java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing这样的错误，上网查了一下，一般的解决方案是，换一个低一点的版本就好了。还有人说，是缺少hamcrest的包。去官网又看了一下，结果发现这样一段话：
- junit.jar: Includes the Hamcrest classes. The simple all-in-one solution to get started quickly.Starting with version 4.11, Hamcrest is no longer included in this jar.
- junit-dep.jar: Only includes the JUnit classes but not Hamcrest. Lets you use a different Hamcrest version.
注意黑色加下划线的部分。说明4.1.1中没有hamcrest包了.
maven项目中解决方法 ，完整pom：
<!--单元测试工具 start--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <scope>test</scope> </dependency> <!-- https://mvnrepository.com/artifact/org.hamcrest/hamcrest-all --> <dependency> <groupId>org.hamcrest</groupId> <artifactId>hamcrest-all</artifactId> <version>1.3</version> <scope>test</scope> </dependency> <!--单元测试工具 end-->
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