junit单元测试，以及使用的时候报错解决方法 org.junit.runners.model.InvalidTestClassError: Invalid test class ‘......

骑猪看日落 2021-09-07 06:02 1130阅读 0赞

需要添加以下注解

@RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration(locations={"classpath:xmls/spring-context.xml"})
    public class MapperTest {

maven仓库地址

<dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
                <scope>test</scope>
            </dependency>
    
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>4.3.7.RELEASE</version>
            </dependency>

### 测试的时候报错 ： org.junit.runners.model.InvalidTestClassError: Invalid test class 'cn.util.CSDN':， 一般有两个错误引起的 ###

**错误代码如下**

org.junit.runners.model.InvalidTestClassError: Invalid test class 'cn.util.CSDN1':
      1. Method Test2() should be void
    
    	at org.junit.runners.ParentRunner.validate(ParentRunner.java:525)
    	at org.junit.runners.ParentRunner.<init>(ParentRunner.java:102)
    	at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:84)
    	at org.junit.runners.JUnit4.<init>(JUnit4.java:23)
    	at org.junit.internal.builders.JUnit4Builder.runnerForClass(JUnit4Builder.java:10)
    	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:70)
    	at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:37)
    	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:70)
    	at org.junit.internal.requests.ClassRequest.createRunner(ClassRequest.java:28)
    	at org.junit.internal.requests.MemoizingRequest.getRunner(MemoizingRequest.java:19)
    	at org.junit.internal.requests.FilterRequest.getRunner(FilterRequest.java:36)
    	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:49)
    	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)

### 解决方法 ###

**1、 有时候IDEA开启了自动导包, 导致@Test注解导包时会导错包。  正确的包地址：   import org.junit.Test;**

**2、方法类型错误**

**使用注意事项， **

//单元测试
        // 1、添加  @Test注解   包路径是 import org.junit.Test;注意不要导错包，
        // 2、方法类型必须是 void，没有返回值
        // 3、注意一个坑，和本Test单元测试同类中的其他测试方法也不能添加带返回值的方法，方法类型也必须是void
        @Test
        public void Test(){
            System.out.println( " ============= ");
            System.out.println( " ============= ");
            System.out.println( " ============= ");
        }

**如下图，如果 Test2 方法带返回值，那么Test1 方法执行的时候也会报错，错误类型如下**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTYxMjI2_size_16_color_FFFFFF_t_70][]

**如果方法都改成void类型，就没有错误了**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTYxMjI2_size_16_color_FFFFFF_t_70 1][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTYxMjI2_size_16_color_FFFFFF_t_70]: /images/20210827/9bcfe2516ed44c23a179902598eba213.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTYxMjI2_size_16_color_FFFFFF_t_70 1]: /images/20210827/238cdb0bc8894a6aa142e0c5e3ff41f0.png