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We ve adopted certain naming conventions for the methods of the helper objects If a method triggers an event to drive the test, its name will be a command, such as startBiddingIn() If a method asserts that something should have happened, its name will be descriptive;1 for example, showsSniperHasLostAuction() will throw an exception if the application is not showing the auction status as lost JUnit will call the two stop() methods after the test has run, to clean up the runtime environment In writing the test, one of the assumptions we ve made is that a FakeAuctionServer is tied to a given item This matches the structure of our intended architecture, where Southabee s On-Line hosts multiple auctions, each selling a single item
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The language of this test is concerned with auctions and Snipers; there s nothing about messaging layers or components in the user interface that s all incidental detail here Keeping the language consistent helps us understand what s signi cant in this test, with a nice side effect of protecting us when the implementation inevitably changes
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Now we have to make the test pass, which will require a lot of preparation We need to nd or write four components: an XMPP message broker, a stub auction that can communicate over XMPP, a GUI testing framework, and a test harness that can cope with our multithreaded, asynchronous architecture We also have to get the project under version control with an automated build/deploy/test process Compared to unit-testing a single class, there is a lot to do but it s essential Even at this high level, the exercise of writing tests drives the development of the system Working through our rst end-to-end test will force some of the structural decisions we need to make, such as packaging and deployment First the package selection, we will need an XMPP message broker to let the application talk to our stub auction house After some investigation, we decide on an open source implementation called Open re and its associated client library Smack We also need a high-level test framework that can work with Swing and Smack, both of which are multithreaded and event-driven Luckily for us, there are several frameworks for testing Swing applications and the way that they deal with Swing s multithreaded, event-driven architecture also works well with XMPP messaging We pick WindowLicker which is open source and supports
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1 For the grammatically pedantic, the names of methods that trigger events are in the imperative mood whereas the names of assertions are in the indicative mood
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End-to-end testing for event-based systems, such as our Sniper, has to cope with asynchrony The tests run in parallel with the application and do not know precisely when the application is or isn t ready This is unlike unit testing, where a test drives an object directly in the same thread and so can make direct assertions about its state and behavior An end-to-end test can t peek inside the target application, so it must wait to detect some visible effect, such as a user interface change or an entry in a log The usual technique is to poll for the effect and fail if it doesn t happen within a given time limit There s a further complexity in that the target application has to stabilize after the triggering event long enough for the test to catch the result An asynchronous test waiting for a value that just ashes on the screen will be too unreliable for an automated build, so a common technique is to control the application and step through the scenario At each stage, the test waits for an assertion to pass, then sends an event to wake the application for the next step See 14 for a full discussion of testing asynchronous behavior All this makes end-to-end testing slower and more brittle (perhaps the test network is just busy today), so failures might need interpretation We ve heard of teams where timing-related tests have to fail several times in a row before they re reported This is unlike unit tests which must all pass every time In our case, both Swing and the messaging infrastructure are asynchronous, so using WindowLicker (which polls for values) to drive the Sniper covers the natural asynchrony of our end-to-end testing
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