Injection of a mock object into an object to be tested declared as a field in the test does not work using Mockito?

Question

I have a class and I am injecting a proxy into my service.

Service service
{
    private ServiceProxy proxy;
    public Service(ServiceProxy proxy)
    {
           


        

Answer 1

Write your test class as this, which will initialize Service with a mock of ServiceProxy:

class ServiceTest
{
@Mock
ServiceProxy mockProxy;

//This will inject the "ServiceProxy" mock into your "Service" instance.
@InjectMocks
Service service = new Service(mockProxy);

@Before
public void init() {
//This will initialize the annotated mocks 
MockitoAnnotations.initMocks(this);
}

@Test
public void test() {
... 
}
}