Unit test added and Red

test/dotnet-new.Tests/GivenThatIWantANewCSApp.cs

@@ -0,0 +1,70 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using Microsoft.DotNet.Tools.Test.Utilities;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using Xunit;
+using FluentAssertions;
+
+namespace Microsoft.DotNet.Tests
+{
+    public class GivenThatIWantANewCSApp : TestBase
+    {
+        [Fact]
+        public void When_NewtonsoftJson_dependency_added_Then_project_restores_and_runs()
+        {
+            var rootPath = Temp.CreateDirectory().Path;
+            var projectJsonFile = Path.Combine(rootPath, "project.json");
+
+            new TestCommand("dotnet") { WorkingDirectory = rootPath }
+                .Execute("new");
+            
+            AddProjectJsonDependency(projectJsonFile, "Newtonsoft.Json", "7.0.1");
+
+            new TestCommand("dotnet") { WorkingDirectory = rootPath }
+                .Execute("restore")
+                .Should().Pass();
+
+            new TestCommand("dotnet") { WorkingDirectory = rootPath }
+                .Execute("run")
+                .Should().Pass();
+        }
+        
+        private static void AddProjectJsonDependency(string projectJsonPath, string dependencyId, string dependencyVersion)
+        {
+            var projectJsonRoot = ReadProject(projectJsonPath);
+
+            var dependenciesNode = projectJsonRoot
+                .Descendants()
+                .OfType<JProperty>()
+                .First(p => p.Name == "dependencies");
+
+            ((JObject)dependenciesNode.Value).Add(new JProperty(dependencyId, dependencyVersion));
+
+            WriteProject(projectJsonRoot, projectJsonPath);
+        }
+
+        private static JObject ReadProject(string projectJsonPath)
+        {
+            using (TextReader projectFileReader = File.OpenText(projectJsonPath))
+            {
+                var projectJsonReader = new JsonTextReader(projectFileReader);
+
+                var serializer = new JsonSerializer();
+                return serializer.Deserialize<JObject>(projectJsonReader);
+            }
+        }
+
+        private static void WriteProject(JObject projectRoot, string projectJsonPath)
+        {
+            string projectJson = JsonConvert.SerializeObject(projectRoot, Formatting.Indented);
+
+            File.WriteAllText(projectJsonPath, projectJson + Environment.NewLine);
+        }
+    }
+}

test/dotnet-new.Tests/project.json

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+{
+  "version": "1.0.0-*",
+  "dependencies": {
+    "Microsoft.NETCore.App": {
+      "type": "platform",
+      "version": "1.0.0-rc2-*"
+    },
+    "Microsoft.DotNet.Tools.Tests.Utilities": {
+      "target": "project"
+    },
+    "Newtonsoft.Json": "7.0.1",
+    "dotnet": {
+      "target": "project"
+    },
+    "xunit": "2.1.0",
+    "dotnet-test-xunit": "1.0.0-dev-140469-38"
+  },
+  "frameworks": {
+    "netcoreapp1.0": {
+      "imports": [
+        "netstandardapp1.5",
+        "dnxcore50",
+        "portable-net45+win8"
+      ]
+    }
+  },
+  "testRunner": "xunit"
+}