Added test for Json property for PocketItem

Tested that the Json property is set on the retrieved PocketItems and
that they represent a JSON object

PocketSharp.Tests/GetTests.cs

@@ -1,4 +1,6 @@
-using PocketSharp.Models;
+using Newtonsoft.Json.Linq;
+using Newtonsoft.Json.Schema;
+using PocketSharp.Models;
 using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
@@ -30,6 +32,23 @@ namespace PocketSharp.Tests
       Assert.True(item.Uri == itemDuplicate.Uri);
     }
 
+    [Fact]
+    public async Task IsItemJsonPopulated()
+    {
+      List<PocketItem> items = await client.Get();
+      string schemaJson = @"{
+                'description': 'PocketItem',
+                'type': 'object'
+                }";
+
+      JsonSchema schema = JsonSchema.Parse(schemaJson);
+      foreach (var pocketItem in items)
+      {
+        Assert.True(!string.IsNullOrWhiteSpace(pocketItem.Json));
+        var jObject = JObject.Parse(pocketItem.Json);
+        Assert.True(jObject.IsValid(schema));
+      }
+    }
 
     [Fact]
     public async Task AreFilteredItemsRetrieved()

PocketSharp.Tests/PocketSharp.Tests.csproj

@@ -45,6 +45,10 @@
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\packages\Microsoft.Bcl.Async.1.0.165\lib\net45\Microsoft.Threading.Tasks.Extensions.dll</HintPath>
     </Reference>
+    <Reference Include="Newtonsoft.Json, Version=4.5.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>..\packages\Newtonsoft.Json.5.0.8\lib\net45\Newtonsoft.Json.dll</HintPath>
+    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Net" />
     <Reference Include="System.Net.Http" />

PocketSharp.Tests/packages.config

@@ -4,5 +4,6 @@
   <package id="Microsoft.Bcl.Async" version="1.0.165" targetFramework="net45" />
   <package id="Microsoft.Bcl.Build" version="1.0.13" targetFramework="net45" />
   <package id="Microsoft.Net.Http" version="2.2.18" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="5.0.8" targetFramework="net45" />
   <package id="xunit" version="1.9.2" targetFramework="net45" />
 </packages>