ScalaTest Running single test in class produce "Empty test suite."

There is a simple test class

class SimpleTest extends JUnitSuite {

  @Test
  def test() {
    Assert.assertTrue(true)
  }

}

If I run this test as a single test I get "Empty test suite."
but if I run it as Class - all work fine.

IDEA: IU-139.872.1
Scala plugin: 1.2.35.2.EAP

Thanks.