A TimeZone Aware DateTime Implementation

/*
 * Created by: Steinar Dragsnes
 * Created: 12-apr-2009
 */

using System;
using DateTimeZone;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace TEST.DateTimeZone
{
    [TestClass]
    public class DayFractionTest
    {
        private double df1double;
        private double df2double;
        private TimeSpan oneDayAndAHalfTimeSpan;
        private double df1Plus1double;
        private double df1Minus1double;

        /// <summary>
        /// Sets up testvalues
        /// </summary>
        [TestInitialize]
        public void SetUp()
        {
            df1double = 2.5;
            df2double = 1.5;
            oneDayAndAHalfTimeSpan = new TimeSpan(1, 12, 0, 0);
            df1Plus1double = 3.5;
            df1Minus1double = 1.5;
        }

        /// <summary>
        /// Tests creation from a double value
        /// </summary>
        [TestMethod]
        public void TestCreateDFFromDouble()
        {
            DayFraction fraction = new DayFraction(df1double);
            Assert.AreEqual(fraction.Days, df1double);
        }

        /// <summary>
        /// tests comparison using Nunit Asserts
        /// </summary>
        [TestMethod]
        public void TestComparison()
        {
            DayFraction fraction1 = new DayFraction(df1double);
            DayFraction fraction1Copy = fraction1;
            DayFraction fraction2 = new DayFraction(df2double);
            Assert.IsTrue(2 > 1);
            Assert.IsTrue(fraction1 > fraction2);
            Assert.IsTrue(1 < 2);
            Assert.IsTrue(fraction2 < fraction1);
            Assert.AreNotSame(fraction1, fraction2);
            Assert.AreEqual(fraction1, fraction1Copy);
        }

        /// <summary>
        /// Tests comparison using operators
        /// </summary>
        [TestMethod]
        public void TestComparisonOperators()
        {
            DayFraction df1 = new DayFraction(df1double);
            DayFraction df1Copy = df1;
            DayFraction df2 = new DayFraction(df2double);

            Assert.IsTrue(df1 >= df2);
            Assert.IsTrue(df1 > df2);
            Assert.IsTrue(df1Copy >= df1);
            Assert.IsTrue(df2 < df1);
            Assert.IsTrue(df2 <= df1);
            Assert.IsTrue(df1Copy <= df1);
            Assert.IsTrue(df2 != df1);
        }

        /// <summary>
        /// Tests addition operator
        /// </summary>
        [TestMethod]
        public void TestPlus1WithinDayFractionAndDouble()
        {
            DayFraction df1 = new DayFraction(df1double);
            DayFraction df1Plus1 = new DayFraction(df1Plus1double);
            Assert.AreEqual(df1Plus1, df1 + 1);
        }

        /// <summary>
        /// Tests addition operator
        /// </summary>
        [TestMethod]
        public void TestPlus1WithinDayFractions()
        {
            DayFraction df1 = new DayFraction(df1double);
            DayFraction df1Plus1 = new DayFraction(df1Plus1double);
            Assert.AreEqual(df1Plus1, df1 + new DayFraction(1));
        }

        /// <summary>
        /// Tests addition operator
        /// </summary>
        [TestMethod]
        public void TestPlus1WithinDoubleAndDayFraction()
        {
            DayFraction df1 = new DayFraction(df1double);
            DayFraction df1Plus1 = new DayFraction(df1Plus1double);
            Assert.AreEqual(3.5, 1 + df1);
        }

        /// <summary>
        /// Tests subtraction operator
        /// </summary>
        [TestMethod]
        public void TestMinus1WithinDayFractions()
        {
            DayFraction df1 = new DayFraction(df1double);
            DayFraction df1Minus1 = new DayFraction(df1Minus1double);
            Assert.AreEqual(df1 - df1Minus1, new DayFraction(1));
        }

        /// <summary>
        /// Tests subtraction operator
        /// </summary>
        [TestMethod]
        public void TestMinus1WithinDayFractionAndDouble()
        {
            DayFraction df1 = new DayFraction(df1double);
            Assert.AreEqual(df1 - 1.5, new DayFraction(1));
        }

        /// <summary>
        /// Tests subtraction operator
        /// </summary>
        [TestMethod]
        public void TestMinus1WithinDoubleAndDayFraction()
        {
            DayFraction df1Minus1 = new DayFraction(df1Minus1double);
            Assert.AreEqual(2.5 - df1Minus1, 1);
        }

        /// <summary>
        /// Tests average calculation
        /// </summary>
        [TestMethod]
        public void TestDivision()
        {
            DayFraction df2 = new DayFraction(df2double);
            DayFraction df1Minus1 = new DayFraction(df1Minus1double);
            Assert.AreEqual(df1Minus1 / df2, new DayFraction(1));
            Assert.AreEqual(df1Minus1 / 1.5, new DayFraction(1));
            Assert.AreEqual(1.5 / df2, new DayFraction(1));
        }

        /// <summary>
        /// Test the hashcode of 2 instances
        /// </summary>
        [TestMethod]
        public void TestIdentity()
        {
            DayFraction df1 = new DayFraction(df1double);
            DayFraction df1Copy = df1;
            Assert.AreEqual(df1.GetHashCode(), df1Copy.GetHashCode());
        }

        [TestMethod]
        public void TestGetTimeSpan()
        {
            DayFraction df2 = new DayFraction(df2double);
            Assert.AreEqual(df2.GetTimeSpan(), oneDayAndAHalfTimeSpan);
        }
    }
}