DocumentSystem Unit Tests

using System.Text;
using FreeContentCatalog;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace MainClassUnitTest
{
    [TestClass]
    public class MainClassUnitTest
    {
        [TestMethod]
        public void TestEmptyCatalog()
        {
            Catalog catalog = new Catalog();
            Assert.AreEqual(0, catalog.Count());
        }

        [TestMethod]
        public void TestOneItemAdd()
        {
            Catalog catalog = new Catalog();
            IContent item = new ContentItem(ContentType.Book,
                new string[] { "Intro C#", "S.Nakov", "12763892", "http://www.introprogramming.info" });
            catalog.Add(item);
            Assert.AreEqual(1, catalog.Count());
        }

        [TestMethod]
        public void TestTwoDifferentItemsAdd()
        {
            Catalog catalog = new Catalog();
            IContent item1 = new ContentItem(ContentType.Book,
                new string[] { "Intro C#", "S.Nakov", "12763892", "http://www.introprogramming.info" });
            catalog.Add(item1);
            IContent item2 = new ContentItem(ContentType.Song,
                new string[] { "Song C#", "Muncho", "12762", "http://www.mp3.info" });
            catalog.Add(item2);
            Assert.AreEqual(2, catalog.Count());
        }

        [TestMethod]
        public void TestTwoEqualItemsAdd()
        {
            Catalog catalog = new Catalog();
            IContent item1 = new ContentItem(ContentType.Book,
                new string[] { "Intro C#", "S.Nakov", "12763892", "http://www.introprogramming.info" });
            catalog.Add(item1);
            IContent item2 = new ContentItem(ContentType.Book,
                new string[] { "Intro C#", "S.Nakov", "12763892", "http://www.introprogramming.info" });
            catalog.Add(item2);
            Assert.AreEqual(2, catalog.Count());
        }

        [TestMethod]
        public void TestThreeItemsFindAll()
        {
            Catalog catalog = new Catalog();
            IContent item1 = new ContentItem(ContentType.Book,
                new string[] { "Intro C#", "S.Nakov", "12763892", "http://www.introprogramming.info" });
            catalog.Add(item1);
            IContent item2 = new ContentItem(ContentType.Book,
                new string[] { "Intro C#", "S.Nakov", "12763892", "http://www.introprogramming.info" });
            catalog.Add(item2);
            IContent item3 = new ContentItem(ContentType.Song,
                new string[] { "Song C#", "Muncho", "12762", "http://www.mp3.info" });
            catalog.Add(item3);
            var foundContent = catalog.GetListContent("Intro C#", 5);
            StringBuilder actual = new StringBuilder();
            foreach (IContent content in foundContent)
            {
                actual.AppendLine(content.ToString());
            }
            StringBuilder expected = new StringBuilder();
            expected.AppendLine(item1.ToString());
            expected.AppendLine(item2.ToString());

            Assert.AreEqual(expected.ToString(), actual.ToString());
        }

        [TestMethod]
        public void TestThreeItemsFindOneOnly()
        {
            Catalog catalog = new Catalog();
            IContent item1 = new ContentItem(ContentType.Book,
                new string[] { "Intro C#", "S.Nakov", "12763892", "http://www.introprogramming.info" });
            catalog.Add(item1);
            IContent item2 = new ContentItem(ContentType.Book,
                new string[] { "Intro C#", "B.Nakov", "12763892", "http://www.introprogramming.info" });
            catalog.Add(item2);
            IContent item3 = new ContentItem(ContentType.Song,
                new string[] { "Song C#", "Muncho", "12762", "http://www.mp3.info" });
            catalog.Add(item3);
            var foundContent = catalog.GetListContent("Intro C#", 1);
            StringBuilder actual = new StringBuilder();
            foreach (IContent content in foundContent)
            {
                actual.AppendLine(content.ToString());
            }
            StringBuilder expected = new StringBuilder();
            expected.AppendLine(item2.ToString());

            Assert.AreEqual(expected.ToString(), actual.ToString());
        }

        [TestMethod]
        public void TestUpdateZeroItems()
        {
            Catalog catalog = new Catalog();
            IContent item1 = new ContentItem(ContentType.Book,
                new string[] { "Intro C#", "S.Nakov", "12763892", "http://www.introprogramming.info" });
            catalog.Add(item1);
            IContent item2 = new ContentItem(ContentType.Book,
                new string[] { "Intro C#", "B.Nakov", "12763892", "http://www.introprogramming.info" });
            catalog.Add(item2);
            IContent item3 = new ContentItem(ContentType.Song,
                new string[] { "Song C#", "Muncho", "12762", "http://www.mp3.info" });
            catalog.Add(item3);

            int updatedElements = catalog.UpdateContent("ftp://www.introprogramming.info", "https://www.introprogramming.com");

            Assert.AreEqual(0, updatedElements);
        }

        [TestMethod]
        public void TestUpdateTwoItems()
        {
            Catalog catalog = new Catalog();
            IContent item1 = new ContentItem(ContentType.Book,
                new string[] { "Intro C#", "S.Nakov", "12763892", "http://www.introprogramming.info" });
            catalog.Add(item1);
            IContent item2 = new ContentItem(ContentType.Book,
                new string[] { "Intro C#", "B.Nakov", "12763892", "http://www.introprogramming.info" });
            catalog.Add(item2);
            IContent item3 = new ContentItem(ContentType.Song,
                new string[] { "Song C#", "Muncho", "12762", "http://www.mp3.info" });
            catalog.Add(item3);

            int updatedElements = catalog.UpdateContent("http://www.introprogramming.info", "https://www.introprogramming.com");

            var foundContent = catalog.GetListContent("Intro C#", 5);
            StringBuilder actual = new StringBuilder();
            foreach (IContent content in foundContent)
            {
                actual.AppendLine(content.ToString());
            }

            StringBuilder expected = new StringBuilder();
            IContent expectedItem1 = new ContentItem(ContentType.Book,
                new string[] { "Intro C#", "B.Nakov", "12763892", "https://www.introprogramming.com" });
            IContent expectedItem2 = new ContentItem(ContentType.Book,
                new string[] { "Intro C#", "S.Nakov", "12763892", "https://www.introprogramming.com" });
            expected.AppendLine(expectedItem1.ToString());
            expected.AppendLine(expectedItem2.ToString());

            Assert.AreEqual(2, updatedElements);
            Assert.AreEqual(expected.ToString(), actual.ToString());
        }
    }
}