public void GroupByDaysAndMidnight()
{
var sw = Stopwatch.StartNew();
var result = _unitUnderTest5h.GroupByDays(3, a => a.First()).Rows;
var result2 = _unitUnderTest5h.Group(g => g.ByTime.Days(3).Aggregate(a => a.First())).Rows;
result.First().TimeUtc.Should().Be(new DateTime(2010, 5, 19, 0, 0, 0, DateTimeKind.Local).ToUniversalTime());
result.SequenceEqual(result2).Should().BeTrue();
var last = result.Last();
sw.Stop();
}
