Rewrote most of the library

Sources/MpcNET.Test/LibMpcTest.cs

@@ -0,0 +1,57 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace MpcNET.Test
+{
+    [TestClass]
+    public partial class LibMpcTest
+    {
+        private static MpdMock _mpdMock;
+
+        [ClassInitialize]
+        public static void Init(TestContext context)
+        {
+            _mpdMock = new MpdMock();
+            _mpdMock.Start();
+
+            Mpc = new MpcMock().Client;
+        }
+
+        [ClassCleanup]
+        public static void Cleanup()
+        {
+            _mpdMock.Dispose();
+        }
+
+        internal static Mpc Mpc { get; private set; }
+
+        private static async Task SendCommand(string command)
+        {
+            var response = await Mpc.SendAsync(new PassthroughCommand(command));
+            TestOutput.WriteLine(response);
+        }
+        private static async Task SendCommand<T>(IMpcCommand<T> command)
+        {
+            var response = await Mpc.SendAsync(command);
+            TestOutput.WriteLine(response);
+        }
+
+        private class PassthroughCommand : IMpcCommand<IList<string>>
+        {
+            public PassthroughCommand(string command)
+            {
+                Value = command;
+            }
+
+            public string Value { get; }
+
+            public IList<string> FormatResponse(IList<KeyValuePair<string, string>> response)
+            {
+                var result = response.Select(atrb => $"{atrb.Key}: {atrb.Value}").ToList();
+                return result;
+            }
+        }
+    }
+}