BouncerTestV1.java

@RunWith(MockitoJUnitRunner.class)
public class BouncerTest {
    @Mock
    private EntranceChecker mockEntranceChecker;
    
    @Mock
    private Person mockInListPerson;
    
    @Mock
    private Person mockNotInListPerson;
    
    private Bouncer bouncer;
    
    @Before
    public init() {
        Mockito.when(mockEntranceChecker.isInTheGuestList(mockInListPerson)).thenReturn(true);
        Mockito.when(mockEntranceChecker.isInTheGuestList(mockNotInListPerson)).thenReturn(false);                     
        this.bouncer = new Bouncer(mockEntranceChecker);
    }

    @Test
    public boolean shouldBlock_nullPerson_notBlock() {
      boolean result = bouncer.shouldBlock(mockInListPerson);
      Assert.assertTrue(result);
    }
    
    @Test
    public boolean shouldBlock_nullPerson_block() {
      boolean result = bouncer.shouldBlock(mockNotInListPerson);
      Assert.assertTrue(result);
    }
}