I had lots of difficulties running my tests under IDEA. The exact error message was:

Error running All Tests:
Not found suite class.

Where All Tests was the name of my Run configuration.

I finally ended up with the right incantations. In my POM, I have the following:

 1 <dependencies>
 2     <dependency>
 3       <groupId>junit</groupId>
 4       <artifactId>junit</artifactId>
 5       <version>4.8.1</version>
 6       <scope>test</scope>
 7     </dependency>
 8     <dependency>
 9       <groupId>org.scalatest</groupId>
10       <artifactId>scalatest_2.9.0-1</artifactId>
11       <version>1.6.1</version>
12     </dependency>
13     <dependency>
14       <groupId>org.mockito</groupId>
15       <artifactId>mockito-core</artifactId>
16       <version>1.8.1</version>
17       <scope>test</scope>
18     </dependency>
19 </dependencies>

Then, I had to extend org.scalatest.junit.JUnitSuite for my test classes, like this:

1 import JUnitSuite
2 import org.junit.Test
4 class GivenAnEmptyQueue extends JUnitSuite {
5   @Test def thenItShouldNotHaveAnyElements() {
6     assert(new Queue.empty)
7   }
8 }

Finally, I had to verify that both the JUnit and Scala plugins were enabled and at their latest versions in the IDE itself. After that, I was able to run my tests from within the IDE.


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I am François Beausoleil, a Ruby on Rails and Scala developer. During the day, I work on Seevibes, a platform to measure social interactions related to TV shows. At night, I am interested many things. Read my biography.

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