public void Indexer_Setter_Exception_IndexIsEqualToCount()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
Assert.ThrowsException<ArgumentOutOfRangeException>(() => list[20] = 100);
}
public void Indexer_SettingAndGettingReturnsSameElement()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
list[10] = 42;
Assert.AreEqual(42, list[10]);
}
public void Indexer_Getter_ReturnsPlaceholderFarAfterSetElement()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(2000);
list[10] = 42;
Assert.AreEqual(0, list[1990]);
}
public void Insert_Exception_IndexIsGreaterThanCount()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
Assert.ThrowsException<ArgumentOutOfRangeException>(() => list.Insert(21, 123));
}
public void GetEnumerator_NonGeneric_EnumeratesArray()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
list[2] = 8;
list[10] = 42;
List<int> result = new List<int>();
IEnumerator enumerator = ((IEnumerable)list).GetEnumerator();
while (enumerator.MoveNext())
result.Add((int)enumerator.Current);
CollectionAssert.AreEqual(new int[] { 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 42, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, result);
}
public void UpdateCount_Exception_CountIsLessThanZero()
{
VirtualizingList<int> list = new VirtualizingList<int>();
Assert.ThrowsException<ArgumentOutOfRangeException>(() => list.UpdateCount(-1));
}
public void UpdateCount_UpdatesCountProperty()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
Assert.AreEqual(20, list.Count);
}
public void RemoveAt_Exception_IndexIsEqualToCount()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
Assert.ThrowsException<ArgumentOutOfRangeException>(() => list.RemoveAt(20));
}
public void RemoveAt_RemovesItemFromList()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
list[2] = 8;
list[5] = 10;
list[10] = 42;
list.RemoveAt(5);
Assert.AreEqual(19, list.Count);
Assert.AreEqual(8, list[2]);
Assert.AreEqual(42, list[9]);
}
public void Remove_ReturnsFalseForItemNotInList()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
list[2] = 8;
list[5] = 10;
list[10] = 42;
bool result = list.Remove(12);
Assert.AreEqual(false, result);
}
public void Clear_ClearsTheList()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
list.Clear();
Assert.AreEqual(0, list.Count);
}
public void Insert_InsertsItemIntoList()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
list[2] = 8;
list[10] = 42;
list.Insert(5, 123);
Assert.AreEqual(21, list.Count);
Assert.AreEqual(8, list[2]);
Assert.AreEqual(123, list[5]);
Assert.AreEqual(42, list[11]);
}
public void IndexOf_ReturnsMinusOneIfNotInList()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
list[2] = 8;
list[10] = 42;
int result = list.IndexOf(15);
Assert.AreEqual(-1, result);
}
public void IndexOf_ReturnsIndexOfItemInList()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
list[2] = 8;
list[10] = 42;
int result = list.IndexOf(42);
Assert.AreEqual(10, result);
}
public void CopyTo_CopiesToDestinationArray()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
list[2] = 8;
list[10] = 42;
int[] destination = new int[25];
destination[1] = 1;
destination[5] = 2;
destination[22] = 3;
list.CopyTo(destination, 2);
CollectionAssert.AreEqual(new int[] { 0, 1, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 42, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0 }, destination);
}
public void Contains_ReturnsFalseIfNotInList()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
list[2] = 8;
list[10] = 42;
bool result = list.Contains(15);
Assert.AreEqual(false, result);
}
public void Contains_ReturnsTrueIfItemInList()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
list[2] = 8;
list[10] = 42;
bool result = list.Contains(42);
Assert.AreEqual(true, result);
}
public void Indexer_Getter_Exception_IndexIsLessThanZero()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
Assert.ThrowsException<ArgumentOutOfRangeException>(() => list[-1]);
}
public void Add_AddsNewItemToList()
{
VirtualizingList<int> list = new VirtualizingList<int>();
list.UpdateCount(20);
list.Add(123);
Assert.AreEqual(21, list.Count);
Assert.AreEqual(123, list[20]);
}