Add basic tests for SPA templates (no browser automation yet)

test/Templates.Test/Helpers/TemplatePackageInstaller.cs

@@ -10,6 +10,8 @@ namespace Templates.Test.Helpers
         {
             "Microsoft.DotNet.Web.ItemTemplates",
             "Microsoft.DotNet.Web.ProjectTemplates.2.0",
+            "Microsoft.DotNet.Web.Spa.ProjectTemplates",
+            "Microsoft.AspNetCore.SpaTemplates",
         };
 
         public static void ReinstallTemplatePackages()

test/Templates.Test/Helpers/TemplateTestBase.cs

@@ -61,6 +61,14 @@ namespace Templates.Test
             ProcessEx.Run(TemplateOutputDir, "dotnet", args).WaitForExit(assertSuccess: true);            
         }
 
+        protected void RunNpmInstall()
+        {
+            // The first time this runs on any given CI agent it may take several minutes.
+            // If the agent has NPM 5+ installed, it should be quite a lot quicker on
+            // subsequent runs because of package caching.
+            ProcessEx.Run(TemplateOutputDir, "cmd", "/c \"npm install\"").WaitForExit(assertSuccess: true);
+        }
+
         protected void AssertDirectoryExists(string path, bool shouldExist)
         {
             var fullPath = Path.Combine(TemplateOutputDir, path);

test/Templates.Test/SpaTemplateTest.cs

@@ -0,0 +1,28 @@
+using Xunit;
+
+namespace Templates.Test
+{
+    public class SpaTemplateTest : TemplateTestBase
+    {
+        [Theory]
+        [InlineData(null, "angular")]
+        [InlineData(null, "react")]
+        [InlineData(null, "reactredux")]
+        [InlineData(null, "aurelia")]
+        [InlineData(null, "knockout")]
+        [InlineData(null, "vue")]
+        // Just use 'angular' as representative for .NET 4.6.1 coverage, as
+        // the client-side code isn't affected by the .NET runtime choice
+        [InlineData("net461", "angular")]
+        public void SpaTemplate_Works(string targetFrameworkOverride, string template)
+        {
+            RunDotNetNew(template, targetFrameworkOverride);
+            RunNpmInstall();
+
+            using (var aspNetProcess = StartAspNetProcess(targetFrameworkOverride))
+            {
+                aspNetProcess.AssertOk("/");
+            }
+        }
+    }
+}