Dynamic Unit Testing

using System;

namespace Business
{
    public static class RangeExtensions
    {
        public static bool Between<T>(this IComparable<T> value, IRange<T> range) where T : IComparable<T>
        {
            return value.CompareTo(range.Start) >= 0 && value.CompareTo(range.End) <= 0;
        }
    }
}