public void GroupByExpressionHours()
{
var sw = Stopwatch.StartNew();
INullableQuerySerie <float> nullableQuerySerie = _unitUnderTest9m.GroupBy("3h", a => a.First());
IReadOnlyList <ISingleDataRow <float?> > result = nullableQuerySerie.Rows;
IObjectQuerySerie result2 = nullableQuerySerie;
object val = result2.Rows.First().Value;
result[0].TimeUtc.Should().Be(new DateTime(2010, 1, 1, 12, 0, 0, DateTimeKind.Utc));
result[1].TimeUtc.Should().Be(new DateTime(2010, 1, 1, 15, 0, 0, DateTimeKind.Utc));
sw.Stop();
}
