@MockBean 不适用于带有 JUnit5 和 Spring Boot 2 的 @WebMvcTest？
@MockBean doesn't work for @WebMvcTest with JUnit 5 and Sping Boot 2?
我在 Whosebug 上研究了类似的问题，但在我的案例中找不到根本原因。
上下文：
我在 SpringBoot 2 中有 @RestController，依赖于 BookSearcherService。我想模拟 BookSearcherService 以便对控制器进行单元测试。
错误：
org.springframework.web.util.NestedServletException: Request
processing failed; nested exception is java.lang.NullPointerException
at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1013)
at
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) at
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
at
org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:71)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) at
org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:166)
at
org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133)
at
org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at
org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133)
at
org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)
at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at
org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133)
at
org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at
org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133)
at
org.springframework.test.web.servlet.MockMvc.perform(MockMvc.java:182)
at
com.search.book.Booksearcher.controller.BookSearcherControllerMockMvcTest.canListAll(BookSearcherControllerMockMvcTest.java:54)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498) at
org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:532)
at
org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115)
at
org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod(TestMethodTestDescriptor.java:171)
at
org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
at
org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:167)
at
org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:114)
at
org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:59)
at
org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:108)
at
org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
at
org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:98)
at
org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:74)
at java.util.ArrayList.forEach(ArrayList.java:1257) at
org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at
org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:112)
at
org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
at
org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:98)
at
org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:74)
at java.util.ArrayList.forEach(ArrayList.java:1257) at
org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at
org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:112)
at
org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
at
org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:98)
at
org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:74)
at
org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
at
org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at
org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
at
org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:220)
at
org.junit.platform.launcher.core.DefaultLauncher.lambda$execute(DefaultLauncher.java:188)
at
org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:202)
at
org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:181)
at
org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)
at
org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:89)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)
Caused by: java.lang.NullPointerException at
com.search.book.Booksearcher.controller.BookSearcherController.listAll(BookSearcherController.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498) at
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:189)
at
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
at
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
at
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892)
at
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797)
at
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)
at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)
... 59 more
代码：
BookSearcherController.java:
@RestController
@RequestMapping("/book")
@RequiredArgsConstructor
public class BookSearcherController {
private BookSearcherService bookSearcherService;
@GetMapping(path = "/list", produces = { "application/json" })
@ResponseBody
public List<BookDto> listAll() {
return bookSearcherService.listAll();
}
}
BookSearcherService.java:
@Service
public class BookSearcherService {
private BookSearcherCrudService bookSearcherCrudService;
@Autowired
void setBookSearcherRepository(BookSearcherCrudService bookSearcherCrudService) {
this.bookSearcherCrudService = bookSearcherCrudService;
}
private BookSearcherRepository bookSearcherRepository;
@Autowired
void setBookSearcherRepository(BookSearcherRepository bookSearcherRepository) {
this.bookSearcherRepository = bookSearcherRepository;
}
public List<BookDto> listAll() {
List<Book> books = bookSearcherRepository.findAll();
return books.stream()
.map(bookSearcherCrudService::toDto)
.collect(Collectors.toList());
}
}
BookSearcherControllerMockMvcTest.java:
@WebMvcTest(controllers = BookSearcherController.class)
public class BookSearcherControllerMockMvcTest {
@Autowired
private MockMvc mockMvc;
@MockBean
private BookSearcherService bookSearcherService;
@Autowired
private ObjectMapper objectMapper;
@Test
public void canListAll() throws Exception {
assertThat(bookSearcherService).isNotNull();
assertThat(mockMvc).isNotNull();
List<BookDto> books = asList(new BookDto("Title 1"), new BookDto("Title 2"), new BookDto("Title 3"));
given(bookSearcherService.listAll()).willReturn(books);
ResultActions perform = mockMvc.perform(get("/book/list"));
}
}
POM.XML
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.search.book</groupId>
<artifactId>book-searcher</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>book-searcher</name>
<description>Project for books search</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.flywaydb</groupId>
<artifactId>flyway-core</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-all</artifactId>
<version>1.9.5</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-launcher</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-runner</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
问题：
我上面提到的问题是 BookSearcherService 在 mockMvc 上执行调用时有 null。这意味着要么 @MockBean 不起作用，要么我犯了几个小时都无法发现的错误。我正在使用 Java8.
