带有铸造字段的Mockito ClassCastException

Question

我正在尝试为以下代码编写单元测试：

 public DesiredCapabilities findCapability(Platforms platform, Types type, String browser, double platformVersion) throws Exception{
    Criteria criteria = getSession().createCriteria(BrowserCapabilities.class)
                                    .add(Restrictions.eq("status", ICommonConstants.DB_STATUS_ACTIVE))
                                    .add(Restrictions.eq("platformName", platform.getValue()))
                                    .add(Restrictions.eq("browserName", browser))
                                    .add(Restrictions.eq("platformVersion", platformVersion))
                                    .addOrder(Order.desc("browserVersion"))
                                    .setMaxResults(1);

    Object res = criteria.uniqueResult();
    if(res!=null)
        return this.prepareBrowserCapability((BrowserCapabilities)res);

    return null;
}

模拟代码是：

private BrowserCapabilityDAO mockBrowserCapability;
private Session mockSession;
private Criteria mockCriteria;
private Criterion mockCriterion;


@Before
public void init() {
    mockBrowserCapability = Mockito.spy(new BrowserCapabilityDAO());
    mockSession = Mockito.mock(Session.class, Mockito.RETURNS_DEEP_STUBS);
    mockCriteria = Mockito.mock(Criteria.class, Mockito.RETURNS_DEEP_STUBS);
    mockCriterion = Mockito.mock(Criterion.class, Mockito.RETURNS_DEEP_STUBS);
}


@Test
public void testFindCapability() throws Exception {

    DesiredCapabilities desiredCapability = new DesiredCapabilities();
    BrowserCapabilities mockBrowserCapabilities = getMockBrowserCapabilities();

    //Stub
    Mockito.doReturn(mockSession).when(mockBrowserCapability).getSession();
    Mockito.when(mockSession.createCriteria(Mockito.eq(BrowserCapabilities.class))).thenReturn(mockCriteria);
    Mockito.doReturn(mockCriteria).when(mockCriteria).add(mockCriterion);
    Mockito.when(mockCriteria.addOrder(Mockito.any(Order.class))).thenReturn(mockCriteria);
    Mockito.when(mockCriteria.setMaxResults(Mockito.anyInt())).thenReturn(mockCriteria);
    Mockito.when(mockCriteria.uniqueResult()).thenReturn((Object)mockBrowserCapabilities);
    //Mockito.doReturn(desiredCapability).when(mockBrowserCapability).prepareBrowserCapability(mockBrowserCapabilities);

    mockBrowserCapability.findCapability(Platforms.WINDOWS, Types.COMPUTER, "FF", 10.0);
}

private BrowserCapabilities getMockBrowserCapabilities() {
    BrowserCapabilities mockBrowserCapabilities = new BrowserCapabilities();
    mockBrowserCapabilities.setBrowserName("browserName");
    mockBrowserCapabilities.setBrowserVersion("browserVersion");
    return mockBrowserCapabilities;
} 

但是我在ClassCastException处获得了

return this.prepareBrowserCapability((BrowserCapabilities)res);

无法转换为com.common.xxx.persistence.beans.BrowserCapabilities。