public void FindFreeSizeAfterWorks()
{
var l1 = new PtrLenList();
l1.TryInclude(0, 2);
l1.TryInclude(5, 5);
l1.TryInclude(15, 10);
Assert.AreEqual(25, l1.FindFreeSizeAfter(1, 6));
Assert.AreEqual(10, l1.FindFreeSizeAfter(1, 4));
Assert.AreEqual(2, l1.FindFreeSizeAfter(1, 3));
Assert.AreEqual(12, l1.FindFreeSizeAfter(12, 1));
}