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java - MockMvc Controller 测试并返回 NullPointerException

转载 作者:行者123 更新时间:2023-12-02 00:57:58 27 4
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我在 RestController 测试中遇到 MockMvc 实例的问题,我为 PostMapping 和 GetMapping 创建了一个测试。在设置中创建了我的 Controller 的 MockMvc,但是当我在方法的测试中使用它时,我不断收到 NullPointerException。我是测试新手,有人可以帮我吗,谢谢

这是我的 Controller

    @RestController
@RequestMapping("/api/courses")
public class CourseController {
@Autowired
private CourseService courseService;

@GetMapping
public List<Course> GetAllCourses() {
return courseService.AllCourses();
}

@GetMapping("/{id}")
public ResponseEntity<Course> GetOneCourseByID(@PathVariable Long id) {
Course course = courseService.findOneCourse(id);
if(course == null){
return new ResponseEntity<Course>(HttpStatus.NOT_FOUND);
}
return new
ResponseEntity<Course>(course, HttpStatus.OK);
}

@PostMapping
public Course AddCourse(@RequestBody Course course){
courseService.addCourse(course);
return course;
}

@DeleteMapping("/{id}")
public String deleteCourse(@PathVariable Long id) {
return courseService.deleteCourse(id);
}

@PutMapping("/{id}")
public Course updateCourse(@RequestBody Course course) {
return courseService.updateCourse(course);
}
}

This is my service


@Transactional
@Service
public class CourseService {

@Autowired
private CourseRepository courseRepository;

public List<Course> AllCourses() {
return courseRepository.findAll();
}

public Course findOneCourse(Long id) {
return courseRepository.findOneById(id);
}

public Course addCourse(Course course) {
courseRepository.save(course);
return course;
}

public Course updateCourse(Course course) {
courseRepository.save(course);
return course;
}

public String deleteCourse(Long id) {
courseRepository.deleteById(id);
return "Deleted";

}

}

我已经使用 Mockito 为我的 Controller 创建了一个单元测试:

    @RunWith(MockitoJUnitRunner.class)
@SpringBootTest
public class CourseControllerTest {

private static Course course1;
private static List<Course> courseList = new ArrayList<>();

// inject the mock on the controller
@InjectMocks
private CourseController courseController;
// define mock MVC

private MockMvc mockMvc;

// mock the respository
@Mock
private CourseRepository courseRepository;

@Before
public void setUp() throws Exception {
mockMvc = MockMvcBuilders.standaloneSetup(courseController).build();
}

@BeforeEach
public void setupMethods() {
course1 = new Course();
course1.setId(13L);
course1.setName("Java Script");
course1.setDescription("Web Developing with Java Script");

Teacher teacher1 = new Teacher("Koen", "Groffieon", 26, "koen@capgemini.com");
Section section1 = new Section("Programming");

course1.getSection().add(section1);
course1.setTeacher(teacher1);
section1.getCourses().add(course1);
teacher1.getCourses().add(course1);
courseList.add(course1);
courseRepository.save(course1);
}

@Test
public void GetCourseTest() throws Exception {

when(courseRepository.findAll()).thenReturn(courseList);
mockMvc.perform(get("/api/courses"))
.andDo(print())
.andExpect(jsonPath("$", Matchers.hasSize(1)))
.andExpect(jsonPath("$.[0].id", is(13)))
.andExpect(jsonPath("$.[0].name", is("Java Script")))
.andExpect(MockMvcResultMatchers.status().isOk());

}

@Test
public void postCourseTest() throws Exception {

// define a mapper for json data
ObjectMapper mapper = new ObjectMapper();
String json = mapper.writeValueAsString(course1);

when(courseRepository.save(Mockito.any(Course.class))).thenReturn(course1);

this.mockMvc.perform(MockMvcRequestBuilders.post("/api/courses")
.contentType(MediaType.APPLICATION_JSON)
.content(json))
.andDo(print())
.andExpect(jsonPath("$.id", Matchers.is((course1.getId().intValue()))))
.andExpect(jsonPath("$.name", Matchers.is(course1.getName())))
.andExpect(status().isOk()

);
// verify(courseRepository,times(1)).save(Mockito.any(Course.class));
}
}

但是我遇到了以下问题:

java.lang.NullPointerException
at com.mockitoexample.controllers.CourseControllerTest.postCourseTest(CourseControllerTest.java:110)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.mockito.internal.runners.DefaultInternalRunner$1$1.evaluate(DefaultInternalRunner.java:46)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.mockito.internal.runners.DefaultInternalRunner$1.run(DefaultInternalRunner.java:77)
at org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:83)
at org.mockito.internal.runners.StrictRunner.run(StrictRunner.java:39)
at org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:163)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)

最佳答案

您需要将 CourseService 而不是 CourseRepository 注入(inject)到 Controller 中,然后对服务进行一些模拟测试,例如:

@Mock
private CourseService courseService;

//inside your GetCourseTest()
when(courseService.AllCourses()).thenReturn(courseList);

关于java - MockMvc Controller 测试并返回 NullPointerException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61076262/

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