public void Indexer_Setter_Exception_IndexIsEqualToCount()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 10);
Assert.ThrowsException<ArgumentOutOfRangeException>(() => list[22] = 100);
}
public void Indexer_Getter_ReturnsPlaceholderBeforeSetElement()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 10);
list[10] = 42;
Assert.AreEqual(0, list[9]);
}
public void Indexer_SettingAndGettingReturnsSameElement_EndOfPage()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 10);
list[19] = 42;
Assert.AreEqual(42, list[19]);
}
public void PageCacheSize_SetterSetsValue()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.PageCacheSize = 5;
Assert.AreEqual(5, list.PageCacheSize);
}
public void WithPageCacheSize_GettingValues_PushesPageUpInRecentlyUsedPagesList()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>() { PageCacheSize = 3 };
list.UpdateCount(50, 10);
list[15] = 5;
list[25] = 10;
list[35] = 15;
list[45] = 20;
int item25 = list[25];
list[10] = 25;
Assert.AreEqual(25, list[10]);
Assert.AreEqual(0, list[15]);
Assert.AreEqual(10, list[25]);
Assert.AreEqual(0, list[35]);
Assert.AreEqual(20, list[45]);
}
public void GetEnumerator_NonGeneric_EnumeratesArray()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 3);
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, 0, 0 }, result);
}
public void UpdateCount_Exception_CountIsLessThanZero()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
Assert.ThrowsException<ArgumentOutOfRangeException>(() => list.UpdateCount(-1, 10));
}
public void UpdateCount_ChangingPageNumber_PreservesExistingValues()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 10);
list[15] = 42;
list.UpdateCount(50, 10);
Assert.AreEqual(42, list[15]);
}
public void CopyTo_CopiesToDestinationArray()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 3);
list[2] = 8;
list[10] = 42;
int[] destination = new int[27];
destination[1] = 1;
destination[5] = 2;
destination[24] = 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, 0, 0, 3, 0, 0 }, destination);
}
public void Contains_ReturnsFalseIfNotInList()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 10);
list[2] = 8;
list[10] = 42;
bool result = list.Contains(15);
Assert.AreEqual(false, result);
}
public void Contains_ReturnsTrueIfItemInList()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 10);
list[2] = 8;
list[10] = 42;
bool result = list.Contains(42);
Assert.AreEqual(true, result);
}
public void Clear_ClearsTheList()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 10);
list.Clear();
Assert.AreEqual(0, list.Count);
}
public void Constructor_Void_CollectionIsEmpty()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
Assert.AreEqual(0, list.Count);
}
public void Add_AddsNewItemToList()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 10);
list.Add(123);
Assert.AreEqual(23, list.Count);
Assert.AreEqual(123, list[22]);
}
public void PageCacheSize_Exception_ValueIsLessThanZero()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
Assert.ThrowsException<ArgumentOutOfRangeException>(() => list.PageCacheSize = -1);
}
public void UpdateCount_UpdatesCountProperty()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 10);
Assert.AreEqual(22, list.Count);
}
public void UpdateCount_UpdatesPageSizeProperty()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 10);
Assert.AreEqual(10, list.PageSize);
}
public void IndexOf_ReturnsIndexOfItemInList()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 10);
list[2] = 8;
list[10] = 42;
int result = list.IndexOf(42);
Assert.AreEqual(10, result);
}
public void UpdateCount_ChangingPageSize_ClearsExistingValues()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 10);
list[12] = 42;
list.UpdateCount(22, 5);
for (int i = 0; i < list.Count; i++)
Assert.AreEqual(0, list[i]);
}
public void IndexOf_ReturnsMinusOneIfNotInList()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(22, 10);
list[2] = 8;
list[10] = 42;
int result = list.IndexOf(15);
Assert.AreEqual(-1, result);
}
public void UpdateCount_Exception_PageSizeIsLessThanOne()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
Assert.ThrowsException<ArgumentOutOfRangeException>(() => list.UpdateCount(22, 0));
}
public void Insert_InsertsItemIntoList()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(20, 6);
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 WithPageCacheSize_SettingMultipleItemsInSinglePage_CachesAllValues()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>() { PageCacheSize = 3 };
list.UpdateCount(50, 10);
list[11] = 5;
list[12] = 10;
list[13] = 15;
list[14] = 20;
list[15] = 25;
list[16] = 30;
list[17] = 35;
Assert.AreEqual(5, list[11]);
Assert.AreEqual(10, list[12]);
Assert.AreEqual(15, list[13]);
Assert.AreEqual(20, list[14]);
Assert.AreEqual(25, list[15]);
Assert.AreEqual(30, list[16]);
Assert.AreEqual(35, list[17]);
}
public void Insert_Exception_IndexIsGreaterThanCount()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(20, 6);
Assert.ThrowsException<ArgumentOutOfRangeException>(() => list.Insert(21, 123));
}
public void WithPageCacheSize_SettingValues_ClearsLeastRecentPages()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>() { PageCacheSize = 3 };
list.UpdateCount(50, 10);
list[15] = 5;
list[25] = 10;
list[35] = 15;
list[45] = 20;
list[10] = 25;
Assert.AreEqual(25, list[10]);
Assert.AreEqual(0, list[15]);
Assert.AreEqual(0, list[25]);
Assert.AreEqual(15, list[35]);
Assert.AreEqual(20, list[45]);
}
public void Remove_ReturnsFalseForItemNotInList()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(20, 6);
list[2] = 8;
list[5] = 10;
list[10] = 42;
bool result = list.Remove(12);
Assert.AreEqual(false, result);
}
public void RemoveAt_RemovesItemFromList()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(20, 6);
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 RemoveAt_Exception_IndexIsEqualToCount()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(20, 6);
Assert.ThrowsException<ArgumentOutOfRangeException>(() => list.RemoveAt(20));
}
public void Indexer_Getter_ReturnsPlaceholderFarAfterSetElement()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
list.UpdateCount(2000, 100);
list[10] = 42;
Assert.AreEqual(0, list[1990]);
}
public void PageCacheSize_IsInitiallyMaxValue()
{
PageVirtualizingList<int> list = new PageVirtualizingList<int>();
Assert.AreEqual(int.MaxValue, list.PageCacheSize);
}
