Stop price is the most a bidder is prepared to pay for an item Auction is a process for managing bids for an item Auction house is an institution that hosts auctions
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