Added unit tests (all passing unfortunately)

UI improvements
Write mode still doesn't work

KeePass2PCL.Test.Shared/Keys/KcpKeyFileTests.cs

@@ -0,0 +1,76 @@
+using NUnit.Framework;
+using System;
+using System.IO;
+
+#if KeePassLib
+using KeePassLib.Keys;
+#else
+using KeePass2PCL.Keys;
+#endif
+
+namespace KeePass2PCL.Test.Shared.Keys
+{
+  [TestFixture ()]
+  public class KcpKeyFileTests
+  {
+    const string testCreateFile = "TestCreate.xml";
+    const string testKey = "0123456789";
+
+    const string expectedFileStart =
+      "<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n" +
+      "<KeyFile>\r\n" +
+      "\t<Meta>\r\n" +
+      "\t\t<Version>1.00</Version>\r\n" +
+      "\t</Meta>\r\n" +
+      "\t<Key>\r\n" +
+      "\t\t<Data>";
+
+    const string expectedFileEnd = "\t</Key>\r\n" +
+      "</KeyFile>\r\n";
+
+    [Test ()]
+    public void TestConstruct ()
+    {
+      var expectedKeyData = new byte[32] {
+        0xC1, 0xB1, 0x12, 0x77, 0x23, 0xB8, 0x99, 0xB8,
+        0xB9, 0x3B, 0x1B, 0xFF, 0x6C, 0xBE, 0xA1, 0x5B,
+        0x8B, 0x99, 0xAC, 0xBD, 0x99, 0x51, 0x85, 0x95,
+        0x31, 0xAA, 0x14, 0x3D, 0x95, 0xBF, 0x63, 0xFF
+      };
+
+      var fullPath = Path.Combine(Path.GetTempPath(), testCreateFile);
+      using (var fs = new FileStream(fullPath, FileMode.Create)) {
+        using (var sw = new StreamWriter(fs)) {
+          sw.Write (expectedFileStart);
+          sw.Write (testKey);
+          sw.Write (expectedFileEnd);
+        }
+      }
+
+      try {
+        var keyFile = new KcpKeyFile (fullPath);
+        var keyData = keyFile.KeyData.ReadData ();
+        Assert.That (keyData, Is.EqualTo (expectedKeyData));
+      } finally {
+        File.Delete (fullPath);
+      }
+    }
+
+    [Test ()]
+    public void TestCreate ()
+    {
+      var fullPath = Path.Combine(Path.GetTempPath(), testCreateFile);
+      File.Create(fullPath).Close();
+      KcpKeyFile.Create (fullPath, null);
+      try {
+        var fileContents = File.ReadAllText (fullPath);
+        Assert.That (fileContents.Length, Is.EqualTo (187));
+        Assert.That (fileContents, Does.StartWith (expectedFileStart));
+        Assert.That (fileContents, Does.EndWith (expectedFileEnd));
+      } finally {
+        File.Delete (fullPath);
+      }
+    }
+  }
+}
+