Why does Intellij IDEA suddenly not recognize test

问题:

I'm using JUnit since I started this project and everything works just fine. I have a couple of hundreds tests, and of course, here and there I start them all. Right click on root test folder, run (or debug) with JUnit. But since yesterday, when I do that, the result is:

Process finished with exit code 0

without starting any of tests. Same thing is with any folder in folder tree. I can still run a single test class, but I really need an option to start them all. If any of you have any ideas, please drop them here.

Here is what is logged when I try to run tests:

2012-10-31 15:16:55,693 [2727217]  ERROR - ij.psi.impl.source.PsiFileImpl - IntelliJ IDEA 11.1.2  Build #IU-117.418 
2012-10-31 15:16:55,693 [2727217]  ERROR - ij.psi.impl.source.PsiFileImpl - JDK: 1.6.0_31 
2012-10-31 15:16:55,693 [2727217]  ERROR - ij.psi.impl.source.PsiFileImpl - VM: Java HotSpot(TM) Client VM 
2012-10-31 15:16:55,693 [2727217]  ERROR - ij.psi.impl.source.PsiFileImpl - Vendor: Sun Microsystems Inc. 
2012-10-31 15:16:55,693 [2727217]  ERROR - ij.psi.impl.source.PsiFileImpl - OS: Windows 7 
2012-10-31 15:16:55,693 [2727217]  ERROR - ij.psi.impl.source.PsiFileImpl - Last Action: RunClass 
2012-10-31 15:16:55,693 [2727217]  ERROR - m.intellij.util.ExecutorsQuery - com.intellij.psi.tree.IFileElementType cannot be cast to com.intellij.psi.tree.IStubFileElementType 
java.lang.ClassCastException: com.intellij.psi.tree.IFileElementType cannot be cast to com.intellij.psi.tree.IStubFileElementType
    at com.intellij.psi.impl.source.PsiFileImpl.calcStubTree(PsiFileImpl.java:976)
    at com.intellij.psi.stubs.StubIndexImpl$1.perform(StubIndexImpl.java:239)
    at com.intellij.psi.stubs.StubIndexImpl$1.perform(StubIndexImpl.java:220)
    at com.intellij.util.indexing.ValueContainer.forEach(ValueContainer.java:60)
    at com.intellij.psi.stubs.StubIndexImpl.process(StubIndexImpl.java:220)
    at com.intellij.psi.stubs.StubIndexImpl.get(StubIndexImpl.java:194)
    at com.intellij.psi.stubs.AbstractStubIndex.get(AbstractStubIndex.java:33)
    at com.intellij.psi.impl.java.stubs.index.JavaAnnotationIndex.get(JavaAnnotationIndex.java:47)
    at com.intellij.psi.impl.search.AnnotatedElementsSearcher.a(AnnotatedElementsSearcher.java:93)
    at com.intellij.psi.impl.search.AnnotatedElementsSearcher.execute(AnnotatedElementsSearcher.java:44)
    at com.intellij.psi.impl.search.AnnotatedElementsSearcher.execute(AnnotatedElementsSearcher.java:28)
    at com.intellij.util.ExecutorsQuery.processResults(ExecutorsQuery.java:42)
    at com.intellij.util.AbstractQuery.forEach(AbstractQuery.java:67)
    at com.intellij.util.InstanceofQuery.forEach(InstanceofQuery.java:54)
    at com.intellij.execution.ConfigurationUtil.addAnnotatedMethodsAnSubclasses(ConfigurationUtil.java:97)
    at com.intellij.execution.ConfigurationUtil.findAllTestClasses(ConfigurationUtil.java:77)
    at com.intellij.execution.junit.TestPackage$MySearchForTestsTask.run(TestPackage.java:397)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl$TaskRunnable.run(ProgressManagerImpl.java:469)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl$2.run(ProgressManagerImpl.java:178)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:218)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcess(ProgressManagerImpl.java:169)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl$8.run(ProgressManagerImpl.java:378)
    at com.intellij.openapi.application.impl.ApplicationImpl$6.run(ApplicationImpl.java:434)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
    at com.intellij.openapi.application.impl.ApplicationImpl$1$1.run(ApplicationImpl.java:145)

回答1:

OK, I fixed it.

In menu, under File, there is an invalidate cache option. That fixed it!

回答2:

On the latest IDE (as of Community Edition 2016.1) this option is more simplified.

right click on the folder you want to be recognized as a source folder:

Mark Directory As -> Sources Root

回答3:

Just to add a different scenario, which happened to me and some of my coworkers:

Alt+enter in the class -> create test: IJ (2017.1.1) proposes Arquillian Junit as first option of testing library and by going with it the test class and methods are created without the 'public' identifier. Then if one decides to change the testing library to JUnit, it is easy to forget about the absence of the 'public' identifier, which causes the tests not to be recognised by IJ. Of course, the solution is to place the 'public' identifiers.

Although this is not what happened to you it has the same consequence, therefore this answer may help others experiencing the same symptoms.

回答4:

Fixed this a few times by... open file --> project structure. There, look on the left side menu as last entry there is "problem" count(if more then zero). click on those and then for for each problem highlighted in red in intellij in modules/libraries, remove them (minus button). They will be given module names like "test1..23" since intellij cant make out the structure. After deleting all marked red, close + restart intellij. Dont run maven refresh at this stage, since it will reintroduce the same error again. By restarting intellij will trigger a new scan of the project structure again.

回答5:

In my case I had to:

• close the project
• open the build.gradle file
• overwrite existing project? Yes
• right click on project
  • Mark directory as > Resources Root

回答6:

If you are using IntelliJ for test execution and debugging, but not for editing. Your other editor/IDE may be battling with IntelliJ for control over generated files (*.class) -- resulting in IntelliJ reporting that No tests were found (and maybe spurious build errors too).

In my case, Visual Studio Code seem to be having this effect (after recent updates to both tools).

The solution that I have found is to close Visual Studio Code and then clean rebuild the project with IntelliJ or from the command-line. In otherwords, my dual-IDE workflow no longer works -- so I have to edit in IntelliJ.