How to use @InjectMocks and initMocks() with an object that has a required String parameter?

Question

Given a component to test that requires a non-mockable class (String) in it's constructor injection, like this:

public class MyService {     @Inject     public MyService(String param1, SomeObject param2) {             ...     } } 

I want to use Mockito to test it with a test harness like this:

public class MyServiceTests {     @Mock     private SomeObject someObject;      @InjectMocks     private MyService service;      @Before     public void setUp() {         MockitoAnnotations.initMocks(this);     } } 

Problem is, I can't @Spy or @Mock Strings (because String is a final class). So how can I use Mockito and "inject" a specific String value for the param1 argument to MyService's constructor (or otherwise test this class that requires a non-null String be passed)?

Answer 1

I think the simple answer is not to use @InjectMocks, and instead to initialise your object directly. The only downside I can see is that you're not testing the injection, but then with @InjectMocks, I think you'd be testing it with Mockito's injection implementation, rather than your real framework's implementation anyway, so no real difference.

I'd do:

public class MyServiceTests {   @Mock   private SomeObject someObject;    private MyService service;    @Before   public void setUp() {     service = new MyService("foo", someObject);   } }