Add a test case for a desktop app using Command.CreateDotnet, expecting to fail

TestAssets/TestProjects/TestAppSimple/Program.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace ConsoleApplication
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            Console.WriteLine("Hello World!");
+        }
+    }
+}

TestAssets/TestProjects/TestAppSimple/project.json

@@ -0,0 +1,12 @@
+{
+  "version": "1.0.0-*",
+  "compilationOptions": {
+    "emitEntryPoint": true
+  },
+  "dependencies": {
+    "Microsoft.NETCore.App": "1.0.0-rc2-*"
+  },
+  "frameworks": {
+    "netcoreapp1.0": { }
+  }
+}