How to make resource test with Multipart feature

Question

I created my resources to handle some images, and I wanted to test them with JUnit's @ClassRule, as I did before. They look like this :

@Path("/myImage")
@POST
@Consumes(MediaType.MULTIPART_FORM_DATA)
public Response postImage(
       @FormDataParam("file") InputStream inputStream) {
//doStuff
}

Now, I wanted to test it, and I have a problem with it. I fought that this class rule will be ok

@ClassRule
public static final ResourceTestRule resources = ResourceTestRule.builder()
                .addResource(new MyResource())
                .addResource(new MultiPartBundle())
                .build();

But I still get an Error

org.glassfish.jersey.server.model.ModelValidationException: Validation of the application resource model has failed during application initialization.

[[FATAL] No injection source found for a parameter of type public ...

How to write a proper class rule for this issue?

Answer 1

The error is because you have not register the MutliPartFeature with the server. The MultiPartBundle (which registers the MultiPartFeature) is not something that is supported with the ResourceTestRule. So you just need to register it yourself

public static final ResourceTestRule resources = ResourceTestRule.builder()
                .addResource(new MyResource())
                .addProvider(MultiPartFeature.class) 
                .build();

Same with the client. You will also need to register the feature if you want to use multipart the serialize on the client side

resource.client().register(MultiPartFeature.class)..

You can see a full example here