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Deciding the Shape of the Walking Skeleton a dummy server, not the real site At some point before going live, we would have had to test against Southabee s On-Line; the earlier we can do that, the easier it will be for us to respond to any surprises that turn up Whilst building the walking skeleton, we concentrate on the structure and don t worry too much about cleaning up the test to be beautifully expressive The walking skeleton and its supporting infrastructure are there to help us work out how to start test-driven development It s only the rst step toward a complete end-to-end acceptance-testing solution When we write the test for the rst feature, then we need to write the test you want to read (page 42) to make sure that it s a clear expression of the behavior of the system
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The Importance of Early End-to-End Testing We joined a project that had been running for a couple of years but had never tested their entire system end-to-end There were frequent production outages and deployments often failed The system was large and complex, re ecting the complicated business transactions it managedThe effort of building an automated, end-to-end test suite was so large that an entire new team had to be formed to perform the work It took them months to build an end-to-end test environment, and they never managed to get the entire system covered by an end-to-end test suite Because the need for end-to-end testing had not in uenced its design, the system was dif cult to test For example, the system s components used internal timers to schedule activities, some of them days or weeks into the future This made it very dif cult to write end-to-end tests: It was impractical to run the tests in realtime but the scheduling could not be in uenced from outside the system The developers had to redesign the system itself so that periodic activities were triggered by messages sent from a remote scheduler which could be replaced in the test environment; see Externalize Event Sources (page 326) This was a signi cant architectural change and it was very risky because it had to be performed without end-to-end test coverage
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The development of a walking skeleton is the moment when we start to make choices about the high-level structure of our application We can t automate the build, deploy, and test cycle without some idea of the overall structure We don t need much detail yet, just a broad-brush picture of what major system components will be needed to support the rst planned release and how they will communicate Our rule of thumb is that we should be able to draw the design for the walking skeleton in a few minutes on a whiteboard
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We nd that maintaining a public drawing of the structure of the system, for example on the wall in the team s work area as in Figure 41, helps the team stay oriented when working on the code
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To design this initial structure, we have to have some understanding of the purpose of the system, otherwise the whole exercise risks being meaningless We need a high-level view of the client s requirements, both functional and nonfunctional, to guide our choices This preparatory work is part of the chartering of the project, which we must leave as outside the scope of this book The point of the walking skeleton is to use the writing of the rst test to draw out the context of the project, to help the team map out the landscape of their solution the essential decisions that they must take before they can write any code; Figure 42 shows how the TDD process we drew in Figure 12 ts into this context
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