Automated Testing in Java

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for Web sites is performance testing Performance tests are useful for a site like League Planet in order to measure its response time under an expected load If the site is not performing as required, it can then be profiled in order to determine the source of the performance bottleneck
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While automated test frameworks have been around for many years now, many developers continue to use
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or equivalent calls to test their code Printing out variable values can work for small, manual test cases and debugging code but it is not a viable long-term testing solution Not only does printing out values generally mean only one person understands the tests, but these tests cannot usually be run unattended with every build of your site since they rely on someone to manually verify their results They also add a lot of clutter to your production code and are generally very brittle For example, changes to the code can often move a test print statement, thereby changing the expected output value Automated testing allows you as a developer to assign the task of testing large parts of your application to the automated test harness The extreme programming (XP) methodology even states that developers should create all of their tests up front, before the application is written By creating tests in advance of your code, you confirm that your application is complete after all of your tests pass Following the XP methodology, this chapter could have appeared much earlier in the book However, because this book does not focus on XP, this chapter comes at the end of the development cycle as is typical for other development processes such as iterative design and waterfall While you still must do some manual testing, especially of user interface components, much of your code can be reliably tested both quickly and often using automated tests Automated testing of your applications provides you with substantial benefits, including:
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Robustness: The test cases are separated from your development code and are therefore not subject to breakage caused by moving development code around Automation: Your tests can be run on demand before you check in your code and as part of your build Readability: The tests are located in separate classes with clear, measurable objectives This not only keeps your development code clean and readable but also allows others to more easily understand your tests
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CHAPTER 11 Testing
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Time Savings: Automated tests save you time by reducing the amount of manual, labor-intensive testing you have to do Having automated tests allows you to always do the safe thing and test your code before committing a change, even when under heavy time pressure Simplicity: Once you understand the automated test framework it is generally very easy to create and maintain your tests
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Overview of Iterations
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In this chapter you ll test the League Planet site in the following iterations:
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In Iteration 1 you develop a unit test for the Userjava class with the JUnit test framework In Iteration 2 you develop an integration test for the LoginServletjava servlet with the Cactus test framework In Iteration 3 you develop a system test for the League Planet site with the HttpUnit test framework In Iteration 4 you run a performance test on the update game results request mechanism of the League Planet site with the Eclipse Test and Performance Tools Platform (TPTP) In Iteration 5 you profile the update score page of the League Planet site with TPTP
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Iteration 1: Unit Testing with JUnit
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A unit test isolates and tests a small, defined piece of functionality In Java this typically translates to a method of a class [Abran2004] To unit test a method you create a series of tests that cover the interesting inputs Interesting inputs test boundary or edge cases For example, when testing a parameter that requires a String, along with testing expected input strings you should test the empty string and null You then isolate each test by creating stub objects for any foreign objects referenced by your code A good check to see if you have properly isolated a unit test is to count the number of classes the test imports If the test imports classes from many other places in your code it is probably not a good unit test Each test then asserts that the results returned and any exceptions thrown from the method are as expected for its inputs JUnit is the de facto standard automated test framework for Java It is an Open Source framework hosted on SourceForge, bundled with the Eclipse IDE, and available from
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