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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()
}
}
}
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