public void Should_Return_10_For_X()
{
var expression = "X";
var calculator = new RomanCalculator(expression);
Assert.AreEqual(10, calculator.Result());
}
public void Should_Return_3_For_III()
{
var expression = "III";
var calculator = new RomanCalculator(expression);
Assert.AreEqual(3, calculator.Result());
}
public void Should_Return_5_For_V()
{
var expression = "V";
var calculator = new RomanCalculator(expression);
Assert.AreEqual(5, calculator.Result());
}
public void Should_Subtract_Two_Roman_Numbers()
{
var expression = "I - II";
var calculator = new RomanCalculator(expression);
Assert.AreEqual(-1, calculator.Result());
}
public void Should_Add_Two_Roman_Numbers()
{
var expression = "I + II";
var calculator = new RomanCalculator(expression);
Assert.AreEqual(3, calculator.Result());
}
public void Should_Divide_Three_Roman_Numbers()
{
var expression = "I / II / III";
var calculator = new RomanCalculator(expression);
Assert.AreEqual(0.166, calculator.Result());
}
public void Should_Multiply_Three_Roman_Numbers()
{
var expression = "I * II * III";
var calculator = new RomanCalculator(expression);
Assert.AreEqual(6, calculator.Result());
}
public void Should_Process_Parenthesis_Before_Anything_Else()
{
var parensFirstInExpression = "( I + II ) * III";
var calculator = new RomanCalculator(parensFirstInExpression);
Assert.AreEqual(9, calculator.Result());
var parensLastInExpression = "I * ( II + III )";
calculator = new RomanCalculator(parensLastInExpression);
Assert.AreEqual(5, calculator.Result());
}
public void Should_Perform_Multiplication_Before_Addition()
{
var multiplicationIsSecondInExpression = "I + II * III";
var calculator = new RomanCalculator(multiplicationIsSecondInExpression);
Assert.AreEqual(7, calculator.Result());
var multiplicationIsFirstInExpression = "I * II + III";
calculator = new RomanCalculator(multiplicationIsFirstInExpression);
Assert.AreEqual(5, calculator.Result());
}
