public void GetHashCode_ReturnsUniqueOrderedValue()
{
IDictionary <int, SDate> hashes = new Dictionary <int, SDate>();
int lastHash = int.MinValue;
for (int year = 1; year <= 4; year++)
{
foreach (string season in SDateTests.ValidSeasons)
{
foreach (int day in SDateTests.ValidDays)
{
SDate date = new SDate(day, season, year);
int hash = date.GetHashCode();
if (hashes.TryGetValue(hash, out SDate otherDate))
{
Assert.Fail($"Received identical hash code {hash} for dates {otherDate} and {date}.");
}
if (hash < lastHash)
{
Assert.Fail($"Received smaller hash code for date {date} ({hash}) relative to {hashes[lastHash]} ({lastHash}).");
}
lastHash = hash;
hashes[hash] = date;
}
}
}
}