public void TrimTest()
{
var r = new Random();
var periods = Enum.GetValues(typeof(PriceHistoryPeriod)).Cast <PriceHistoryPeriod>();
foreach (var p in periods)
{
var minDate = GetMinDateForPeriod(p);
for (var i = 0; i < 5; i++)
{
var dateTime = minDate
.AddDays(r.Next(0, 1000))
.AddHours(r.Next(0, 24))
.AddMinutes(r.Next(0, 60))
.AddSeconds(r.Next(0, 60))
.AddMilliseconds(r.Next(0, 1000));
var trimmedDate = dateTime.Trim(p);
if (p == PriceHistoryPeriod.Month)
{
var date = default(DateTime);
while (date < trimmedDate)
{
date = date.AddMonths(1);
}
if (date == trimmedDate &&
date.Day == 1 &&
date.Hour == 0 &&
date.Minute == 0 &&
date.Second == 0 &&
date.Millisecond == 0)
{
continue;
}
}
else
{
var date = minDate.Ticks;
while (date < trimmedDate.Ticks)
{
date += PriceHistoryPeriodHelper.TicksPerPeriod(p);
}
if (date == trimmedDate.Ticks)
{
continue;
}
}
Assert.Fail($"Unable to trim {dateTime.Ticks} to {p} period.");
}
}
}
private DateTime GetMinDateForPeriod(PriceHistoryPeriod period)
{
var date = new DateTime(2000, 1, 1, 0, 0, 0, DateTimeKind.Utc);
if (period == PriceHistoryPeriod.Month)
{
return(date);
}
while (true)
{
date = date.AddTicks(PriceHistoryPeriodHelper.TicksPerPeriod(PriceHistoryPeriod.Minutes15));
if (date.Ticks % PriceHistoryPeriodHelper.TicksPerPeriod(period) == 0)
{
return(date);
}
}
}