Add naive tests

SubtitlesParser.Tests/InvalidFiles_should.cs

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+using SubtitlesParser.Classes.Parsers;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+using Xunit;
+
+namespace SubtitlesParser.Tests
+{
+    public class InvalidFiles_should
+    {
+        SubParser parser = new SubParser();
+
+        [Fact]
+        public void Throw_on_parse()
+        {
+            foreach (var filePath in TestFiles.InvalidFiles)
+            {
+                var fileName = Path.GetFileName(filePath);
+                using (var fileStream = File.OpenRead(filePath))
+                {
+                    var mostLikelyFormat = parser.GetMostLikelyFormat(fileName);
+                    Assert.Throws<FormatException>(() => parser.ParseStream(fileStream, Encoding.UTF8, mostLikelyFormat));
+                }
+            }
+        }
+    }
+}

SubtitlesParser.Tests/TestFiles.cs

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+using System.IO;
+
+namespace SubtitlesParser.Tests
+{
+    public static class TestFiles
+    {
+        public static string[] ValidFiles { get; }
+        public static string[] InvalidFiles { get; }
+
+        static TestFiles()
+        {
+            ValidFiles = GetFiles(@"Content\ValidFiles");
+            InvalidFiles = GetFiles(@"Content\InvalidFiles");
+        }
+
+        private static string[] GetFiles(string relativePath) =>
+            Directory.GetFiles(Path.GetFullPath(relativePath));
+
+    }
+}

SubtitlesParser.Tests/ValidFiles_should.cs

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+using SubtitlesParser.Classes.Parsers;
+using System.IO;
+using System.Text;
+using Xunit;
+
+namespace SubtitlesParser.Tests
+{
+    public class ValidFiles_should
+    {
+        SubParser parser = new SubParser();
+
+        [Fact]
+        public void Parse_successfully()
+        {
+            foreach(var filePath in TestFiles.ValidFiles)
+            {
+                var fileName = Path.GetFileName(filePath);
+                using (var fileStream = File.OpenRead(filePath))
+                {
+                    var mostLikelyFormat = parser.GetMostLikelyFormat(fileName);
+                    _ = parser.ParseStream(fileStream, Encoding.UTF8, mostLikelyFormat);
+                }
+            }
+        }
+    }
+}