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Before we move onto the next circle, where we will add enough functionality to our plug-in to fully integrate testing into programming and touch all of the activities necessary to build production-quality plug-ins, let's review what we've seen so far Much of the architecture of Eclipse is driven from the desire to build the whole environment out of plug-ins but to maintain fast startup Startup time should be constant, not proportional to the number of installed plug-ins In particular, you don't want to pay for plug-ins that are installed but not used If I have a C++ environment installed but I don't use it, it should have no impact at all on my computing experience Resolving the conflict between building the system out of lots of little pieces and being able to start up quickly drives the Eclipse architecture We laid out a design for our contributed JUnit plug-in as a core test runner with various presentations of tests and results Our goal in Circle One was to take the core test runner through the entire Contribution Circle PDE extends the basic Eclipse Java development functionality with support for editing the declarative plug-in description (the manifest, stored in pluginxml) PDE lets us run our new plug-in in a separate workspace Rather than clump all of our functionality together monolithically, we divided our system into the core test-running functionality and an extension point that would allow presentations to be notified of testing progress Extensions were only loaded the first time a test was run, keeping startup time to a minimum We packaged our plug-in for automated installation and discovery The plug-in was put into a feature and the feature was placed on an update site The plug-in is ready to be extended
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12 Interlude: Test-Driven Plug-In Development
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When we began writing the code for this book, we did it in a classic exploratory style We thought of some functionality we'd like to add We browsed in Eclipse to get some ideas about how to implement it We put some code together We looked at the result of the new code in the run-time workspace We repeated as necessary As we made progress, we quickly learned developing only in the exploratory style we were not able to write code without errors Say we had added some functionality Were we sure we hadn't broken something We aggressively refactored our code to improve its structure Were we sure we hadn't broken something We wanted a way to regain confidence in our code The benefits we were looking for from our development strategy were:
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Confidence We wanted to be able to add and restructure functionality without worrying about breaking something Learning We wanted to be able to quickly and confidently learn about new areas in Eclipse Design We wanted encouragement to think appropriately about design, especially the external interface of our code, before thinking about implementation
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One way we develop is with Test-Driven Development (TDD) The TDD cycle looks like this:
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Write a test for the next bit of functionality you have in mind The test should succeed only when the functionality has been implemented correctly Make the test compile by creating stubs for all the missing classes and methods referenced by the test Run the test It should fail Implement just enough functionality to get the test to succeed Clean up the implementation as much as possible, typically by removing duplication
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Running the tests thrown off by TDD provides us with confidence, especially in high-stress situations The tests can also provide objective feedback about whether we have learned a concept For us, writing the tests is as much an exercise in design as it is in testing But how do we apply the TDD cycle to plug-in development In this interlude we describe how to do test-driven plug-in development The resulting picture will be complex The fact that our example is about a plug-in for running tests makes it even more challenging to describe We therefore present the plug-in testing picture in three steps:
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We start with PDE JUnit It is an extension to JUnit for running plug-in tests Next we introduce a test setup for running plug-in tests Finally, we write a plug-in test for our contributed plug-in
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From now on we have to deal with different JUnit test runners and we therefore need to be more precise when talking about them These
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are the test runners and how we refer to them:
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Eclipse JUnit the JUnit support that is integrated in Eclipse PDE JUnit JUnit support for plug-in tests Contributed JUnit the JUnit support we implement in our example It has similar functionality to Eclipse JUnit It doesn't provide any plug-in testing support as offered by PDE JUnit
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