Added unit test for ContentStore, added object extensions and supporting classes from v5,

added RhinoMocks to the test project and httpcontext factory from v5 unit tests to be used
in our v4 ones.

src/Umbraco.Core/StringExtensions.cs

@@ -12,6 +12,7 @@ using System.Web;
 
 namespace Umbraco.Core
 {
+
     ///<summary>
     /// String extension methods
     ///</summary>
@@ -29,6 +30,50 @@ namespace Umbraco.Core
             return value.TrimEnd(forRemoving).TrimStart(forRemoving);
         }
 
+		public static string EncodeJsString(this string s)
+		{
+			var sb = new StringBuilder();
+			foreach (var c in s)
+			{
+				switch (c)
+				{
+					case '\"':
+						sb.Append("\\\"");
+						break;
+					case '\\':
+						sb.Append("\\\\");
+						break;
+					case '\b':
+						sb.Append("\\b");
+						break;
+					case '\f':
+						sb.Append("\\f");
+						break;
+					case '\n':
+						sb.Append("\\n");
+						break;
+					case '\r':
+						sb.Append("\\r");
+						break;
+					case '\t':
+						sb.Append("\\t");
+						break;
+					default:
+						int i = (int)c;
+						if (i < 32 || i > 127)
+						{
+							sb.AppendFormat("\\u{0:X04}", i);
+						}
+						else
+						{
+							sb.Append(c);
+						}
+						break;
+				}
+			}
+			return sb.ToString();
+		}
+
         public static string TrimEnd(this string value, string forRemoving)
         {
             if (string.IsNullOrEmpty(value)) return value;