Fix tests

Missing namespace
Re-enable dotnet-nuget unit tests

src/dotnet/ICommandRunner.cs

@@ -0,0 +1,13 @@
+// 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;
+
+namespace Microsoft.DotNet.Cli
+{
+    public interface ICommandRunner 
+    { 
+        int Run(string[] commandArgs); 
+    } 
+}

src/dotnet/commands/dotnet-nuget/Program.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Linq;
+using Microsoft.DotNet.Cli;
 using Microsoft.DotNet.Cli.CommandLine;
 using Microsoft.DotNet.Cli.Utils;
 using Microsoft.DotNet.InternalAbstractions;
@@ -10,15 +11,33 @@ using Microsoft.DotNet.Tools;
 
 namespace Microsoft.DotNet.Tools.Restore
 {
-    public partial class NuGetCommand
+    public class NuGetCommand
     {
         public static int Run(string[] args)
+        {
+            return Run(args, new NuGetCommandRunner());
+        }
+
+        public static int Run(string[] args, ICommandRunner nugetCommandRunner)
         {
             DebugHelper.HandleDebugSwitch(ref args);
 
+            if (nugetCommandRunner == null)
+            {
+                throw new ArgumentNullException(nameof(nugetCommandRunner));
+            }
+
+            return nugetCommandRunner.Run(args);
+        }
+
+        private class NuGetCommandRunner : ICommandRunner
+        {
+            public int Run(string [] args)
+            {
                 var nugetApp = new NuGetForwardingApp(args);
 
                 return nugetApp.Execute();
             }
         }
+    }
 }

test/dotnet-new.Tests/GivenThatIWantANewCSxUnitProject.cs

@@ -4,6 +4,7 @@
 using Microsoft.DotNet.Tools.Test.Utilities;
 using Xunit;
 using FluentAssertions;
+using System.IO;
 
 namespace Microsoft.DotNet.Tests
 {
@@ -18,8 +19,7 @@ namespace Microsoft.DotNet.Tests
 
             new TestCommand("dotnet") { WorkingDirectory = rootPath }
                 .Execute("new --type xunittest")
-                .Should()
-                .Pass();
+                .Should().Pass();
             
             new TestCommand("dotnet") { WorkingDirectory = rootPath }
                 .Execute("restore")

test/dotnet-nuget.UnitTests/GivenANuGetCommand.cs

@@ -42,14 +42,14 @@ namespace Microsoft.DotNet.Tools.Run.Tests
         {
             // Arrange
             string[] receivedArgs = null;
-            var testCommandRunner = new Mock<INuGetCommandRunner>();
+            var testCommandRunner = new Mock<ICommandRunner>();
             testCommandRunner
                 .Setup(x => x.Run(It.IsAny<string[]>()))
                 .Callback<string[]>(s => receivedArgs = s)
                 .Returns(0);
 
             // Act
-            var returned = NuGetCommand.RunCommand(inputArgs, testCommandRunner.Object);
+            var returned = NuGetCommand.Run(inputArgs, testCommandRunner.Object);
 
             // Assert
             receivedArgs.Should().BeEquivalentTo(inputArgs);