ScalaTest example

ScalaTest installation

http://www.scalatest.org/install




Lets modify this example (see code below):

http://www.scalatest.org/quick_start


> sbt test


sbt.build

/**  * Created by depappas on 7/10/17.  */import org.scalatest._

import scala.collection.mutable.ArrayBuffer

class ExampleSpec extends FlatSpec with Matchers {

  class Stack[T] {
    val stack = new ArrayBuffer[T]
    def push(d: T) : Unit = {
      stack += d
    }
    def pop() : T = {
      stack.last
      stack.remove(stack.length - 1)
    }
  }
  "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
    a [NoSuchElementException] should be thrownBy {
      emptyStack.pop()
    }
  }
}