public void CanAddAndFind()
{
var rangeSet = new RangeSet <int>(0);
for (var i = 10; i <= 1000; i += 10)
{
rangeSet.Add(i, i);
}
for (var i = 0; i < 1000; i += 3)
{
int n;
var r = rangeSet.TryFind(i, out n);
Assert.That(r, Is.True);
Assert.That(n, Is.EqualTo(i + 10 - i % 10.0).Or.EqualTo(i - i % 10.0));
}
}