public void FindLowerBound()
{
var values = new[] { 1, 1, 3, 3 };
Assert.That(values.FindLowerBound(4), Is.EqualTo(4));
Assert.That(values.FindLowerBound(3), Is.EqualTo(2));
Assert.That(values.FindLowerBound(2), Is.EqualTo(2));
Assert.That(values.FindLowerBound(1), Is.EqualTo(0));
Assert.That(values.FindLowerBound(0), Is.EqualTo(0));
}