Spring 引导单元测试未检测到自动装配组件的模块

Question

我们已经将基于 Maven 的 Spring 引导项目拆分为两个模块，如下所示：

ProjectRoot
-SharedModel
-Application
--main
---java
----com....(Application.java)
-----com....(ClassToAutowire.java)
--test
----com....(ApplicationTest.java)
-----com....(ClassToAutowireTest.java)

测试 class 如下所示：

@RunWith(SpringRunner.class)
public class ClassToAutowireTest extends BaseTest {

    @Autowired
    private ClassToAutowire classToAutowire;

    @Before
    public void setup() throws IOException {        
    ....
    }

    @Test
    public void someTest() {
        ....
        assertEquals(this.classToAutowire.isSupported(this.message), true);
    }

}

ClassToAutowire 如下所示：

@Component
public class ClassToAutowire {

    private ConfigurationService configurationService;

    @Autowired
    public ClassToAutowire(ConfigurationService configurationService) {
        this.configurationService = configurationService;
    }



    ....

}

Application.java 看起来如下：

@SpringBootApplication
@EnableRetry
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

ApplicationTest.java 如下所示：

@SpringBootTest
@RunWith(SpringRunner.class)
public class ApplicationTests {

    @Test
    @Ignore
    public void contextLoads() {
        // °º¤ø,¸¸,ø¤º°`°º¤ø,¸,ø¤°º¤ø,¸¸,ø¤º°`°º¤ø,¸
    }
}

当我运行这个单元测试时，我们得到以下跟踪：

    2018-06-27 15:02:37.835 ERROR [                                main] context.TestContextManager.prepareTestInstance(TestContextManager.java:234): Caught exception while allowing TestExecutionListener [org.springframework.test.context.support.DependencyInjectionTestExecutionListener@57c03d88] to prepare test instance [com.some.package.structure.ClassToAutowireTest@16aa8654]
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'com.some.package.structure.ClassToAutowireTest': Unsatisfied dependency expressed through field 'classToAutowire'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.some.package.structure.ClassToAutowire' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireBeanProperties(AbstractAutowireCapableBeanFactory.java:386)
    at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:118)
    at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
    at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runReflectiveCall(SpringJUnit4ClassRunner.java:287)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access[=16=]0(ParentRunner.java:58)
    at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:268)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    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: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.some.package.structure.ClassToAutowire' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1493)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1104)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585)
    ... 27 more

看起来这个问题可以通过添加注释来绕过 @SpringBootTest(classes={ClassToAutowire.class}) 在 @RuneWith 注释下方，但随后单元测试似乎将整个 Spring 启动应用程序加载到运行测试。

我的问题是：

1) 为什么需要这个额外的注释来解决这个问题？应该扫描整个Application/main/java/....（基于Application.java），为什么它没有检测到组件？

2) 如何最好地做到这一点，以最小的负载使单元测试更快？

Answer 1

@SpringBootTest 用于集成测试，这意味着集成应用程序的不同层。这就是它加载整个上下文的原因。

如果您只想对控制器进行单元测试，请使用 @WebMvcTest 和 mock 您需要的所有其他层。

有关带有工作示例的所有层的完整单元测试，请参见： Testing in Spring

最后检索日期：2018/27/06

Answer 2

为您的测试提供 @ContextConfiguration(classes = ClassToAutowire.class)，然后您的上下文将提供 class。 @SpringBootTest 注释用于集成测试以加载完整上下文。使用 @ContextConfiguration 注释，您只能加载部分上下文。

Answer 3

我已经解决了这个错误，方法是将我的测试 class 移到 com 包中。测试文件夹的结构如下所示

--/test
--/--/java
--/--/--/com
--/--/--/--/TestClass

我不确定，如果这个结构没问题，但这个可行。

Spring 引导单元测试未检测到自动装配组件的模块

Spring Boot Unit Test a module not detecting an autowired component

java

intellij-idea

spring-boot

spring-boot-test