StatisticsTests.cs

using System;
using System.Collections.Generic;
using NUnit.Framework;

namespace linq_slideviews
{
	[TestFixture]
	public class StatisticsTests
	{
		[Test]
		public void ManyVisitsOfOneUser()
		{
			var time = DateTime.Now;
			var visits = new List<VisitRecord>
			{
				new VisitRecord(1, 10, time, SlideType.Exercise),
				new VisitRecord(1, 11, time + TimeSpan.FromMinutes(2), SlideType.Exercise),
				new VisitRecord(1, 12, time + TimeSpan.FromMinutes(4), SlideType.Exercise),
				new VisitRecord(1, 13, time + TimeSpan.FromMinutes(8), SlideType.Quiz),
				new VisitRecord(1, 14, time + TimeSpan.FromMinutes(100), SlideType.Exercise)
			};
			var median = StatisticsTask.GetMedianTimePerSlide(visits, SlideType.Exercise);
			Assert.AreEqual(2, median, 1e-5);
		}

		[Test]
		public void NoVisits()
		{
			var median = StatisticsTask.GetMedianTimePerSlide(new List<VisitRecord>(), SlideType.Exercise);
			Assert.AreEqual(0, median, 1e-5);
		}

		[Test]
		public void NoMatchingVisits()
		{
			var time = DateTime.Now;
			var visits = new List<VisitRecord>
			{
				new VisitRecord(1, 10, time, SlideType.Quiz),
				new VisitRecord(1, 11, time + TimeSpan.FromMinutes(2), SlideType.Quiz)
			};
			var median = StatisticsTask.GetMedianTimePerSlide(visits, SlideType.Exercise);
			Assert.AreEqual(0, median, 1e-5);
		}

		[Test]
		public void TwoUsers()
		{
			var time = DateTime.Now;
			var visits = new List<VisitRecord>
			{
				new VisitRecord(1, 10, time, SlideType.Exercise),
				new VisitRecord(1, 11, time + TimeSpan.FromMinutes(2), SlideType.Exercise),
				new VisitRecord(2, 13, time + TimeSpan.FromMinutes(100), SlideType.Exercise),
				new VisitRecord(2, 14, time + TimeSpan.FromMinutes(110), SlideType.Exercise),
				new VisitRecord(2, 15, time + TimeSpan.FromMinutes(120), SlideType.Exercise)
			};
			var median = StatisticsTask.GetMedianTimePerSlide(visits, SlideType.Exercise);
			Assert.AreEqual(10, median, 1e-5);
		}

		[Test]
		public void TwoVisits()
		{
			var time = DateTime.Now;
			var visits = new List<VisitRecord>
			{
				new VisitRecord(1, 10, time, SlideType.Exercise),
				new VisitRecord(1, 11, time + TimeSpan.FromMinutes(2), SlideType.Exercise)
			};
			var median = StatisticsTask.GetMedianTimePerSlide(visits, SlideType.Exercise);
			Assert.AreEqual(2, median, 1e-5);
		}
	}
}