public void TestRollingIndex()
{
const int size = 10;
const int testSize = 3 * size;
var rollingIndex = new RollingIndex <string>(size);
var items = new List <string>();
int i;
string item;
for (i = 0; i < testSize; i++)
{
item = $"item {i}";
rollingIndex.Add(item, i);
items.Add(item);
}
var(cached, lastIndex) = rollingIndex.GetLastWindow();
var expectedLastIndex = testSize - 1;
// last index
Assert.Equal(expectedLastIndex, lastIndex);
var start = testSize / (2 * size) * size;
var count = testSize - start;
for (i = 0; i < count; i++)
{
//Console.WriteLine("{0},{1}", items[start + i], cached[i]);
Assert.Equal(items[start + i], cached[i]);
}
var err = rollingIndex.Add("PassedIndex", expectedLastIndex - 1);
Assert.Equal(StoreErrorType.PassedIndex, err.StoreErrorType);
err = rollingIndex.Add("PassedIndex", expectedLastIndex + 2);
Assert.Equal(StoreErrorType.SkippedIndex, err.StoreErrorType);
(_, err) = rollingIndex.GetItem(9);
Assert.Equal(StoreErrorType.TooLate, err.StoreErrorType);
var indexes = new[] { 10, 17, 29 };
foreach (var id in indexes)
{
(item, err) = rollingIndex.GetItem(id);
Assert.Null(err);
item.ShouldCompareTo(items[id]);
}
(_, err) = rollingIndex.GetItem(lastIndex + 1);
Assert.Equal(StoreErrorType.KeyNotFound, err.StoreErrorType);
}
