Make E2E tests even more E2E by using ASP.NET Core apps' BuildWebHost method

samples/MonoSanity/Program.cs

@@ -3,6 +3,7 @@
 
 using Microsoft.AspNetCore;
 using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
 
 namespace MonoSanity
 {
@@ -15,6 +16,9 @@ namespace MonoSanity
 
         public static IWebHost BuildWebHost(string[] args) =>
             WebHost.CreateDefaultBuilder(args)
+                .UseConfiguration(new ConfigurationBuilder()
+                    .AddCommandLine(args)
+                    .Build())
                 .UseStartup<Startup>()
                 .Build();
     }

src/Microsoft.Blazor.DevHost/Server/Program.cs

@@ -9,16 +9,12 @@ namespace Microsoft.Blazor.DevHost.Server
 {
     internal class Program
     {
-        internal static IWebHost BuildWebHost(string[] args)
+        internal static IWebHost BuildWebHost(string[] args) =>
-        {
+            WebHost.CreateDefaultBuilder(args)
-            var configuration = new ConfigurationBuilder()
+                .UseConfiguration(new ConfigurationBuilder()
-                .AddCommandLine(args)
+                    .AddCommandLine(args)
-                .Build();
+                    .Build())
-
-            return WebHost.CreateDefaultBuilder(args)
-                .UseConfiguration(configuration)
                 .UseStartup<Startup>()
                 .Build();
-        }
     }
 }

test/Microsoft.Blazor.E2ETest/Infrastructure/ServerFixtures/AspNetSiteServerFixture.cs

@@ -1,27 +1,36 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.IO;
-using Microsoft.AspNetCore;
 using Microsoft.AspNetCore.Hosting;
 
 namespace Microsoft.Blazor.E2ETest.Infrastructure.ServerFixtures
 {
-    public class AspNetSiteServerFixture<TStartup> : WebHostServerFixture
+    public class AspNetSiteServerFixture : WebHostServerFixture
-        where TStartup: class
     {
+        public delegate IWebHost BuildWebHost(string[] args);
+
+        public BuildWebHost BuildWebHostMethod { get; set; }
+
         protected override IWebHost CreateWebHost()
         {
-            var sampleSitePath = Path.Combine(
+            if (BuildWebHostMethod == null)
-                    FindSolutionDir(),
+            {
-                    "samples",
+                throw new InvalidOperationException(
-                    typeof(TStartup).Assembly.GetName().Name);
+                    $"No value was provided for {nameof(BuildWebHostMethod)}");
+            }
 
-            return WebHost.CreateDefaultBuilder()
+            var sampleSitePath = Path.Combine(
-                .UseStartup<TStartup>()
+                FindSolutionDir(),
-                .UseContentRoot(sampleSitePath)
+                "samples",
-                .UseUrls("http://127.0.0.1:0")
+                BuildWebHostMethod.Method.DeclaringType.Assembly.GetName().Name);
-                .Build();
+
+            return BuildWebHostMethod(new[]
+            {
+                "--urls", "http://127.0.0.1:0",
+                "--contentroot", sampleSitePath
+            });
         }
     }
 }

test/Microsoft.Blazor.E2ETest/Tests/MonoSanityTest.cs

@@ -8,11 +8,12 @@ using Xunit;
 
 namespace Microsoft.Blazor.E2ETest.Tests
 {
-    public class MonoSanityTest : ServerTestBase<AspNetSiteServerFixture<MonoSanity.Startup>>
+    public class MonoSanityTest : ServerTestBase<AspNetSiteServerFixture>
     {
-        public MonoSanityTest(BrowserFixture browserFixture, AspNetSiteServerFixture<MonoSanity.Startup> serverFixture)
+        public MonoSanityTest(BrowserFixture browserFixture, AspNetSiteServerFixture serverFixture)
             : base(browserFixture, serverFixture)
         {
+            serverFixture.BuildWebHostMethod = MonoSanity.Program.BuildWebHost;
         }
 
         [Fact]