How to test a Controller, specifying a Tiles ViewResolver?

[Gordon Brown]

Hi,

This is a pretty basic issue, but after Googling and trying various things I have had no success.

I suppose this is an integration test given that it'll also be testing my tiles configuration, though my initial intent was to find the simplest way to unit test the controller. I have actually written the simple controller I'm trying to test, and my tiles configuration works fine.

I have a Spring Boot app with three Java configuration classes (listed in the code below).As you can see from my failed attempt, I'm simply trying to test that a specific view name is returned, at this stage. What I haven't been able to do is configure the test so that it uses my existing ViewResolver. I've seen examples that create a new ViewResolver in the setup method, but... DRY.

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = {ViewsConfig.class, SecurityConfig.class, DatabaseConfig.class})
public class IndexControllerTest {

    private MockMvc mockMvc;

    @Before
    public void setUp() {
        mockMvc = standaloneSetup(new IndexController()).build();
    }

    @Test
    public void defaultRequestReturnsIndex() throws Exception {
        mockMvc.perform(get("/"))
               .andExpect(status().is2xxSuccessful())
               .andExpect(view().name("index"));
    }
}

The above code results in the following Exception:
java.lang.NullPointerException at org.apache.tiles.request.ApplicationAccess.register(ApplicationAccess.java:50)

How should I be going about this?

Thanks.

[Gordon Brown]

Just in case anyone comes across this issue in future: I needed to add

@WebAppConfiguration

...and the name of the class to be passed to the @SpringApplicationConfiguration was that of the Spring Boot Application e.g.

@SpringApplicationConfiguration(classes = AcumenApplication.class)

[Karthik Shiraly]

Thank you Gordy for coming back and telling us what worked. That'll help others in future. Have a cow for the effort!