public void Swap_SwapValues_ValuesSwaped()
{
var calc = new StackCalculator();
calc.Push(100);
calc.Push(200);
calc.Swap();
Expect(calc.Pop(), Is.EqualTo(100));
}
public void Swap_InvalidOperation_ThrowsException()
{
var calc = new StackCalculator();
//calc.Push(10);
Exception e = Assert.Throws<InvalidOperationException>(() => calc.Swap());
}