Util Library and Extension Methods

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NUnit.Framework;
using DateTimeExtensions;
namespace TestExtensions
{
    [TestFixture]
    public class Date
    {
        [Test]
        public void TEST_MIDNIGHT_NOON()
        {
            DateTime dateTime1 = new DateTime(2009, 11, 2,5,5,5);
            DateTime result1 = new DateTime(2009, 11, 2,12,0,0);

            DateTime dateTime2 = new DateTime(2009, 11, 1,4,3,10);
            DateTime result2 = new DateTime(2009, 11, 1,0,0,0);
          
            Assert.AreEqual(result1, dateTime1.Noon());
            Assert.AreEqual(result2, dateTime2.MidNight());
        }

        [Test]
        public void TEST_TIMESPAN_TO_WORDS()
        {
            TimeSpan timeSpan1 = new TimeSpan(5, 11, 2, 5);
            string result1 = "5 days, 11 hours, 2 minutes and 5 seconds";

            TimeSpan timeSpan2 = new TimeSpan(7, 1, 0, 0);
            string result2 = "1 week and 1 hour";

            TimeSpan timeSpan3 = new TimeSpan(365, 24, 0, 0);
            string result3 = "1 year and 1 day";

            TimeSpan timeSpan4 = new TimeSpan(14, 24, 0, 0);
            string result4 = "2 weeks and 1 day";

            Assert.AreEqual(result1, timeSpan1.ToWords());
            Assert.AreEqual(result2, timeSpan2.ToWords());
            Assert.AreEqual(result3, timeSpan3.ToWords());
            Assert.AreEqual(result4, timeSpan4.ToWords());
        }
        [Test]
        public void TEST_DATE_WITHIN_RANGE()
        {
            DateTime dateTime1 = new DateTime(2009, 1, 1);
            DateTime floor1 = new DateTime(2008, 12, 31);
            DateTime ceiling1 = new DateTime(2009, 1, 2);

            DateTime dateTime2 = new DateTime(2009, 1, 1);
            DateTime floor2 = new DateTime(2008, 1, 12);
            DateTime ceiling2 = new DateTime(2008, 12, 31);

            DateTime dateTime3 = new DateTime(2009, 1, 1);
            DateTime floor3 = new DateTime(2009, 1, 1);
            DateTime ceiling3 = new DateTime(2009, 1, 2);

            Assert.AreEqual(true,dateTime1.IsWithinRange(floor1,ceiling1,true));
            Assert.AreEqual(false,dateTime1.IsWithinRange(floor2,ceiling2,true));
            Assert.AreEqual(true,dateTime1.IsWithinRange(floor3,ceiling3,true));
            Assert.AreEqual(false,dateTime1.IsWithinRange(floor3,ceiling3,false));
        }
        [Test]
        public void TEST_TIME_SPAN()
        {
            DateTime futureDate = DateTime.Now.Add(new TimeSpan(2,3,4));
            DateTime pastDate = DateTime.Now.Subtract(new TimeSpan(2, 3, 4));

            TimeSpan result1 = new TimeSpan(2, 3, 4);

            Assert.AreEqual(result1, futureDate.GetTimeSpan());
            Assert.AreEqual(result1, pastDate.GetTimeSpan());
        }
    }
}