基于mybatis的单元测试失败

1：单元测试启动不了 老是报下面错误。

2：报错代码如下：2023-09-19 17:54:42.641 ERROR 15004 --- [ main] o.s.test.context.TestContextManager : Caught exception while allowing TestExecutionListener [org.springframework.boot.test.autoconfigure.SpringBootDependencyInjectionTestExecutionListener@5f9678e1] to prepare test instance [com.ygm.mybatis.MybatisApplicationTests@7f13811b]

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'com.ygm.mybatis.MybatisApplicationTests': Unsatisfied dependency expressed through field 'um'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.ygm.mybatis.mapper.deleteMapper' 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$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1422) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireBeanProperties(AbstractAutowireCapableBeanFactory.java:393) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:119) ~[spring-test-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83) ~[spring-test-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.boot.test.autoconfigure.SpringBootDependencyInjectionTestExecutionListener.prepareTestInstance(SpringBootDependencyInjectionTestExecutionListener.java:43) ~[spring-boot-test-autoconfigure-2.3.0.RELEASE.jar:2.3.0.RELEASE]
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:244) ~[spring-test-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:98) ~[spring-test-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$5(ClassBasedTestDescriptor.java:341) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.executeAndMaskThrowable(ClassBasedTestDescriptor.java:346) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$6(ClassBasedTestDescriptor.java:341) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[na:na]
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) ~[na:na]
at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na]
at java.base/java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:312) ~[na:na]
at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:735) ~[na:na]
at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:734) ~[na:na]
at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:658) ~[na:na]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeTestInstancePostProcessors(ClassBasedTestDescriptor.java:340) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.instantiateAndPostProcessTestInstance(ClassBasedTestDescriptor.java:263) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$2(ClassBasedTestDescriptor.java:256) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at java.base/java.util.Optional.orElseGet(Optional.java:369) ~[na:na]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$3(ClassBasedTestDescriptor.java:255) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.execution.TestInstancesProvider.getTestInstances(TestInstancesProvider.java:29) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$prepare$0(TestMethodTestDescriptor.java:108) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:107) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:71) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$prepare$1(NodeTestTask.java:107) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.prepare(NodeTestTask.java:107) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:75) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at java.base/java.util.ArrayList.forEach(ArrayList.java:1540) ~[na:na]
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at java.base/java.util.ArrayList.forEach(ArrayList.java:1540) ~[na:na]
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:248) ~[junit-platform-launcher-1.6.2.jar:1.6.2]
at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$5(DefaultLauncher.java:211) ~[junit-platform-launcher-1.6.2.jar:1.6.2]
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:226) ~[junit-platform-launcher-1.6.2.jar:1.6.2]
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:199) ~[junit-platform-launcher-1.6.2.jar:1.6.2]
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:132) ~[junit-platform-launcher-1.6.2.jar:1.6.2]
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69) ~[junit5-rt.jar:na]
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33) ~[junit-rt.jar:na]
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230) ~[junit-rt.jar:na]
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58) ~[junit-rt.jar:na]
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.ygm.mybatis.mapper.deleteMapper' 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:1716) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1272) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1226) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]
... 67 common frames omitted

2023-09-19 17:54:42.671 INFO 15004 --- [extShutdownHook] com.alibaba.druid.pool.DruidDataSource : {dataSource-1} closing ...
2023-09-19 17:54:42.671 INFO 15004 --- [extShutdownHook] com.alibaba.druid.pool.DruidDataSource : {dataSource-1} closed
2023-09-19 17:54:42.671 INFO 15004 --- [extShutdownHook] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'

3：
测试代码

4：操作数据库的Mapper代码

这个错误是由于在Spring Boot测试中，无法找到类型为com.ygm.mybatis.mapper.deleteMapper的bean。要解决这个问题，需要确保deleteMapper接口上有@Mapper注解，并且在配置类上使用@MapperScan注解指定扫描的包路径。

首先，确保deleteMapper接口上有@Mapper注解：

import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface DeleteMapper {
    // ...
}

然后，在配置类上使用@MapperScan注解指定扫描的包路径：

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@MapperScan("com.ygm.mybatis.mapper")
public class MyBatisConfig {
    // ...
}

这样，Spring Boot测试就能正确识别deleteMapper接口，并创建对应的bean实例。

【以下回答由 GPT 生成】

可能的原因是测试类中的依赖注入的字段类型与配置文件中的bean类型不匹配，导致启动失败。

解决办法： 1. 确保测试类上使用了@RunWith(SpringRunner.class)注解，以及@SpringBootTest注解。 2. 检查@Autowired注解的字段类型，确保它与配置文件中的bean类型匹配。 3. 检查对应的Mapper接口是否已经添加了@Mapper注解，以便MyBatis能够扫描到该接口并生成对应的实现类。 4. 确保在测试类中使用了正确的包名，以便能够扫描到Mapper接口和对应的实现类。 5. 如果是使用@MapperScan注解进行扫描的方式，检查该注解的使用位置和参数配置，确保可以扫描到Mapper接口。

如果以上方法都不能解决问题，可能是其他配置或依赖引起的，建议检查相关配置和依赖是否正确。如果问题还存在，可能需要进一步调查和分析具体的环境和代码。

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