public void Add_IfTimestampsDifferMoreThanBucketInterval_ShouldCreateNewBucket(int bucketInterval, int shift)
{
// Arrange
var window = new SlidingWindow <Trade>(TimeSpan.FromMinutes(1), bucketInterval, Trade.CreateCalculation);
var olderItem = CreateTradeItem(DateTime.Now.AddMilliseconds(shift));
var newerItem = CreateTradeItem(DateTime.Now);
// Act
window.Add(olderItem);
window.Add(newerItem);
// Assert
var buckets = window.GetBuckets().Item2;
var firstBucket = buckets[window.GetTimeStampKey(olderItem.TimeStamp)];
var secondBucket = buckets[window.GetTimeStampKey(newerItem.TimeStamp)];
Assert.NotEqual(firstBucket, secondBucket);
}
public void Add_NewItemAdded_ShouldCleanUpOldBuckets()
{
// Arrange
var window = new SlidingWindow <Trade>(TimeSpan.FromMilliseconds(100), 1000, Trade.CreateCalculation, testDateTimeProvider);
var olderItem = CreateTradeItem(DateTime.Now.AddMilliseconds(-1000));
var newerItem = CreateTradeItem(DateTime.Now);
// Act
testDateTimeProvider.Now = olderItem.TimeStamp;
window.Add(olderItem);
testDateTimeProvider.Now = newerItem.TimeStamp;
window.Add(newerItem);
// Assert
var bucketsList = window.GetBuckets().Item1;
var buckets = window.GetBuckets().Item2;
Assert.Single(buckets);
Assert.Single(bucketsList);
Assert.False(buckets.ContainsKey(window.GetTimeStampKey(olderItem.TimeStamp)));
Assert.Equal(window.GetTimeStampKey(newerItem.TimeStamp), bucketsList.First.Value.TimeStampKey);
}
public void Add_WhenBucketsAreOlderThanInterval_ShouldRemoveOlderBuckets()
{
// Arrange
var windowInterval = TimeSpan.FromMilliseconds(500);
var items = CreateTradeItemsList(new[] { -2000, -1000, 0 }, new[] { 200, 100, 10 });
var window = new SlidingWindow <Trade>(windowInterval, 500, Trade.CreateCalculation, testDateTimeProvider);
// Act
foreach (var item in items)
{
testDateTimeProvider.Now = item.TimeStamp;
window.Add(item);
}
var buckets = window.GetBuckets().Item1;
var expectedOldestTimeStampKey = window.GetTimeStampKey(testDateTimeProvider.Now.Add(-windowInterval * 2));
// Assert
Assert.True(buckets.All(b => b.TimeStampKey >= expectedOldestTimeStampKey));
}
