JUnit - 除@Test 注释外，每个注释都有效

Question

I've cloned the sample project which JetBrains uses for demonstration purposes ( https://github.com/JetBrains/intellij-samples.git ) from GitHub since I had an issue with JUnit and wanted to see whether those issues persist when using an official project (to make sure that I haven't messed something up). Unfortunately the issue persists and after hours of research on Google, StackOverflow or last but not least the JetBrains Support Board I can't manage to get this issue resolved.

I can't get JUnit to work with the sample project as well as my own projects. Whenever I add JUnit to my classpath (using Maven), it imports all the required libraries. After that, literally everything works perfectly fine except for the @Test annotation. I can use other annotations like org.junit.jupiter.api.Disabled (@Disabled) or org.junit.jupiter.api.ParameterizedTest (@ParameterizedTest) but whenever I try to use the org.junit.jupiter.api.Test (@Test) annotation I get a "Cannot resolve symbol 'Test'" error.

When hovering above the @Test annotation it suggests to add JUnit4 or JUnit5 to the classpath. If I select that option I still get the same error and when hovering above the @Test annotation afterwards it still suggests the same thing. I've already tried to do "Maven > Reload Project", "File > Invalidate Caches / Restart", reinstalling IntelliJ Ultimate and importing the JUnit API manually by adding it as an external Java library to the project without using Maven or Gradle. I also made sure that the directory in which I am trying to use the @Test annotation in is a "Test Source Folder". However, once again, all the other JUnit annotations work perfectly fine. Only @Test is not working and throws a "Cannot resolve symbol 'Test'" error.

I am using the following versions:

• IntelliJ: 2020.3.2 (Ultimate Edition) [latest]
• Java: 1.8 "1.8.0_144"
• JUnit: 5.7.1 (But I've also tried to use plenty of other versions [from 4.0 to 5.8] instead without success.)
• OS: Windows 10 Home 64 bit

I've tried setting up JUnit with Eclipse using Maven and it immediately worked so I am not sure whether this has something to do with IntelliJ specifically. At this point I start to run out of ideas as to why everything except the @Test annotation is working perfectly fine. I've already tried plenty of suggestions from aforementioned sites, hence I really hope that we can get this issue resolved here.

I've appended a screenshot of one of the classes where this issue occurs. All of the code as well as the pom.xml file / etc is the same as in https://github.com/JetBrains/intellij-samples . I haven't modified any of the files locally and only tried "Maven > Reload Project" as well as "File > Invalidate Caches / Restart" with the sample project. If you need any further info in order to have a look at this issue make sure to let me know.

Thanks in advance.

Max

Attachments:

• Screenshot of test/com.jetbrains.code.JavaAt25Test

Answer 1

Please see if deleting the system directory helps while the IDE is not running. It looks like file system cache related issue. Should be fixed in 2021.1 release.

The issue is not reproducible in 2020.3.2 with the clean system directory: