IDEA 报错：no tests were found 和 UnsupportedOperationException

这里分享一个 IntelliJ IDEA 运行 @Test 测试方法失败的问题以及解决方法。

测试类如下：

public class DaoTest {
@Testpublic void register() {String date = new SimpleDateFormat("yyyy-MM-dd").format(new Date());User user = new User("renda", "123456", "123456789456", date);System.out.println("注册成功");}

}

运行报错：

Error:Internal error: (java.lang.UnsupportedOperationException) empty.min
java.lang.UnsupportedOperationException: empty.minat scala.collection.TraversableOnce.min(TraversableOnce.scala:225)at scala.collection.TraversableOnce.min$(TraversableOnce.scala:223)at scala.collection.AbstractTraversable.min(Traversable.scala:108)at org.jetbrains.jps.incremental.scala.ScalaCompilerReferenceIndexBuilder.getTargetTimestamps(ScalaCompilerReferenceIndexBuilder.scala:53)at org.jetbrains.jps.incremental.scala.ScalaCompilerReferenceIndexBuilder.getAllClassesInfo(ScalaCompilerReferenceIndexBuilder.scala:99)at org.jetbrains.jps.incremental.scala.ScalaCompilerReferenceIndexBuilder.buildFinished(ScalaCompilerReferenceIndexBuilder.scala:33)at org.jetbrains.jps.incremental.IncProjectBuilder.runBuild(IncProjectBuilder.java:468)at org.jetbrains.jps.incremental.IncProjectBuilder.build(IncProjectBuilder.java:190)at org.jetbrains.jps.cmdline.BuildRunner.runBuild(BuildRunner.java:138)at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:297)at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:130)at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler.lambda$channelRead0$0(BuildMain.java:218)at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)at java.base/java.lang.Thread.run(Thread.java:834)

执行 maven clean 之后再运行测试方法会报错：

no tests were found

后来发现是项目的 .idea 文件夹和 .iml 文件因为路径不匹配引起的问题，于是删掉 .idea 文件夹和 .iml 文件，重新用 IDEA 打开项目，重新生成 .idea 文件夹和 .iml 文件，测试方法可以正常运行。

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IDEA 报错：no tests were found 和 UnsupportedOperationException

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