问题是 bookSearcherService 没有被注入 BookSearchController 因为它使用 @RequiredArgsConstructor 在这种情况下不会创建正确的构造函数。
@RequiredArgsConstructor 文档声明将使用未初始化的 final 或 @NonNull 字段的参数创建构造函数。但是，bookSearcherService 两者都不是，因此它不会作为构造函数参数添加。
因此，虽然 mock 本身不为 null，但它从未注入到被测试的控制器中。
我在 Whosebug 上研究了类似的问题，但在我的案例中找不到根本原因。
上下文：
我在 SpringBoot 2 中有 @RestController，依赖于 BookSearcherService。我想模拟 BookSearcherService 以便对控制器进行单元测试。
错误：
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1013) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897) at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) at org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:71) at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) at org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:166) at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133) at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133) at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133) at org.springframework.test.web.servlet.MockMvc.perform(MockMvc.java:182) at com.search.book.Booksearcher.controller.BookSearcherControllerMockMvcTest.canListAll(BookSearcherControllerMockMvcTest.java:54) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:532) at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod(TestMethodTestDescriptor.java:171) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:167) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:114) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:59) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:108) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:98) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:74) at java.util.ArrayList.forEach(ArrayList.java:1257) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:112) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:98) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:74) at java.util.ArrayList.forEach(ArrayList.java:1257) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:112) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:98) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:74) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:220) at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute(DefaultLauncher.java:188) at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:202) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:181) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128) at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:89) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209) Caused by: java.lang.NullPointerException at com.search.book.Booksearcher.controller.BookSearcherController.listAll(BookSearcherController.java:31) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:189) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) ... 59 more
代码：
BookSearcherController.java:
@RestController
@RequestMapping("/book")
@RequiredArgsConstructor
public class BookSearcherController {
private BookSearcherService bookSearcherService;
@GetMapping(path = "/list", produces = { "application/json" })
@ResponseBody
public List<BookDto> listAll() {
return bookSearcherService.listAll();
}
}
BookSearcherService.java:
@Service
public class BookSearcherService {
private BookSearcherCrudService bookSearcherCrudService;
@Autowired
void setBookSearcherRepository(BookSearcherCrudService bookSearcherCrudService) {
this.bookSearcherCrudService = bookSearcherCrudService;
}
private BookSearcherRepository bookSearcherRepository;
@Autowired
void setBookSearcherRepository(BookSearcherRepository bookSearcherRepository) {
this.bookSearcherRepository = bookSearcherRepository;
}
public List<BookDto> listAll() {
List<Book> books = bookSearcherRepository.findAll();
return books.stream()
.map(bookSearcherCrudService::toDto)
.collect(Collectors.toList());
}
}
BookSearcherControllerMockMvcTest.java:
@WebMvcTest(controllers = BookSearcherController.class)
public class BookSearcherControllerMockMvcTest {
@Autowired
private MockMvc mockMvc;
@MockBean
private BookSearcherService bookSearcherService;
@Autowired
private ObjectMapper objectMapper;
@Test
public void canListAll() throws Exception {
assertThat(bookSearcherService).isNotNull();
assertThat(mockMvc).isNotNull();
List<BookDto> books = asList(new BookDto("Title 1"), new BookDto("Title 2"), new BookDto("Title 3"));
given(bookSearcherService.listAll()).willReturn(books);
ResultActions perform = mockMvc.perform(get("/book/list"));
}
}
POM.XML
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.search.book</groupId>
<artifactId>book-searcher</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>book-searcher</name>
<description>Project for books search</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.flywaydb</groupId>
<artifactId>flyway-core</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-all</artifactId>
<version>1.9.5</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-launcher</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-runner</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
问题：
我上面提到的问题是 BookSearcherService 在 mockMvc 上执行调用时有 null。这意味着要么 @MockBean 不起作用，要么我犯了几个小时都无法发现的错误。我正在使用 Java8.
问题是 bookSearcherService 没有被注入 BookSearchController 因为它使用 @RequiredArgsConstructor 在这种情况下不会创建正确的构造函数。
@RequiredArgsConstructor 文档声明将使用未初始化的 final 或 @NonNull 字段的参数创建构造函数。但是，bookSearcherService 两者都不是，因此它不会作为构造函数参数添加。
因此，虽然 mock 本身不为 null，但它从未注入到被测试的控制器中。