How to configure IntelliJ for running test with JUnit 4?

Question

Should be simple but I couldn't figure it out.

When running my unit test inside IntelliJ, I could not find a way to tell IntelliJ-9.0 that it should use JUnit4 instead of JUnit3.

When a test fails, IntelliJ console displays:

MyTests.testConstraints(MyTests.groovy:20) at

...

com.intellij.junit3.JUnit3IdeaTestRunner.doRun(JUnit3IdeaTestRunner.java:108) at com.intellij.junit3.JUnit3IdeaTestRunner.startRunnerWithArgs(JUnit3IdeaTestRunner.java:42) ...

Do you know how to replace JUnit3 by JUnit4 ?

Answer 1

Put the JUnit 4 JAR in your CLASSPATH and see if IntelliJ picks it up.

The JUnit plug-in appears to run either version 3 or 4.

I'll bet that it has to do with the way you're writing your JUnit tests. Post one to confirm. If you use the JUnit 4 style, I'll bet IntelliJ would run it properly.

Answer 2

I found it!

1. Go to Run/Debug Configurations
2. Add new configuration and choose a JUnit
3. In the configuration tab, add "-junit4" to the Test run parameters input field

And that's done !

Answer 3

'com.intellij.junit3' package belongs to IDEA binaries, not to junit3 or junit4. So, the question itself seems to be incorrect in essence - there is no difference in what package name is used by IDEA codebase internally if it correctly executes the tests.

Answer 4

It sounds like the real problem may be that you are trying to use junit 4 with a grails version less than 1.3. Grails 1.2.x and lower only support Junit 3 tests. Grails 1.3 will finally have junit 4 support. This was discussed on stackoverflow link text

Answer 5

You can annotate your test class with an annotation to indicate junit the runner it will use

@RunWith(JUnit4.class) MyTestClass {}