Update SDK to preview7 (#12682)

- react to SDK changes (Microsoft.NETCore.App.Ref assemblies grouping)
- update `dotnet new -u` logic

Author: John Luo

global.json

@@ -1,9 +1,9 @@
 {
   "sdk": {
-    "version": "3.0.100-preview6-012264"
+    "version": "3.0.100-preview7-012821"
   },
   "tools": {
-    "dotnet": "3.0.100-preview6-012264",
+    "dotnet": "3.0.100-preview7-012821",
     "runtimes": {
       "dotnet/x64": [
         "$(MicrosoftNETCoreAppRuntimeVersion)"

src/Framework/ref/Microsoft.AspNetCore.App.Ref.csproj

@@ -108,7 +108,7 @@ This package is an internal implementation of the .NET Core SDK and is not meant
           Include="@(ReferencePathWithRefAssemblies)"
           Exclude="
             @(_SelectedExtensionsRefAssemblies);
-            @(ReferencePathWithRefAssemblies->WithMetadataValue('NuGetPackageId', 'Microsoft.NETCore.App'));
+            @(ReferencePathWithRefAssemblies->WithMetadataValue('NuGetPackageId', 'Microsoft.NETCore.App.Ref'));
             @(ReferencePathWithRefAssemblies->WithMetadataValue('ReferenceGrouping', 'Microsoft.NETCore.App'));" />
 
       <AspNetCoreReferenceAssemblyPath

src/ProjectTemplates/test/Helpers/TemplatePackageInstaller.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Diagnostics;
 using System.IO;
 using System.Linq;
 using System.Reflection;
@@ -30,10 +31,10 @@ internal static class TemplatePackageInstaller
             "Microsoft.DotNet.Web.ProjectTemplates.2.1",
             "Microsoft.DotNet.Web.ProjectTemplates.2.2",
             "Microsoft.DotNet.Web.ProjectTemplates.3.0",
-            "Microsoft.DotNet.Web.Spa.ProjectTemplates",
             "Microsoft.DotNet.Web.Spa.ProjectTemplates.2.1",
             "Microsoft.DotNet.Web.Spa.ProjectTemplates.2.2",
-            "Microsoft.DotNet.Web.Spa.ProjectTemplates.3.0"
+            "Microsoft.DotNet.Web.Spa.ProjectTemplates.3.0",
+            "Microsoft.DotNet.Web.Spa.ProjectTemplates"
         };
 
         public static string CustomHivePath { get; } = typeof(TemplatePackageInstaller)
@@ -85,13 +86,38 @@ private static async Task InstallTemplatePackages(ITestOutputHelper output)
 
             Assert.Equal(4, builtPackages.Length);
 
+            /*
+             * The templates are indexed by path, for example:
+              &USERPROFILE%\.templateengine\dotnetcli\v3.0.100-preview7-012821\packages\nunit3.dotnetnew.template.1.6.1.nupkg
+                Templates:
+                    NUnit 3 Test Project (nunit) C#
+                    NUnit 3 Test Item (nunit-test) C#
+                    NUnit 3 Test Project (nunit) F#
+                    NUnit 3 Test Item (nunit-test) F#
+                    NUnit 3 Test Project (nunit) VB
+                    NUnit 3 Test Item (nunit-test) VB
+                Uninstall Command:
+                    dotnet new -u &USERPROFILE%\.templateengine\dotnetcli\v3.0.100-preview7-012821\packages\nunit3.dotnetnew.template.1.6.1.nupkg
+
+             * We don't want to construct this path so we'll rely on dotnet new --uninstall --help to construct the uninstall command.
+             */
+            var proc = await RunDotNetNew(output, "--uninstall --help");
+            var lines = proc.Output.Split(Environment.NewLine);
+
             // Remove any previous or prebundled version of the template packages
             foreach (var packageName in _templatePackages)
             {
-                // We don't need this command to succeed, because we'll verify next that
-                // uninstallation had the desired effect. This command is expected to fail
-                // in the case where the package wasn't previously installed.
-                await RunDotNetNew(output, $"--uninstall {packageName}");
+                // Depending on the ordering, there may be multiple matches:
+                // Microsoft.DotNet.Web.Spa.ProjectTemplates.3.0.3.0.0-preview7.*.nupkg
+                // Microsoft.DotNet.Web.Spa.ProjectTemplates.3.0.0-preview7.*.nupkg
+                // Error on the side of caution and uninstall all of them
+                foreach (var command in lines.Where(l => l.Contains("dotnet new") && l.Contains(packageName, StringComparison.OrdinalIgnoreCase)))
+                {
+                    var uninstallCommand = command.TrimStart();
+                    Debug.Assert(uninstallCommand.StartsWith("dotnet new"));
+                    uninstallCommand = uninstallCommand.Substring("dotnet new".Length);
+                    await RunDotNetNew(output, uninstallCommand);
+                }
             }
 
             await VerifyCannotFindTemplateAsync(output, "web");
@@ -132,7 +158,7 @@ private static async Task VerifyCannotFindTemplateAsync(ITestOutputHelper output
             {
                 var proc = await RunDotNetNew(output, $"\"{templateName}\"");
 
-                if (!proc.Error.Contains($"No templates matched the input template name: {templateName}."))
+                if (!proc.Output.Contains("Couldn't find an installed template that matches the input, searching online for one that does..."))
                 {
                     throw new InvalidOperationException($"Failed to uninstall previous templates. The template '{templateName}' could still be found.");
                 }