public void IncBasicUsage()
{
// Arrange.
var impressionsCounter = new ImpressionsCounter();
impressionsCounter.Inc("feature1", SplitsHelper.MakeTimestamp(new DateTime(2020, 09, 02, 09, 15, 11, DateTimeKind.Utc)));
impressionsCounter.Inc("feature1", SplitsHelper.MakeTimestamp(new DateTime(2020, 09, 02, 09, 20, 11, DateTimeKind.Utc)));
impressionsCounter.Inc("feature1", SplitsHelper.MakeTimestamp(new DateTime(2020, 09, 02, 09, 50, 11, DateTimeKind.Utc)));
impressionsCounter.Inc("feature2", SplitsHelper.MakeTimestamp(new DateTime(2020, 09, 02, 09, 50, 11, DateTimeKind.Utc)));
impressionsCounter.Inc("feature2", SplitsHelper.MakeTimestamp(new DateTime(2020, 09, 02, 09, 55, 11, DateTimeKind.Utc)));
impressionsCounter.Inc("feature1", SplitsHelper.MakeTimestamp(new DateTime(2020, 09, 02, 10, 50, 11, DateTimeKind.Utc)));
// Act.
var result = impressionsCounter.PopAll();
// Assert.
Assert.AreEqual(3, result.FirstOrDefault(x => x.Key.SplitName.Equals("feature1") && x.Key.TimeFrame.Equals(SplitsHelper.MakeTimestamp(new DateTime(2020, 09, 02, 09, 0, 0, DateTimeKind.Utc)))).Value);
Assert.AreEqual(2, result.FirstOrDefault(x => x.Key.SplitName.Equals("feature2") && x.Key.TimeFrame.Equals(SplitsHelper.MakeTimestamp(new DateTime(2020, 09, 02, 09, 0, 0, DateTimeKind.Utc)))).Value);
Assert.AreEqual(1, result.FirstOrDefault(x => x.Key.SplitName.Equals("feature1") && x.Key.TimeFrame.Equals(SplitsHelper.MakeTimestamp(new DateTime(2020, 09, 02, 10, 0, 0, DateTimeKind.Utc)))).Value);
}