examples/scalatest-example/src/test/scala/Test.scala


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import collection.mutable.Stack
import org.scalatest._

class Test extends FlatSpec with Matchers {
  "square" should "return double" in {
    Main.square(2) should be (4)
  }

  "A Stack" should "pop values in last-in-first-out order" in {
    val stack = new Stack[Int]
    stack.push(1)
    stack.push(2)
    stack.pop() should be (2)
    stack.pop() should be (1)
  }

  it should "throw NoSuchElementException if an empty stack is popped" in {
    val emptyStack = new Stack[Int]
    a [NoSuchElementException] should be thrownBy {
      emptyStack.pop()
    }
  }
}