在控制器中返回null会破坏MockMvc



我使用MockMvc与Mockito,绘制大量的春季温室样本。我有一个简单的控制器返回一个字符串viewname,或null,如果有某种错误。它在servlet环境中工作得很好,但是当我尝试用MockMvc standaloneSetup对控制器进行单元测试时,我得到

javax.servlet.ServletException: Circular view path [register]: would dispatch back to the current handler URL [/register] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.)

这是我的控制器

@Controller
public class SignupController {
@RequestMapping(value="/register", method=RequestMethod.GET)
public RegistrationForm createNewRegForm(){
    return new RegistrationForm();
}
/**
 * Process a signup form submission.
 * Delegate to a {@link SignupServiceImpl} to actually complete the signin transaction.
 * Redirects the new member to the application home page on successful sign-in.
 */
@RequestMapping(value="/register", method=RequestMethod.POST)
public String signup(@Validated(Registration.class) RegistrationForm form, BindingResult formBinding) {
    if(formBinding.hasErrors())
        return null;
    boolean success = signupHelper.signup(form.getUser(), formBinding);
    return (!formBinding.hasErrors() && success) ? "redirect:/" : null;
}

}

和失败的测试:

public void signup_duplicateEmail() throws Exception {
    AccountManager accountRepository = mock(AccountManager.class);
    AccountAuthUtils authorization = mock(AccountAuthUtils.class);
    when(accountRepository.createAccount(any(User.class))).thenThrow(new EmailAlreadyOnFileException("roy@clarkson.com"));
    SignupServiceImpl gateway = new SignupServiceImpl(accountRepository, authorization);        
    SignupController signupController = new SignupController(gateway);
    MockMvc mockMvc = standaloneSetup(signupController).build();
    mockMvc.perform(post("/register").contentType(APPLICATION_FORM_URLENCODED)
                .param("user.username","habuma")
                .param("user.email","roy%40clarkson.com")
                .param("user.password", "letmein1")
                .param("confirmPassword", "letmein1"))
            .andExpect(MockMvcResultMatchers.status().isOk())
            .andExpect(MockMvcResultMatchers.forwardedUrl("/register.do"))
            .andExpect(MockMvcResultMatchers.model().hasErrors())
            .andExpect(MockMvcResultMatchers.model().attributeHasFieldErrors("registrationForm", "user.email"));
}

一个简单的遍历返回"/register "。在控制器中,do"而不是null表示失败,但我宁愿不改变我的代码来使测试工作。

我的猜测是这种差异的原因是因为在生产中你已经配置你的ViewResolver使用"/WEB-INF/"和可能的后缀。在您的独立测试设置中,您没有添加ViewResolver,因此默认情况下只是将视图名称转换为路径,此时它意识到它与请求路径相同。

至于。doc,你有什么观点吗,我们很快会添加一些东西,跟踪这里。

好吧,经过几个小时的努力,我终于明白了。

基本上,只要初始url与结束url相同,它就会给出这个问题。但是,您可以通过请求post("register.do") (servlet就是这样做的)来欺骗它,并检查它是否返回"register"。因此,我的解决方案是:

mockMvc.perform(post("/register.do").contentType(APPLICATION_FORM_URLENCODED)
            .param("user.username","habuma")
            .param("user.email","roy%40clarkson.com")
            .param("user.password", "letmein1")
            .param("confirmPassword", "letmein1"))
        .andExpect(MockMvcResultMatchers.status().isOk())
        .andExpect(MockMvcResultMatchers.forwardedUrl("register"))

现在它可以在测试和服务器环境中工作。

注:我希望所有这些。do的东西都有好的文档。使用了这么多年,我从来没有真正理解过它。

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