public void AbsTest()
{
//check Abs(int a)
Assert.AreEqual(10, OwnMath.Abs(10));
Assert.AreEqual(10, OwnMath.Abs(-10));
Assert.AreEqual(0, OwnMath.Abs(0));
//check Abs(double a)
Assert.AreEqual(10.5, OwnMath.Abs(10.5));
Assert.AreEqual(10.5, OwnMath.Abs(-10.5));
}