public void GivenX_ReturnsY(string numerals, int expected)
{
//arrange
var roman = new Roman();
//act
var actual = roman.ToInteger(numerals);
//assert
Assert.That(actual, Is.EqualTo(expected));
}
public void GivenIV_Returns4()
{
//arrange
var roman = new Roman();
//act
var actual = roman.ToInteger("IV");
//assert
Assert.That(actual, Is.EqualTo(4));
}
public void GivenEmptyString_Returns0()
{
//arrange
var roman = new Roman();
//act
var actual = roman.ToInteger("");
//assert
Assert.That(actual, Is.EqualTo(0));
}
public void GivenInvalidCombination_Throws()
{
//arrange
var roman = new Roman();
//act
//assert
Assert.That(() => roman.ToInteger("IIII"), Throws.TypeOf <ArgumentOutOfRangeException>()
.With.Property(nameof(ArgumentOutOfRangeException.ParamName))
.EqualTo("romanNumerals"));
}