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By Jeffrey Robert Stewart

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Sample text

Interface testing—the final frontier in unit testing—is one of the hardest types of testing to get right, and also one of the most worthwhile because the user interface layer in an application can be host to a lot of complex state management. A user interface also has a lot of logic that is business critical, and that is not served by traditional unit tests. Interface tests provide an effective way to test this logic by simulating user interactions and measuring that the behavior of the user interface is in accordance with the expected behavior.

It relies on the Spring framework and other, sister frameworks to provide the runtime functionality—to actually make these integrations work, to make them meaningful. As we move through the next section, remember that Spring itself has integrations with more technologies than any other technology and that half of the work of surfacing these technologies in Spring Roo is often just having a way to enable the integration in a Roo project. The best integrations, however, offer ways to improve development-time productivity with these technologies.

Spring MVC and Spring Web Flow work well together, providing a powerful combo-punch for all the challenges you might face. The majority of your application will typically be developed in Spring MVC, with Spring WebFlow filling in the gaps where you need stateful, “conversational” interaction. Spring WebFlow, once configured, works by reading in descriptions of “flows,” described using Spring namespaces. These flows describe how pages in should be strung together in sequences. Let’s look at the sample flow and folder that’s created when you install Spring Web Flow.

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