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The Spring framework provides a small suite of standard mock objects to aid in the creation of unit tests. Tools such as EasyMock are adequate for the creation of basic unit tests, but the Spring standard mock classes can make some tests less verbose, while allowing for more-sophisticated test behavior. Table 10-1 enumerates the standard mock object implementations provided with the Spring framework.
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Table 10-1. The Standard Spring Mock Object Classes
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ExpectedLookupTemplate SimpleNamingContext
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Can be substituted for the JndiTemplate helper class in applications that use JndiTemplate instances to access JNDI. Provides a simple JNDI context so code that looks up JNDI resources directly (without using JndiTemplate) can be provided with suitable mock objects. A substitute for the ExpressionEvaluator JSTL class when testing custom JSP tags. Used to provide the configuration parameters when testing Java EE filter implementations (avoids the need for a servlet container and a deployment descriptor). A mock version of the HttpServletRequest object supplied to servlets and JSPs (and to controller classes via the dispatcher). The counterpart of the MockHttpServletRequest, this is a mock version of the HttpServletResponse object supplied to servlets and JSPs. Used to provide a mock HttpSession object to web application components. Used to provide a mock multipart file-upload object to fake the results of a multipart form upload. Typically, this would be set into the MultipartFile attribute(s) of a form bean. Used to provide a mock request object to controllers expecting to receive multipart form uploads. This allows you to check that the multipart file is correctly bound to form properties or otherwise extracted from the request object correctly. Used to fake the PageContext object when testing custom JSP tags. Used to supply configuration parameters to servlets under test (avoids the need for a servlet container and a deployment descriptor).
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MockExpressionEvaluator MockFilterConfig
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CHAPTER 10 TESTING
This suite of tests is heavily oriented toward the testing of the presentation components because these are the classes that are likely to have the heaviest dependency on the normal Java EE way of doing things. For example, it is often desirable to configure a Java EE application by using JNDI resources. Because this is a process of dependency lookup, legacy code will be difficult to inject with the resource, but the SimpleNamingContext mock class can be used in a stand-alone environment to supply appropriate mock substitutes for the real resources being looked up.
Integration Testing
Unit testing requires you to test the components in isolation. The reverse testing the behavior of the components when connected is integration testing. Integration testing ensures that the various component APIs can exchange data. Various errors can be introduced if these methods are not tested together. For example, misassumptions about the purpose of a method are sometimes apparent only when a class provides real data, rather than dummy data, to the other components. Integration testing does not require any technologies specific to Spring, and there are no special techniques required. Integration testing is about verifying the behavior of the application as a whole so the internal details should not be relevant. When you need to perform partial integration tests (for example, testing from the web application layer down to a dummy database layer), the techniques shown already are applicable.
Web Testing
There are various tools to allow you to create tests of a web application. Two that I recommend are HttpUnit (http://httpunit.sourceforge.net/) and Selenium (www.openqa.org/ selenium/). These tools approach the problem of automating the testing of a GUI designed for manual operation in two different ways. Both HttpUnit and Selenium tests can be integrated into Maven builds. HttpUnit allows your unit test to connect directly to a web application without using a browser. You use the HttpUnit libraries to create a JUnit test case that specifies the inputs to provide and the outputs expected from each page of the application. These tests provide an excellent test to confirm that the back-end components correctly interpret the incoming web requests, but they are less effective in testing that the correct content is displayed to the user. Although there is some support for it, debugging and testing JavaScript-based issues is particularly difficult when using HttpUnit. Selenium allows you to create a test of the application by creating JavaScript-based scripts to drive the browser directly. The approach is considerably more complicated than the HttpUnit technique, but you have the advantage of using the same browser that your end users will be using. Any quirks in the rendering engine or script interpretation that
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