public void CalculateAbs()
{
Assert.AreEqual(0, Numbers.Abs(0));
Assert.AreEqual(1, Numbers.Abs(1));
Assert.AreEqual(2, Numbers.Abs(-2));
Assert.AreEqual(1.23, Numbers.Abs(1.23));
Assert.AreEqual(2.34, Numbers.Abs(-2.34));
}