void TestAddTo(LongSet input, long constant)
{
Assert.AreEqual(
input.Values.Select(e => unchecked (e + constant)).OrderBy(e => e).ToList(),
input.AddOffset(constant).Values.ToList());
}
void TestAddTo(LongSet input, long constant)
{
Assert.AreEqual(
input.Values.Select(e => unchecked (e + constant)).OrderBy(e => e).ToList(),
input.AddOffset(constant).Values.ToList());
}