Jmockit 测试因 Override Validate() 方法的 null ponter 异常而失败答案

【问题标题】：Jmockit tests fail with null ponter exception for Override Validate() methodJmockit 测试因 Override Validate() 方法的 null ponter 异常而失败
【发布时间】：2015-07-30 04:47:41
【问题描述】：

@Override
    public void validate(FacesContext facesContext, UIComponent uiComponent,
            Object emailId) throws ValidatorException {
        int userId = 0;
        try {
            AddNewUserDAO addNewUserDAO = new AddNewUserDAO();
            userId = addNewUserDAO.getUserIdWithUserName(emailId.toString());
        } catch (Exception exception) {
            LOGGER.error(exception);
        }
        matcher = pattern.matcher(emailId.toString());
        if (!matcher.matches()) {
            FacesMessage msg = new FacesMessage(new MessageProvider().getValue("prometheus_emailvalidation"));
            msg.setSeverity(FacesMessage.SEVERITY_ERROR);
            throw new ValidatorException(msg);
        }
        if (userId != 0) {
            FacesMessage msg = new FacesMessage(
                    new MessageProvider().getValue("prometheus_userexists"));
            msg.setSeverity(FacesMessage.SEVERITY_ERROR);
            throw new ValidatorException(msg);
        }

    }

我正在尝试用 Jmockit 编写一个测试用例，但我得到空指针异常，在这种方法中我们使用数据库查询（userId = addNewUserDAO.getUserIdWithUserName(emailId.toString());）这就是为什么无法 mockit，如何在此类验证器方法中模拟数据库查询和其他类的对象实例化

【问题讨论】：

标签： java validation jsf jmockit

【解决方案1】：

Jmockit 测试因 Override 方法的 null ponter 异常而失败

像这样在测试用例中模拟面孔上下文。退出 emailId 时，您的异常上升。所以在@Test 中使用预期。

    @Test(expected = javax.faces.validator.ValidatorException.class)
public void testValidatorWithExistedMailId(@Mocked FacesContext faces) {
    EmailIdExistanceValidator emailExistanceValidator=new EmailIdExistanceValidator();
    UIComponent uiComponent=null;
    emailExistanceValidator.validate(faces, uiComponent, "exitedId@gmail.com");
    assertNotNull(FacesMessage.VALUES);
}

@Test()
public void testValidatorWithUnExistedMailId(@Mocked FacesContext faces,@Mocked FacesMessage msg) {
    EmailIdExistanceValidator emailExistanceValidator=new EmailIdExistanceValidator();
    UIComponent uiComponent=null;
    emailExistanceValidator.validate(faces, uiComponent, (Object)"unexitedId@gmail.com");
    assertNotNull(FacesMessage.VALUES);
}

【讨论】：