Question

I’m writing a unit test for a class A which extends class B. I’m using Mockito and I want to mock a org.slf4j.logger both classes to use. The problem is when class A calls on a method from class B, the mocked logger is not injected into class B so I get a NPE. Is there a way to successfully test this?

public class ClassA extends ClassB {

    @Inject
    private static final Logger LOGGER = LoggerFactory.getLogger(ClassA.class);

    public void classAMethod { 
        LOGGER.debug("u wot m8");
        this.classBMethod();
}

public class ClassB {

    @Inject
    private static final Logger LOGGER = LoggerFactory.getLogger(ClassB.class);

    public void classBMethod { 
        LOGGER.debug("u wot m8");
    }

}



public class ClassATest { 

    @InjectMocks 
    private ClassA classA = new ClassA
    @Mock
    private Logger mockLogger;

    @Test
    public void testClassA() {
          classA.classAMethod ();
          verify(mockLogger, (times, 2)).debug(Mockito.anyString());
    }
}

Answer 1

If you are using Java EE 6 @Inject it will not work outside the CDI container, this is part of the spec. If this is a unit test you have to provide it by yourself.