Springboot单元测试采坑二：java.lang.Exception: No runnable methods错误

客官°小女子只卖身不卖艺 2023-07-06 14:35 100阅读 0赞

## 1. 现象 ##

JUnit单元测试时报错：Java.lang.Exception: No runnable methods  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hvdXBlaWJpbjIwMTI_size_16_color_FFFFFF_t_70]  
错误代码：

java.lang.Exception: No runnable methods
    
    	at org.junit.runners.BlockJUnit4ClassRunner.validateInstanceMethods(BlockJUnit4ClassRunner.java:191)
    	at org.junit.runners.BlockJUnit4ClassRunner.collectInitializationErrors(BlockJUnit4ClassRunner.java:128)
    	at org.junit.runners.ParentRunner.validate(ParentRunner.java:416)
    	at org.junit.runners.ParentRunner.<init>(ParentRunner.java:84)
    	at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:65)
    	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.<init>(SpringJUnit4ClassRunner.java:137)
    	at org.springframework.test.context.junit4.SpringRunner.<init>(SpringRunner.java:49)
    	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    	at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
    	at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:104)
    	at org.junit.vintage.engine.discovery.DefensiveAllDefaultPossibilitiesBuilder$DefensiveAnnotatedBuilder.buildRunner(DefensiveAllDefaultPossibilitiesBuilder.java:113)
    	at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:86)
    	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
    	at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
    	at org.junit.vintage.engine.discovery.DefensiveAllDefaultPossibilitiesBuilder.runnerForClass(DefensiveAllDefaultPossibilitiesBuilder.java:56)
    	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
    	at org.junit.vintage.engine.discovery.ClassSelectorResolver.resolveTestClass(ClassSelectorResolver.java:66)
    	at org.junit.vintage.engine.discovery.ClassSelectorResolver.resolve(ClassSelectorResolver.java:47)
    	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.lambda$resolve$2(EngineDiscoveryRequestResolution.java:129)
    	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution$$Lambda$44/2047526627.apply(Unknown Source)
    	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
    	at java.util.ArrayList$ArrayListSpliterator.tryAdvance(ArrayList.java:1351)
    	at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126)
    	at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:529)
    	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:516)
    	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)
    	at java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:152)
    	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    	at java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:464)
    	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:174)
    	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:120)
    	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.access$100(EngineDiscoveryRequestResolution.java:53)
    	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution$DefaultContext.resolve(EngineDiscoveryRequestResolution.java:227)
    	at org.junit.vintage.engine.discovery.MethodSelectorResolver.resolveParentAndAddFilter(MethodSelectorResolver.java:56)
    	at org.junit.vintage.engine.discovery.MethodSelectorResolver.resolve(MethodSelectorResolver.java:40)
    	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.lambda$resolve$2(EngineDiscoveryRequestResolution.java:138)
    	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution$$Lambda$44/2047526627.apply(Unknown Source)
    	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
    	at java.util.ArrayList$ArrayListSpliterator.tryAdvance(ArrayList.java:1351)
    	at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126)
    	at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:529)
    	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:516)
    	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)
    	at java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:152)
    	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    	at java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:464)
    	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:174)
    	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:120)
    	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolveCompletely(EngineDiscoveryRequestResolution.java:87)
    	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.run(EngineDiscoveryRequestResolution.java:80)
    	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolver.resolve(EngineDiscoveryRequestResolver.java:112)
    	at org.junit.vintage.engine.discovery.VintageDiscoverer.discover(VintageDiscoverer.java:42)
    	at org.junit.vintage.engine.VintageTestEngine.discover(VintageTestEngine.java:62)
    	at org.junit.platform.launcher.core.DefaultLauncher.discoverEngineRoot(DefaultLauncher.java:177)
    	at org.junit.platform.launcher.core.DefaultLauncher.discoverRoot(DefaultLauncher.java:164)
    	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)
    	at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69)
    	at com.intellij.rt.execution.junit.IdeaTestRunner$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)

## 2、测试源码 ##

package com.test;
    
    import junit.framework.TestCase;
    import lombok.extern.slf4j.Slf4j;
    import org.junit.jupiter.api.Test;
    import org.junit.runner.RunWith;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    @Slf4j
    public class MyTests { 
        /** * 使用断言 */
        @Test
        public void test2() { 
            log.info("test hello 2");
            TestCase.assertEquals(1, 1);
        }
    }

## 3、原因 ##

@Test 注解引入的包错了，spring-test需要的Junit是org.junit.Test，但是在@Test有两个包，另一个是org.junit.jupiter.api.Test，如果将org.junit.Test导错成了org.junit.jupiter.api.Test就会报这个错误，改正包之后问题解决。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hvdXBlaWJpbjIwMTI_size_16_color_FFFFFF_t_70 1]  
改正后代码：

package com.test;
    
    import junit.framework.TestCase;
    import lombok.extern.slf4j.Slf4j;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    @Slf4j
    public class MyTests { 
        /** * 使用断言 */
        @Test
        public void test2() { 
            log.info("test hello 2");
            TestCase.assertEquals(1, 1);
        }
    }

附带pom对测试jar的引用：

<dependency>
    	<groupId>org.springframework.boot</groupId>
    	<artifactId>spring-boot-starter-test</artifactId>
    	<scope>test</scope>
    </dependency>

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hvdXBlaWJpbjIwMTI_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200219200232422.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hvdXBlaWJpbjIwMTI=,size_16,color_FFFFFF,t_70