Inject a list of mocks during testing in Quarkus

I have a bean like this:

@ApplicationScoped
public class MyService {
    @Inject
    @All
    List<MyDataProvider> dataProviders;

    public List<String> getAllData() {
        var data = new ArrayList<String>();

        for (var provider : dataProviders) {
            data.add(provider.getData());
        }

        return data;
    }
}

And here is the MyDataProvider interface:

public interface MyDataProvider {
    String getData();
}

Let's say, there are tens of beans, implementing the MyDataProvider interface. I'd like to replace them all with a specific set of mocks within a unit test and I struggle to find a proper way to do this.

I can mock particular implementations of MyDataProvider using the @InjectMock or QuarkusMock.installMockForInstance(), I just don't know how to prevent injection of the rest non-mocked beans during the test (I need only a couple of mocks to test basic functionality).

So, is there a way to completely override the set of beans being injected in such a field during testing?

Solution

The solution I ended up with looks like this.

I replaced @All List<MyDataProvider> with Instance<MyDataProvider> and mocked its iterator() method:

@ApplicationScoped
public class MyService {
    @Inject
    Instance<MyDataProvider> dataProviders;

    public List<String> getAllData() {
        var data = new ArrayList<String>();

        for (var provider : dataProviders) {
            data.add(provider.getData());
        }

        return data;
    }
}

@QuarkusTest
class MyServiceTest {
    @Mock
    Instance<MyDataProvider> dataProviders;

    @InjectMocks
    MyService myService;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
    }

    @Test
    void doTest() {
        List<MyDataProvider> mocks = ... // initialize a list of MyDataProvider mocks

        Mockito.when(dataProviders.iterator()).thenReturn(mocks.iterator());

        // now myService.dataProviders will act as if it only contains mocked beans
    }
}

I don't find it particularly nice, I think there should be a more straightforward way to do this, but at least it works.