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Iteration 2: Integration Testing with Cactus
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since JUnit provides no easy way to modify the session information or the information submitted to your servlet When using the incremental approach for integration testing it is often necessary to create stub or dummy objects for those components that have not yet been included in the test mix When testing servlets, creating dummy objects can be a problem for two reasons First, you may have to create many dummy objects to mimic the behavior of the servlet container Creating many dummy objects can be very time consuming Second, creating many dummy objects is itself error prone, which defeats the purpose of creating the dummy objects in the first place Cactus is an automated testing framework that extends JUnit and runs inside your servlet container Like JUnit, Cactus is an Open Source project It is hosted at Apache, bundled with WTP, and available from
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http://jakartaapacheorg/cactus/
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Cactus can be used to run unit tests on your servlet and functional tests on your application, but neither of these uses is a strength of the Cactus framework For simplicity of your unit tests you are better off creating JUnit tests For your functional tests you will find it easier to create the tests using a test framework, such as HttpUnit, that can handle end-to-end scenarios within your application (We ll discuss HttpUnit in the next iteration) Also, servlet tests that involve the servlet container are really integration tests since they test your code working with the servlet container module Remember, integration testing your servlets still requires that you unit test the appropriate methods of your servlets This will help you catch any integration problems with the servlet container, which you likely will not have written The benefit of the Cactus framework is that it allows your tests to interact with the artifacts produced by the servlet container Cactus gives you access to several instance variables that a regular JUnit test does not have access to These instance variables, detailed here, can be very useful when testing your servlet:
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The request instance variable gives your test access to and lets it set request parameters passed to your servlet This variable allows you to mimic the input to your servlet from HTML forms or other requests For example, using this variable your test can pass different login credentials to the League Planet login servlet The request object extends javaxservlethttpHttpServletRequest It has three additional methods that allow you to set its properties Their function should be self-evident: setRemoteIPAddress, setRemoteHostName, and setRemoteUser
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CHAPTER 11 Testing
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The response instance variable gives your test access to the response object on which your servlet will set properties You can use this variable to test the results returned by your servlet The config instance variable provides your test access to the servlet configuration and allows it to set additional configuration parameters This allows your test to dynamically change the configuration of the servlet without restarting the application The config variable extends javaxservletServletConfig It has two additional methods that allow your test to set some of its properties: setInitParameter and setServletName In addition to these methods, when the getServletConfig method is called, a special servlet context is returned, which extends javaxservletServletContext Like the config variable, this servlet context allows you to dynamically change the configuration of the servlet container without restarting the container It contains two additional methods: getLogs, which returns the information logged by the log method, and setInitParameter, which sets a parameter as though it had been set in your application s deployment descriptor
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The session instance variable gives your test access to all the session properties for which your servlet has access It extends javaxservlethttpHttpSession
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Warning: If you are using an IBM 142 JDK, you may run into problems using Cactus We recommend you use an IBM 15 SDK for the integration tests You can download the 15 SDK from
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After installing the runtime you will need to change the runtime of both your server and the IceHockeyWeb project You can change the server runtime by editing the server on the Server Preferences page The IceHockeyWeb runtime can be changed by right clicking on the project in the Project Explorer and selecting Properties Select Java Build Path Select the Libraries tab and then select the JRE System Library and click Edit
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In this iteration, you will create an integration test for LoginServletjava in the IceHockeyWeb application (see Example 714 in 7) To create the test, do the following:
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