I have a test class as
import org.scalatest.FlatSpec
import scala.collection.mutable
class Tags101Spec extends FlatSpec {
  "A Stack" should "pop values in last-in-first-out order" in {
    val stack = new mutable.Stack[Int]
    stack.push(1)
    stack.push(2)
    assert(stack.pop() === 2)
    assert(stack.pop() === 1)
  }
  it should "throw NoSuchElementException if an empty stack is popped" in 

 
    
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