public void OperatorPlus_SameDenominator_ReturnsValidResult()
{
var a = new Fraction(3, 5);
var b = new Fraction(1, 5);
var actual = a + b;
actual.Numerator.ShouldBeEquivalentTo(4);
actual.Denominator.ShouldBeEquivalentTo(5);
}
public void OperatorPlus_DifferentDenominator_ReturnsValidResult(int aNum, int aDenom, int bNum, int bDenom, int expectedNum, int expectedDenom)
{
var a = new Fraction(aNum, aDenom);
var b = new Fraction(bNum, bDenom);
var expected = new Fraction(expectedNum, expectedDenom);
var actual = a + b;
actual.ShouldBeEquivalentTo(expected);
}
public static Fraction operator -(Fraction a, Fraction b)
{
var bChangedSign = new Fraction(-1 * b.Sign * b.Numerator, b.Denominator);
return a + bChangedSign;
}
