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 *     following disclaimer. 
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 *     following disclaimer in the documentation and/or other 
 *     materials provided with the distribution. 
 * 
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using System;
using XenCenterLib;
using NUnit.Framework;

namespace XenAdminTests.MiscTests
{
    [TestFixture, Category(TestCategories.UICategoryB)]
    class TimeUtilTests
    {
        private readonly long ticksSecondsFactor = Convert.ToInt64(1e7);

        [Test]
        public void TicksToSecondsConversion()
        {
            Assert.AreEqual(73, TimeUtil.TicksToSeconds(73*ticksSecondsFactor));
            Assert.AreEqual(0, TimeUtil.TicksToSeconds(0));
        }

        [Test]
        public void TicksBefore1970Check()
        {
            Assert.AreEqual(621355968000000000, TimeUtil.TicksBefore1970);
        }

        [Test]
        public void ISO8601DateFormatStringCheck()
        {
            Assert.AreEqual("yyyyMMddTHH:mm:ssZ", TimeUtil.ISO8601DateFormat);
        }

        [Test]
        public void TicksToSecondsSince1970Conversion()
        {
            Assert.AreEqual((-1 * TimeUtil.TicksBefore1970 / ticksSecondsFactor), TimeUtil.TicksToSecondsSince1970(0));
            Assert.AreEqual(0, TimeUtil.TicksToSecondsSince1970(TimeUtil.TicksBefore1970));
            Assert.AreEqual(1324771200, TimeUtil.TicksToSecondsSince1970(new DateTime(2011,12,25).Ticks));
        }

        [Test]
        public void ISODateTimeParse()
        {
            DateTime derived = TimeUtil.ParseISO8601DateTime("20111225T10:20:37Z");
            Assert.AreEqual(new DateTime(2011, 12, 25, 10, 20, 37), derived );
            Assert.AreEqual(DateTimeKind.Utc, derived.Kind);
        }

        [Test]
        public void ISODateTimeParseWithBadFormat()
        {
            Assert.That(() => TimeUtil.ParseISO8601DateTime("20111225T1020:37Z"), Throws.Exception.With.TypeOf(typeof(FormatException)));
        }

        [Test]
        public void ISODateTimeParseWithNullArg()
        {
            Assert.That(() => TimeUtil.ParseISO8601DateTime(null), Throws.ArgumentNullException);
        }

        [Test]
        public void ToISODateTime()
        {
            string derived = TimeUtil.ToISO8601DateTime(new DateTime(2011, 12, 25, 10, 20, 37, DateTimeKind.Utc));
            Assert.AreEqual("20111225T10:20:37Z", derived);
        }

        [Test]
        public void ISODateTimeRoundTrip()
        {
            const string dateToParse = "20111225T10:20:37Z";
            string derived = TimeUtil.ToISO8601DateTime(TimeUtil.ParseISO8601DateTime(dateToParse));
            Assert.AreEqual(dateToParse, derived);
        }

    }
}
