springboot不执行单元测试原因分析

之前写单元测试一般都是选中方法后点击执行，今天使用mvn test执行的时候却一直不执行，其中遇到了两大坑，记录一下。项目是springboot项目.
先说运行了mvn test不执行的问题：现象是控制台输出了下面的信息后就不再输出了

[INFO] Scanning for projects...
Downloading: http://repo.maven.apache.org/maven2/com/fasterxml/jackson/jackson-bom/2.8.10/jackson-bom-2.8.10.pom
Downloading: http://repo.maven.apache.org/maven2/org/apache/logging/log4j/log4j-bom/2.7/log4j-bom-2.7.pom
Downloading: http://repo.maven.apache.org/maven2/org/springframework/spring-framework-bom/4.3.13.RELEASE/spring-framework-bom-4.3.13.RELEASE.pom
Downloading: http://repo.maven.apache.org/maven2/org/springframework/data/spring-data-releasetrain/Ingalls-SR9/spring-data-releasetrain-Ingalls-SR9.pom
Downloading: http://repo.maven.apache.org/maven2/org/springframework/integration/spring-integration-bom/4.3.12.RELEASE/spring-integration-bom-4.3.12.RELEASE.pom
Downloading: http://repo.maven.apache.org/maven2/org/springframework/security/spring-security-bom/4.2.3.RELEASE/spring-security-bom-4.2.3.RELEASE.pom

猜测是http://repo.maven.apache.org...，在网上查了下，说是需要在maven的setting文件里加镜像，参考的是这篇blog：setting里配置镜像
加的配置如下：

   
        
             repo
             central
             Human Readable Name for this Mirror.
             https://repo.maven.apache.org/maven2/
         
  

加好镜像再次执行的时候，所依赖的Jar包都可以顺利的下载下来了。
但是单元测试执行的结果都是0:

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running TestSuite
Tests run: 0, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.914 sec

Results :

Tests run: 0, Failures: 0, Errors: 0, Skipped: 0

将maven-surefire-plugin这个插件从2.6升级到2.19.1版本后，单元测试就可以正常执行了

　　　　　　
                org.apache.maven.plugins
                maven-surefire-plugin
                2.19.1
                
                
                
                    false