Implementing a TextReader to extract various files contents using IFilter

using System;
using System.Text;
using Eclipse.IndexingService;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.IO;

namespace IFilterTest
{
    
    
    /// <summary>
    ///This is a test class for FilterReaderTest and is intended
    ///to contain all FilterReaderTest Unit Tests
    ///</summary>
    [TestClass()]
    public class FilterReaderTest
    {
        private TestContext testContextInstance;
        private byte[] pdf;
        private byte[] doc;
        private byte[] docx;
        private byte[] htm; //gb2312


        /// <summary>
        ///Gets or sets the test context which provides
        ///information about and functionality for the current test run.
        ///</summary>
        public TestContext TestContext
        {
            get
            {
                return testContextInstance;
            }
            set
            {
                testContextInstance = value;
            }
        }

        #region Additional test attributes
        // 
        //You can use the following additional attributes as you write your tests:
        //
        //Use ClassInitialize to run code before running the first test in the class
        //[ClassInitialize()]
        //public static void MyClassInitialize(TestContext testContext)
        //{
        //}
        //
        //Use ClassCleanup to run code after all tests in a class have run
        [ClassCleanup()]
        public static void MyClassCleanup()
        {
            FilterLoader.ReleaseClassCache();
        }
        //
        //Use TestInitialize to run code before running each test
        [TestInitialize()]
        public void MyTestInitialize()
        {
            pdf = Properties.Resources.This_is_a_simple_text_pdf;
            doc = Properties.Resources.This_is_a_simple_text_doc;
            docx = Properties.Resources.This_is_a_simple_text_docx;
            htm = Properties.Resources.This_is_a_simple_text_htm;


        }
        //
        //Use TestCleanup to run code after each test has run
        //[TestCleanup()]
        //public void MyTestCleanup()
        //{
        //}
        //
        #endregion




        /// <summary>
        ///A test for ReadToEnd
        ///</summary>
        [TestMethod()]
        public void ReadToEndTest()
        {
#if DEBUG
            var fileName = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), Guid.NewGuid() + ".txt");
#else
            var fileName = Path.Combine(TestContext.TestDeploymentDir, Guid.NewGuid() + ".txt");
#endif

            var tmpStr = new StringBuilder();
            var random = new Random();
            for (int i = 0; i < 100000; i++)
            {
                var c = (char) random.Next(0, 127);
                tmpStr.Append(c);
            }
            var expected = tmpStr.ToString();
            File.WriteAllText(fileName, expected, Encoding.UTF8);
            using (var target = new FilterReader(fileName, 0x10000))
            {
                target.Init();
                var actual = target.ReadToEnd();
                Assert.AreEqual(expected, actual);
            }
            File.Delete(fileName);
        }

        /// <summary>
        ///A test for FilterReader Constructor
        ///</summary>
        [TestMethod()]
        public void FilterReaderConstructorTest5()
        {
            var target = new FilterReader(doc, ".doc", 0x50);
            target.Init();
            var actual = target.ReadToEnd();
            var expected = " This is a simple text\r\n\r\nIFilter is wonderful\r\n";
            Assert.AreEqual(expected, actual);
            target = new FilterReader(pdf, ".pdf", 0x2);
            target.Init();
            actual = target.ReadToEnd();
            expected = "\r\nThis is a simple text IFilter is wonderful ";
            Assert.AreEqual(expected, actual);
            target = new FilterReader(htm, ".htm", 0x50);
            target.Init();
            actual = target.ReadToEnd();
            Assert.IsTrue(actual.IndexOf("This is a simple text") != -1);
            Assert.IsTrue(actual.IndexOf("IFilter  is wonderful") != -1);
        }

        /// <summary>
        ///A test for FilterReader Constructor
        ///</summary>
        [TestMethod()]
        public void FilterReaderConstructorTest4()
        {
            var target = new FilterReader(doc, ".doc");
            target.Init();
            var actual =target.ReadToEnd();
            Assert.IsFalse(string.IsNullOrEmpty(actual));
        }

        /// <summary>
        ///A test for FilterReader Constructor
        ///</summary>
        [TestMethod()]
        public void FilterReaderConstructorTest3()
        {
            var target = new FilterReader(htm, 0x100);
            target.Init();
            var actual = target.ReadToEnd();
            Assert.IsFalse(string.IsNullOrEmpty(actual));
        }


        /// <summary>
        ///A test for FilterReader Constructor
        ///</summary>
        [TestMethod()]
        public void FilterReaderConstructorTest()
        {
            var target = new FilterReader(htm);
            target.Init();
            var actual = target.ReadToEnd();
            Assert.IsFalse(string.IsNullOrEmpty(actual));
        }
    }
}