public void Calculate_factorial_for_current_number()
{
var sut = new RPNCalculator();
Tuple<IEnumerable<int>, int> result = null;
sut.Result += _ => result = _;
sut.Calculate(new Tuple<string, int>("!", 3));
Assert.AreEqual(new int[] {}, result.Item1);
Assert.AreEqual(6, result.Item2);
}
public void Drop_number_from_empty_stack()
{
var initialStack = new Stack<int>();
var sut = new RPNCalculator(initialStack);
Tuple<IEnumerable<int>, int> result = null;
sut.Result += _ => result = _;
sut.Drop();
Assert.AreEqual(new int[] { }, result.Item1);
Assert.AreEqual(0, result.Item2);
}
public void Add_number_to_single_value_stack()
{
var initialStack = new Stack<int>();
initialStack.Push(2);
var sut = new RPNCalculator(initialStack);
Tuple<IEnumerable<int>, int> result = null;
sut.Result += _ => result = _;
sut.Calculate(new Tuple<string, int>("+", 3));
Assert.AreEqual(new int[]{}, result.Item1);
Assert.AreEqual(5, result.Item2);
}
public void More_basic_operations(int leftOperand,
string op,
int number,
int calcResult)
{
var initialStack = new Stack<int>();
initialStack.Push(leftOperand);
var sut = new RPNCalculator(initialStack);
Tuple<IEnumerable<int>, int> result = null;
sut.Result += _ => result = _;
sut.Calculate(new Tuple<string, int>(op, number));
Assert.AreEqual(new int[] { }, result.Item1);
Assert.AreEqual(calcResult, result.Item2);
}
public void Push_on_empty_stack()
{
var sut = new RPNCalculator();
Tuple<IEnumerable<int>, int> result = null;
sut.Result += _ => result = _;
sut.Push(1);
Assert.AreEqual(new[]{1}, result.Item1);
Assert.AreEqual(1, result.Item2);
}
public void Push_number_on_non_empty_stack()
{
var initialStack = new Stack<int>();
initialStack.Push(1);
var sut = new RPNCalculator(initialStack);
Tuple<IEnumerable<int>, int> result = null;
sut.Result += _ => result = _;
sut.Push(2);
Assert.AreEqual(new[] { 1, 2 }, result.Item1);
Assert.AreEqual(2, result.Item2);
}