A TimeZone Aware DateTime Implementation

using NUnit.Framework;
using DateTimeZone;

namespace TestDateTimeZone
{
    /// <summary>
    /// Summary description for UtcDateTimeTest
    /// </summary>
    [TestFixture]
    public class UtcDateTimeTest
    {
        
        [Test]
		public void TestLocalDateTimeCreation()
		{
			//winter time test
			LocalDateTime anHour = new LocalDateTime(2009, 10, 1, 23, 0, 0, TimeZones.UTC, true);

			Assert.AreEqual(23, anHour.Hour);
		}

		[Test]
		public void TestUtcCreation()
		{
			//winter time test
			UtcDateTime anHour = new UtcDateTime(2009, 10, 1, 23, 0, 0);

			Assert.AreEqual(23, anHour.Hour);
		}


		[Test]
		public void TestUtcMin()
		{
			UtcDateTime oct1st2300 = new UtcDateTime(2009, 10, 1, 23, 0, 0);
			UtcDateTime oct1st2200 = new UtcDateTime(2009, 10, 1, 22, 0, 0);

			UtcDateTime minUtcDateTime = DateUtil.Min(oct1st2300, oct1st2200);
			Assert.IsTrue(minUtcDateTime.GetDateTime() == oct1st2200.GetDateTime());
		}

		[Test]
		public void TestUtcMax()
		{
			UtcDateTime oct1st2300 = new UtcDateTime(2009, 10, 1, 23, 0, 0);
			UtcDateTime oct1st2200 = new UtcDateTime(2009, 10, 1, 22, 0, 0);

			UtcDateTime maxUtcDateTime = DateUtil.Max(oct1st2300, oct1st2200);
			Assert.IsTrue(maxUtcDateTime.GetDateTime() == oct1st2300.GetDateTime());
		}

		[Test]
		public void TestStartOfDayInCETTimeZone()
		{
			UtcDateTime utc = new UtcDateTime(2009, 5,1,23,35,0);

			CetDateTime cetDateTime = new CetDateTime(utc.ToLocalDateTime(TimeZones.CET));
			CetDateTime startOfDay = (CetDateTime) cetDateTime.Date;

			Assert.IsTrue(startOfDay.Equals(new CetDateTime(2009, 5, 2, 0, 0, 0)));

		}

		[Test]
		public void TestEndOfDayInCETTimeZone()
		{
			UtcDateTime utc = new UtcDateTime(2009, 5, 1, 23, 35, 0);

			CetDateTime cetDateTime = new CetDateTime(utc.ToLocalDateTime(TimeZones.CET));
			LocalDateTime time = cetDateTime.Date.AddDays(1).AsLocalDateTime();
			
			CetDateTime endOfDay = new CetDateTime(time.GetDateTime());

			Assert.IsTrue(endOfDay.Equals(new CetDateTime(2009, 5, 3, 0, 0, 0)));

		}

		[Test]
		public void TestNull()
		{
			UtcDateTime nullUtc = UtcDateTime.Null;
			Assert.IsTrue(nullUtc.IsNull);
			Assert.AreEqual(TimeZones.UTC, nullUtc.TimeZone);
		}

		[Test]
		public void TestCompareTo()
		{
			UtcDateTime referenceDateTime = new UtcDateTime(2009, 11, 13, 12, 0, 0);

			// Compare the reference date time with another equal date time, CompareTo should then return 0
			UtcDateTime equalDateTime = new UtcDateTime(2009, 11, 13, 12, 0, 0);
			int compareToResult = referenceDateTime.CompareTo(equalDateTime);
			Assert.IsTrue(compareToResult == 0);

			// Compare the reference date time with a date time which is earlier, CompareTo should then return a positive value
			// because the reference date time is larger than the earlier date time.
			UtcDateTime earlierDateTime = new UtcDateTime(2009, 11, 13, 11, 0, 0);
			compareToResult = referenceDateTime.CompareTo(earlierDateTime);
			Assert.IsTrue(compareToResult > 0);

			// Compare the reference date time with a date time which is later, CompareTo should then return a negative value
			// because the reference date time is smaller than the later date time.
			UtcDateTime laterDateTime = new UtcDateTime(2009, 11, 13, 13, 0, 0);
			compareToResult = referenceDateTime.CompareTo(laterDateTime);
			Assert.IsTrue(compareToResult < 0);
		}
    }
}