Fix InvalidCastException in WebEx.JsonDecode

Mono's JsonValue implementation does do conversions for their implicit
casts to string, unlike the operators for numbers.

Fixes #39

src/Xamarin.Auth/AssemblyInfo.cs

@@ -40,3 +40,4 @@
 //[assembly: AssemblyDelaySign(false)]
 //[assembly: AssemblyKeyFile("")]
 
+[assembly: InternalsVisibleTo ("XamarinAuthiOSTest")]

src/Xamarin.Auth/WebEx.cs

@@ -98,7 +98,10 @@ public static Dictionary<string, string> JsonDecode (string encodedString)
 			foreach (var kv in json) {
 				var v = kv.Value as JsonValue;
 				if (v != null) {
-					inputs [kv.Key] = (string)v;
+					if (v.JsonType != JsonType.String)
+						inputs[kv.Key] = v.ToString();
+					else
+						inputs[kv.Key] = (string)v;
 				}
 			}
 

tests/Xamarin.Auth.iOS.Test/WebExTests.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using NUnit.Framework;
+using Xamarin.Utilities;
+
+namespace Xamarin.Auth.Test
+{
+	[TestFixture]
+	public class WebExTests
+	{
+		[TestCase ("{\"string\": \"value\"}","string", "value")]
+		[TestCase ("{\"int\": 5000}", "int", "5000")]
+		[TestCase ("{\"bool\": true }", "bool", "true")]
+		public void JsonDecode (string json, string arg, string value)
+		{
+			var dict = WebEx.JsonDecode (json);
+			string v;
+			Assert.That (dict.TryGetValue (arg, out v), Is.True, "Dictionary did not contain argument '" + arg + "'");
+			Assert.That (v, Is.EqualTo (value));
+		}
+	}
+}

tests/Xamarin.Auth.iOS.Test/Xamarin.Auth.iOS.Test.csproj

@@ -92,6 +92,7 @@
     <Compile Include="OAuth1Test.cs" />
     <Compile Include="AccountTest.cs" />
     <Compile Include="RequestTest.cs" />
+    <Compile Include="WebExTests.cs" />
     <Compile Include="WebUtilitiesTest.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\iOS\Xamarin.MonoTouch.CSharp.targets" />