java Spring MVC：如何从返回字符串的控制器方法对模型的属性进行单元测试？
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Spring MVC: How to unit test Model's attribute from a controller method that returns String?
提问by user2652379
For example,
例如，
package com.spring.app;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
/**
* Handles requests for the application home page.
*/
@Controller
public class HomeController {
@RequestMapping(value = "/", method = RequestMethod.GET)
public String home(final Model model) {
model.addAttribute("msg", "SUCCESS");
return "hello";
}
}
I want to test model's attribute and its value from home()using JUnit. I can change return type to ModelAndViewto make it possible, but I'd like to use Stringbecause it is simpler. It's not must though.
我想使用 JUnit测试model的属性及其值home()。我可以将返回类型更改ModelAndView为使其成为可能，但我想使用String它，因为它更简单。但这不是必须的。
Is there anyway to check modelwithout changing home()'s return type? Or it can't be helped?
无论如何要检查model而不更改home()的返回类型？还是无能为力？
回答by Sergii Getman
You can use Spring MVC Test:
您可以使用Spring MVC 测试：
mockMvc.perform(get("/"))
.andExpect(status().isOk())
.andExpect(model().attribute("msg", equalTo("SUCCESS"))) //or your condition
And hereis fully illustrated example
而在这里充分说明例子
回答by user2652379
I tried using side effect to answer the question.
我尝试使用副作用来回答这个问题。
@Test
public void testHome() throws Exception {
final Model model = new ExtendedModelMap();
assertThat(controller.home(model), is("hello"));
assertThat((String) model.asMap().get("msg"), is("SUCCESS"));
}
But I'm still not very confident about this. If this answer has some flaws, please leave some comments to improve/depreciate this answer.
但我对此仍然不是很有信心。如果这个答案有一些缺陷，请留下一些评论来改进/贬低这个答案。
回答by mh-dev
You can use Mockito for that.
你可以使用 Mockito。
Example:
例子：
@RunWith(MockitoJUnitRunner.class)
public HomeControllerTest {
private HomeController homeController;
@Mock
private Model model;
@Before
public void before(){
homeController = new HomeController();
}
public void testSomething(){
String returnValue = homeController.home(model);
verify(model, times(1)).addAttribute("msg", "SUCCESS");
assertEquals("hello", returnValue);
}
}
