import org.scalatest.junit.JUnit3Suite
 import scala.collection.mutable.ListBuffer

 class TwoSuite extends JUnit3Suite {

   var sb: StringBuilder = _
   var lb: ListBuffer[String] = _

   override def setUp() {
     sb = new StringBuilder("ScalaTest is ")
     lb = new ListBuffer[String]
   }

   def testEasy() {
     sb.append("easy!")
     assert(sb.toString === "ScalaTest is easy!")
     assert(lb.isEmpty)
     lb += "sweet"
   }

   def testFun() {
     sb.append("fun!")
     assert(sb.toString === "ScalaTest is fun!")
     assert(lb.isEmpty)
   }
 }
 

To execute JUnit3Suites with ScalaTest's Runner, you must include JUnit3's jar file on the class path or runpath. This version of JUnit3Suite was tested with JUnit version 3.8.1.