I need to use Redis in a service. I’m following https://quarkus.io/guides/redis-reference and so I have created the following service:

@ApplicationScoped
public class MyService {

  private final ReactiveValueCommands<String, String> commands;

  public MyService(ReactiveRedisDataSource redis) {
    commands = redis.value(String.class, String.class);
  }

  public String getString() {
    return "string";
  }

}

Now, I’m trying to test it with the following:

@QuarkusTest
class MyServiceTest {

  @InjectMock
  ReactiveRedisDataSource redis;

  @Inject
  MyService myService;

  @Mock
  private ReactiveValueCommands<String, String> commands;

  private AutoCloseable mocks;

  @BeforeEach
  void setUp() {
    mocks = MockitoAnnotations.openMocks(this);
    when(redis.value(String.class, String.class)).thenReturn(commands);
  }

  @AfterEach
  void afterEach() throws Exception {
    mocks.close();
  }

  @Test
  void getStringShouldReturnString() {
    assertEquals("string", myService.getString());
  }

}

Well, the problem with this test is that MyService‘s constructor is invoked before MyServiceTest#setUp method, which results in MyService#commands being null instead of being assigned MyServiceTest#commands. Is there a way to prevent this behaviour?