Spring 2.5 ships with great support for integration testing through the classes in the org.springframework.test package. These classes allow you to dependency inject your test cases off of your existing Spring configuration, either by using your production Spring configuration file or one you've defined especially for the test case. This post explains how to annotate your JUnit 4 test cases to be autowired, but there's a lot more too the new spring-test.jar and it works with JUnit 3.8 also.
public class MyService {
private final String name;
public MyService(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
<bean id="myService" class="org.sample.MyService" >
<constructor-arg value="simple service" />
</bean>
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
public final class SimpleAutowireTest {
@Autowired
private MyService service;
@Test
public void testServiceName() {
assertEquals("simple service", service.getName());
}
} <bean id="deliveryService" class="org.sample.MyService" >
<constructor-arg value="delivery service" />
</bean>
<bean id="accountingService" class="org.sample.MyService" >
<constructor-arg value="accounting service" />
</bean>
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"applicationContext.xml"})
public final class AdvancedAutowireTest {
@Autowired
@Qualifier("deliveryService")
private MyService service;
@Test
public void testServiceName() {
assertEquals("delivery service", service.getName());
}
}
As is standard with JUnit, each test method runs within its own instance of the TestCase. However, the Spring TestRunner will only create one ApplicationContext for all the instances of the test method. This means that if you're test method destroys the state of a singleton bean, then downstream tests methods using that bean will fail. The way to work around this is to annotate your method with the @DirtiesContext annotation. This tells the Spring TestRunner to reload the context between test methods. For instance, these tests will pass when annotated, but fail when not:
@Autowired
private MyConfigurableService service;
@Test
@DirtiesContext
public void testServiceName1() {
assertEquals("configurable service", service.getName());
service.setName("Updating Name");
}
@Test
@DirtiesContext
public void testServiceName2() {
assertEquals("configurable service", service.getName());
service.setName("Updating Name");
}
The dependencies for spring-test are: junit, spring-context, spring-core, spring-beans, spring-tx, and commons-logging. A sample Gradle script for your build is at href="http://svn.assembla.com/svn/SampleCode/spring-test/build.gradle.
All the code for this post (including Gradle build script and IDEA project) is posted at http://svn.assembla.com/svn/SampleCode/spring-test/ and can be downloaded through subversion with the following command:
svn co http://svn.assembla.com/svn/SampleCode/spring-test
