using System;
using Xunit;

namespace DateTimeStudy.XUnitTest
{
    public class DateTimeStudyTest:IDisposable
    {
        /// <summary>
        /// 构造函数：单元测试前的准备
        /// </summary>
        public DateTimeStudyTest()
        {

        }

        [Fact]
        public void Test1()
        {
            Assert.Equal(1, 1.0);
        }

        [Fact]
        public void CreateDateTimeDefaultTest()
        {
            DateTimeStudy sudy = new DateTimeStudy();
            //无参时间:0001年1月1日 0时 0分 0秒
            var time = sudy.CreateDateTime();
            Assert.True(time.Year==1 && time.Month==1 && time.Day==1 && time.Hour==0 && time.Minute==0 && time.Second==0 && time.Millisecond==0);
            Assert.True(time.Kind == DateTimeKind.Unspecified);
        }

        [Fact]
        public void CreateDateTime4TicksTest()
        {
            DateTimeStudy sudy = new DateTimeStudy();
            //UTC时间:2018-01-01
            long ticks = 636503616000000000;
            var time = sudy.CreateDateTime(ticks);
            Assert.True(time.Year == 2018 && time.Month == 1 && time.Day == 1 && time.Hour == 0 && time.Minute == 0 && time.Second == 0 && time.Millisecond == 0);
            Assert.True(new DateTime(2018, 1, 1, 0, 0, 0, DateTimeKind.Local) == time);
            Assert.True(time.Kind == DateTimeKind.Unspecified);
        }

        [Fact]
        public void CreateDateTimeTest4()
        {
            DateTimeStudy sudy = new DateTimeStudy();
            //UTC时间:2018-01-01
            long ticks = 636503616000000000;
            var time = sudy.CreateDateTime(ticks, DateTimeKind.Utc);
            var time2 = sudy.CreateDateTime(ticks, DateTimeKind.Local);

            //这很奇怪：竟然相等
            Assert.Equal<DateTime>(time, time2);
            Assert.True(time.Year == 2018 && time.Month == 1 && time.Day == 1 && time.Hour == 0 && time.Minute == 0 && time.Second == 0 && time.Millisecond == 0);
            Assert.True(time2.Year == 2018 && time2.Month == 1 && time2.Day == 1 && time2.Hour == 0 && time2.Minute == 0 && time2.Second == 0 && time2.Millisecond == 0);
            Assert.True(new DateTime(2018, 1, 1, 0, 0, 0, DateTimeKind.Local) == time);
            Assert.True(new DateTime(2018, 1, 1, 0, 0, 0, DateTimeKind.Utc) == time);
            Assert.True(new DateTime(2018, 1, 1, 0, 0, 0, DateTimeKind.Local) == time2);
            Assert.True(new DateTime(2018, 1, 1, 0, 0, 0, DateTimeKind.Utc) == time2);
            Assert.True(time.Kind == DateTimeKind.Utc);
            Assert.True(time2.Kind == DateTimeKind.Local);
        }

        /// <summary>
        /// 相当于析构函数：单元测试收尾清理
        /// </summary>
        public void Dispose()
        {

        }
    }
}