模拟网络服务时，我遇到异常

Question

** * @Mock              * WebService网站；              * @模拟              * DeactivationVO deactivateVO;              * /

Mockito.when( new WebService().invokeDeactivationWS(deactivateVO)).
    thenReturn(deactivateVO);

===主类===

deactivateVO = new WebService() .invokeDeactivationWS(deactivateVO);
 我在这里得到异常

  

[异常：类-WebService，方法-invokeDeactivationWS。   停用WebService的值为NULL /空。]

if(!deactivateVO.isStatus()) errorList.add(deactivateVO); 
else { empList.add(emp); System.out.println("Deactivated " + emp.getCid() + ": " + deactivateVO.isStatus()); }