PowerMockito 对私有方法的mock

// doReturn 不会调用真实的方法
PowerMockito.doReturn(approvalProcessModel).when(approval,"buildApprovalProcessDO",flowDO,userInfo);

// thenReturn 会执行真实的方法  PowerMockito.when(approval,"buildApprovalProcessDO",flowDO,userInfo).thenReturn(approvalProcessModel);

// 私有方法。
private ApprovalProcessModel buildApprovalProcessDO(LawsuitTaskCurrentFlowDO flowDO, HttpServletRequestUtil.UserInfo userInfo) {

}