public void AddsItemsToEmptyCollection()
{
var collection = new Collection<int>();
var newList = new List<int> { 4, 5, 6 };
collection.AddRange(newList);
Assert.AreEqual(3, collection.Count);
Assert.AreEqual(4, collection[0]);
Assert.AreEqual(5, collection[1]);
Assert.AreEqual(6, collection[2]);
}