public void TestMultiply()
{
Cartesian original = new Cartesian(1.0, 2.0, 3.0);
Cartesian multiplied = original * 5.0;
Assert.AreEqual(5.0, multiplied.X);
Assert.AreEqual(10.0, multiplied.Y);
Assert.AreEqual(15.0, multiplied.Z);
multiplied = 5.0 * original;
Assert.AreEqual(5.0, multiplied.X);
Assert.AreEqual(10.0, multiplied.Y);
Assert.AreEqual(15.0, multiplied.Z);
multiplied = original.Multiply(5.0);
Assert.AreEqual(5.0, multiplied.X);
Assert.AreEqual(10.0, multiplied.Y);
Assert.AreEqual(15.0, multiplied.Z);
}