Eclipse JUnit runner cannot find ScalaTest methods on double click

I take the Martin Oder Kurser class, and assignments use ScalaTest. It is very annoying that Eclipse cannot find the testing methods by double-clicking or right-clicking "Go to File" in the JUnit runner.

Double-clicking "Method xxx" was not found. Opening a test class. a dialog box appears.

Is there a configuration problem or is it a ScalaTest bug / limitation?

Here is a ScalaTest sample from the class:

package recfun

import org.scalatest.FunSuite

import org.junit.runner.RunWith
import org.scalatest.junit.JUnitRunner

@RunWith(classOf[JUnitRunner])
class CountChangeSuite extends FunSuite {
  import Main.countChange
  test("manual") {
    assert(countChange(4,List(1,2)) === 3)
  }
}