public void ObservableCollectionEx_TestRemoveRange()
{
ObservableCollectionEx <int> collection = new ObservableCollectionEx <int>();
List <int> list = new List <int>();
for (var i = 1; i <= 300000; i++)
{
list.Add(i);
}
collection.AddRange(list);
Assert.AreEqual(300000, collection.Count);
collection.RemoveRange(100000);
Assert.AreEqual(200000, collection.Count);
Assert.AreEqual(100001, collection[0]);
Assert.AreEqual(100050, collection[49]);
Assert.AreEqual(100051, collection[50]);
Assert.AreEqual(100100, collection[99]);
Assert.AreEqual(300000, collection[collection.Count - 1]);
collection.RemoveRange(50, 50);
Assert.AreEqual(199950, collection.Count);
Assert.AreEqual(100050, collection[49]);
Assert.AreEqual(100101, collection[50]);
Assert.AreEqual(100150, collection[99]);
Assert.AreEqual(300000, collection[collection.Count - 1]);
}