Let's imagine a Spring 3.1 web mvc application using MySql via Hibernate JPA via DAO's.
One has to write tests for the controllers without deploying the application and using an in-memory database (like hsqldb:mem for example). In other words, one should be able to run tests on a local PC.
How can this be achieved? Can someone provide a detailed example of how to write tests for such a controller? How should @ContextConfiguration be configured? How to retrieve a WebApplicationContext for testing purposes locally? Should one maintain a hibernate-test.cfg.xml?
Update
I am not talking only about unit testing, I am talking about integration testing.
Solution
To make this complete on top of Sean Patrick Floyd's answer, here is a solution inspired from here:
Example of service:
public interface MarkingService {
public String markItem(String item);
}
Example of controller using service
@Controller
public class TestableController {
@Autowired
private MarkingService markerService;
@RequestMapping(value = "mark/{name}")
public String mark(Model ui, @PathVariable String name){
String value = this.markerService.markItem(name);
ui.addAttribute("mark-value", value);
return "mark-show";
}
}
Mock of service to test controller:
public class MarkingServiceMock implements MarkingService {
@Override
public String markItem(String item) {
return "mockValue";
}
}
Config object for test configuration:
@Configuration
public class TestableControllerConfig {
// We return a mock to test the controller layer
@Bean
public MarkingService markingService() {
return new MarkingServiceMock();
}
}
Controller test:
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes={TestableControllerConfig.class})
public class TestableControllerTest {
// Will be injected with TestableControllerConfig.markingService()
@Autowired
private MarkingService markerService;
@Test
public void testController() {
// ...
}
}
Assuming the service layer relies on DAO's, it is easy to inject implementations based on in-memory db too.
