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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) 
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Add a new testIn your production code in the editor, place the caret at the class for which you want to create a test, press Alt+Enter , and select Create Test. In the Create Test dialog, select the library that you want to use. If you don't have the necessary library yet, you will be prompted to download it.
Check in Project settings -> Modules that you test package is marked as Tests. Right click on the test class name either in the code window or in the project panel, and select Run <classname>. If you don't see the run menu in the popup then you haven't selected a test or you don't have junit plugin installed.
OK, I fixed it.
In menu, under File, there is an invalidate cache option. That fixed it!
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