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CHAPTER 10 TESTING SPRING MVC APPLICATIONS
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It s very important that whenever you use the AbstractTransactionalStringContextTests class that a PlatformTransactionManager can be found, by type, in the ApplicationContext created for the test. This class is able to run without a transaction manager; however, this will likely lead to unwanted behavior, and most likely behavior that is different than production deployment. If you wish to ignore the fact that no transaction manager exists, you must turn off dependency checking, as shown in Listing 10-15. The AbstractDependencyInjectionSpring ContextTests by default will attempt to account for all dependencies by type, but you can change this behavior with the setDependencyCheck() method called from the constructor of your test class. Listing 10-15. Turning Off Dependency Checking If No Transaction Manager Exists public HomeControllerIntegrationTest() { setDependencyCheck(false); } The ApplicationContext is configured from the list of resource names returned by the getConfigLocations() abstract method. All of your test classes must implement this method and return one or more resource names pointing to ApplicationContext configuration files. All of these files will be combined into a single ApplicationContext to be used during testing. Any Dependency Injection is performed using this ApplicationContext as a source.
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In our experience, it s best to use resource names relative to the classpath, as that makes it easier to Tip
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run the tests in different environments and IDEs.
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The Spring integration test base classes override the setUp() method and mark it as final, but do provide life cycle callback methods for subclasses that require per-test method initialization. For transactional tests, two methods are provided: onSetupBeforeTransaction() to be called before the transaction is started, and onSetupAfterTransaction() to be called after the transaction is started. Both callbacks are called inside setUp(), and thus before every single test method. For our example, we have implemented onSetupBeforeTransaction() in order to simply initialize any required testing stubs. Because the transactional test cases are subclasses of AbstractDependencyInjection SpringContextTests, we provide a setHomeController() method so that our test class can avoid the manual lookup of dependencies from the ApplicationContext. The dependencies are resolved by type via the autowiring algorithm, and will be re-injected before every test method. Of course, because the Controller class originates from the ApplicationContext, all of its dependencies will be injected as well. The assumption at this point is that the class under test should be fully initialized as if it were running in production. The actual test method, testRequest(), is written and run just like any other JUnit test method. However, during the method a transaction is live, and unless setComplete() is called, at the end of testRequest() the transaction will be rolled back.
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CHAPTER 10 TESTING SPRING MVC APPLICATIONS
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Create and Use a Special ApplicationContext for Tests Only A common question regarding Spring s integration test support classes is, Should I create a custom ApplicationContext configuration for my tests Our initial answer to this question is no, for a good reason. We feel that much of the purpose for integration tests is to test the configuration of the application as it will run in production. There s rarely another good opportunity to test all that XML, including external configurations such as Hibernate mapping files, before a deployment. It is possible that your configuration will require extra bean definitions to replace objects found only inside your J2EE container, such as connection pools or transaction managers. If your application requires these container-provided resources, you can create a testOnlyApplicationContext.xml configuration with bean definitions for those external resources. Spring can easily host connection pools and transaction managers, which you can use when running the code outside of the container. Through intelligent modularization of the configuration files, you will find it easy to swap bean definitions at test runtime. Role of the Application Server It s important to mention that integration tests are still intended to be run outside of the application server. Even though the full Spring ApplicationContext is constructed, the test should still run without being deployed. Both unit tests and integration tests must still run as quickly as possible, and testing outside the application server is the only way to run the tests and get immediate feedback. Testing inside the container is another way to perform integration tests, but should be avoided due to the time it takes to run the tests. Any test that becomes a hassle to run will quickly fall out of fashion and thus usefulness. We discourage requiring an application server for tests. If your application requires the application server to run, it s possible that it is not taking advantage of the configuration options provided by Spring. As mentioned, even if you are using the server s connection pool during deployments, you can use Spring to create a connection pool for test runs.
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Integration tests ensure that the application is wired and configured correctly by creating a full Spring ApplicationContext for the test class. Spring provides base classes for easy implementation of dependency injected and transactional tests, making it easy and safe to create tests that exercise multiple layers of the system, including the database. These types of tests follow the basic guidelines of unit tests, except they explicitly are testing how multiple components of the system interact. This is an important testing step, as it checks that all the XML is configured correctly, and usually that the database mappings are correct as well. Spring s AbstractDependencyInjectionSpringContextTests class performs autowiring by type on the test class itself to populate it with all of its dependencies. These dependencies are normally the classes under test, and thus enter the test fully wired and configured.
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