public void QueryRangeItemTest()
{
RangeCollection <MyRangeItem> collection = new RangeCollection <MyRangeItem>();
collection.Add(new MyRangeItem(1, 10));
var result = collection.Get(1).ToList();
Assert.IsTrue(result[0].start == 1 && result[0].length == 10);
result = collection.Get(0, 20).ToList();
Assert.IsTrue(result[0].start == 1 && result[0].length == 10);
collection.Add(new MyRangeItem(15, 10));
result = collection.Get(0, 20).ToList();
Assert.IsTrue(result[0].start == 1 && result[0].length == 10);
Assert.IsTrue(result[1].start == 15 && result[0].length == 10);
}