A VS 11 DiffReporter for ApprovalTests

DevEnvDiffReporter.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ApprovalTests.Reporters
{
    public class DevEnvDiffReporter : GenericDiffReporter
    {
        public static readonly DevEnvDiffReporter INSTANCE = new DevEnvDiffReporter();

        public DevEnvDiffReporter()
            : base(
                "C:\\Program Files (x86)\\Microsoft Visual Studio 11.0\\Common7\\IDE\\devenv.exe",
                "/diff \"{0}\" \"{1}\"", 
                "Only works with VS11")
        {
        }
    }
}

DevEnvDiffReporterTest.cs

using ApprovalTests.Reporters;
using ApprovalUtilities.Utilities;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace ApprovalTests.Tests.Reporters
{
    [TestClass]
    public class DevEnvDiffReporterTest
    {
        [TestMethod]
        [UseReporter(typeof(FileLauncherReporter))]
        public void DevEnvTest()
        {
            var dir = PathUtilities.GetDirectoryForCaller();
            string a = dir + "a.txt";
            System.IO.File.WriteAllText(a, "text a");
            string b = dir + "b.txt";
            System.IO.File.WriteAllText(b, "text b");
            var args = new DevEnvDiffReporter().GetLaunchArguments(a, b);
            Approvals.VerifyWithCallback(args, launchargs => GenericDiffReporterTest.StartProcess(launchargs));
        }
    }
}