public void Problem1_PointClass_SideAffecting()
{
// Instantiate the problem
var target = new Problem1();
// Set up the test
int x = 5;
int y = 10;
var pointClass = new PointClass(x, y);
target.DoubleTheTargetPointClass(pointClass);
// Assert truths.
Assert.IsNotNull(pointClass);
Assert.AreEqual(x * 2, pointClass.X);
Assert.AreEqual(y * 2, pointClass.Y);
}