Spring Boot 控制器单元测试:无法加载 ApplicationContext

问题描述

我有一个简单的 spring boot 控制器，我想为它编写单元测试，但出现错误.我已经用谷歌搜索了几个小时，但仍然找不到解决方案.这是代码:

I have a simple spring boot controller and I want to write unit test for it but there is an error. I've googled for hours but still cannot find the solution. Here is code:

HelloController.java

HelloController.java

@RestController
public class HelloController {

    @Autowired
    private HelloService helloService;

    @GetMapping("/hello")
    public String sayHello(){
        return helloService.sayHello();
    }
}

HelloService.java:

HelloService.java:

@Service
public class HelloService {
    public String sayHello(){
        return "Hello";
    }
}

和单元测试文件:HelloControllerTest.java:

And unit test file:HelloControllerTest.java:

@RunWith(SpringJUnit4ClassRunner.class)
@WebMvcTest(HelloController.class)
public class HelloControllerTest {

    @Autowired
    private MockMvc mockMvc;

    @Mock
    private HelloService helloService;


    @Before
    public void setUp(){
        MockitoAnnotations.initMocks(this);
    }

    @Test
    public void sayHello() throws Exception {
        when(helloService.sayHello()).thenReturn("thach");
        mockMvc.perform(get("/hello"))
                .andExpect(status().isOk())
                .andExpect(content().string("thach"));
    }

}

但是有一个错误:

java.lang.IllegalStateException: Failed to load ApplicationContext

    at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContext(CacheAwareContextLoaderDelegate.java:99)
    at org.springframework.test.context.TestContext.getApplicationContext(TestContext.java:122)
    at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:105)
    at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:74)
    at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:312)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:211)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:288)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:284)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.lang.IllegalArgumentException: Cannot load an ApplicationContext with a NULL 'contextLoader'. Consider annotating your test class with @ContextConfiguration or @ContextHierarchy.
    at org.springframework.util.Assert.notNull(Assert.java:134)
    at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContextInternal(CacheAwareContextLoaderDelegate.java:57)
    at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContext(CacheAwareContextLoaderDelegate.java:91)
    ... 24 more

谁能帮帮我?我只是 Spring Boot 的新手

Can any one help me ? I am just a newbie to Spring boot

推荐答案

我遇到了类似的问题.请看下面的代码:

I had similar issue. Please see code below:

@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureMockMvc
public class ApplicationControllerTest {

@Autowired
MockMvc mockMvc;
@MockBean
ApplicationService applicationService;

@Test
public void testGetImagePath() throws Exception {

    RequestBuilder requestBuilder = MockMvcRequestBuilders.get("/application/get-image")
            .contentType(MediaType.IMAGE_GIF);

    MvcResult result = mockMvc.perform(requestBuilder).andReturn();
    System.out.println(result.getResponse());

}

请看下面的测试用例执行:

Please see below test case execution:

检查您使用的注释，即:1) @RunWith(SpringRunner.class)2)@SpringBootTest3) @AutoConfigureMockMvc

Check Annotations you used i.e. :1) @RunWith(SpringRunner.class)2) @SpringBootTest3) @AutoConfigureMockMvc

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