Example of simple JUnit4 tests in Scala, including exception checking via @test(expected).

ExampleTestSuite.scala

import org.junit.Assert._
import org.junit.Test

class ExampleTestSuite {

  @Test
  def ok() {
    assertTrue(true)
  }

  @Test(expected = classOf[IllegalArgumentException])
  def badRequire() {
    require(false) // fails with an IllegalArgumentException
  }

  @Test(expected = classOf[AssertionError])
  def badEnsuring() {
    true ensuring (!_) // fails with an AssertionError
  }
  
}