Testing components with Mockito

testing.java

     @Mock
    private ComponentManager componentManager;

    @Mock
    private HostDetails hostDetails;

    @InjectMocks
    private HostInfoComponent testObject = new HostInfoComponent();

    @Before
    public void setUp() throws Exception {
        testObject.initialize(COMPONENT_JID, componentManager);
    }   

    @Test
    public void testComponentAutomaticallySendsOutSubscriptionToRosterRequests() throws Exception {

        Presence expectedSubscriptionPresence = new Presence(Presence.Type.subscribe);
        expectedSubscriptionPresence.setTo(HOST_JID);
        expectedSubscriptionPresence.setFrom(COMPONENT_JID);

        Presence subscribePresence = new Presence(Presence.Type.subscribe);
        subscribePresence.setFrom(HOST_JID);

        testObject.handlePresence(subscribePresence);

        verify(componentManager).sendPacket(any(Component.class), argThat(equalTo(expectedSubscriptionPresence)));

    }

    @Test
    public void badRequestReturnedWhenRoomTypeNotAValidType() throws Exception {
        testObject.handlePresence(createInitialRoomJoinPresenceWithInvalidType());
        Packet errorPacket = new Presence();
        errorPacket.setError(PacketError.Condition.bad_request);
        ArgumentCaptor<Packet> argument = ArgumentCaptor.forClass(Packet.class);
        verify(componentManager).sendPacket(Matchers.<Component>anyObject(), argument.capture());
        Packet packetToSend = argument.getValue();
        assertEquals(PacketError.Condition.bad_request, packetToSend.getError().getCondition());
        assertEquals(COMPONENT_JID, packetToSend.getFrom());
        assertEquals(FROM_USER, packetToSend.getTo());
    }