Run components E2E tests in CI (#5158)

* Auto-install local copy of selenium-standalone on build

* Automatically start/stop selenium-standalone when running E2E tests

* Update after rebase

* Exclude node_modules from E2ETests project

* Avoid deadlocks

* Include E2E tests when running all tests in src/Components

* Be more forgiving about waiting for selenium-server to be ready

* Update usage of shared source file

Author: SteveSandersonMS

src/Components/build/repo.props

@@ -27,14 +27,6 @@
     <ProjectsToPack Include="$(RepositoryRoot)blazor\src\*\*.csproj" />
   </ItemGroup>
 
-  <!--
-    By default, this excludes the end-to-end tests from the repo-level build command.
-    The CI will script these directly by passing BlazorAllTests=true
-  -->
-  <ItemGroup Condition="'$(BlazorAllTests)'!='true'">
-    <ExcludeFromTest Include="$(RepositoryRoot)test\Microsoft.AspNetCore.Components.E2ETest\Microsoft.AspNetCore.Components.E2ETest.csproj" />
-  </ItemGroup>
-
   <ItemGroup>
     <DotNetCoreRuntime Include="$(MicrosoftNETCoreAppPackageVersion)" />
 

src/Components/test/Microsoft.AspNetCore.Components.E2ETest/Infrastructure/BrowserFixture.cs

@@ -1,4 +1,4 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// 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 OpenQA.Selenium;
@@ -38,7 +38,7 @@ public BrowserFixture()
 
             try
             {
-                var driver = new RemoteWebDriver(opts);
+                var driver = new RemoteWebDriver(SeleniumStandaloneServer.Instance.Uri, opts);
                 driver.Manage().Timeouts().ImplicitWait = TimeSpan.FromSeconds(1);
                 Browser = driver;
                 Logs = new RemoteLogs(driver);

src/Components/test/Microsoft.AspNetCore.Components.E2ETest/Infrastructure/SeleniumStandaloneServer.cs

@@ -0,0 +1,106 @@
+// 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 Microsoft.Extensions.Internal;
+using System;
+using System.Diagnostics;
+using System.Net;
+using System.Net.Http;
+using System.Net.Sockets;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Microsoft.AspNetCore.Components.E2ETest.Infrastructure
+{
+    class SeleniumStandaloneServer
+    {
+        private static object _instanceCreationLock = new object();
+        private static SeleniumStandaloneServer _instance;
+
+        public Uri Uri { get; }
+
+        public static SeleniumStandaloneServer Instance
+        {
+            get
+            {
+                lock (_instanceCreationLock)
+                {
+                    if (_instance == null)
+                    {
+                        _instance = new SeleniumStandaloneServer();
+                    }
+                }
+
+                return _instance;
+            }
+        }
+
+        private SeleniumStandaloneServer()
+        {
+            var port = FindAvailablePort();
+            Uri = new UriBuilder("http", "localhost", port, "/wd/hub").Uri;
+
+            var process = Process.Start(new ProcessStartInfo
+            {
+                FileName = "npm",
+                Arguments = $"run selenium-standalone start -- -- -port {port}",
+                UseShellExecute = true,
+            });
+
+            PollUntilProcessStarted();
+
+            AppDomain.CurrentDomain.ProcessExit += (sender, e) =>
+            {
+                if (!process.HasExited)
+                {
+                    process.KillTree(TimeSpan.FromSeconds(10));
+                    process.Dispose();
+                }
+            };
+        }
+
+        private void PollUntilProcessStarted()
+        {
+            var timeoutAt = DateTime.Now.AddSeconds(30);
+            Exception lastException = null;
+            while (true)
+            {
+                if (DateTime.Now > timeoutAt)
+                {
+                    throw new TimeoutException($"The selenium server instance did not start accepting requests at {Uri} before the timeout occurred. The last exception was: {lastException?.ToString() ?? "NULL"}");
+                }
+
+                var httpClient = new HttpClient();
+                try
+                {
+                    var timeoutAfter1Second = new CancellationTokenSource(3000);
+                    var response = httpClient.GetAsync(
+                        Uri, timeoutAfter1Second.Token).Result;
+                    response.EnsureSuccessStatusCode();
+                    return;
+                }
+                catch (Exception ex)
+                {
+                    lastException = ex;
+                }
+
+                Thread.Sleep(1000);
+            }
+        }
+
+        static int FindAvailablePort()
+        {
+            var listener = new TcpListener(IPAddress.Loopback, 0);
+
+            try
+            {
+                listener.Start();
+                return ((IPEndPoint)listener.LocalEndpoint).Port;
+            }
+            finally
+            {
+                listener.Stop();
+            }
+        }
+    }
+}

src/Components/test/Microsoft.AspNetCore.Components.E2ETest/Microsoft.AspNetCore.Components.E2ETest.csproj

@@ -3,10 +3,16 @@
   <PropertyGroup>
     <TargetFramework>netcoreapp3.0</TargetFramework>
     <IsPackable>false</IsPackable>
+    <DefaultItemExcludes>${DefaultItemExcludes};node_modules\**</DefaultItemExcludes>
     <!-- WebDriver is not strong-named signed -->
     <SignAssembly>false</SignAssembly>
   </PropertyGroup>
 
+  <Target Name="EnsureNpmRestored" BeforeTargets="Build" Condition="!Exists('node_modules')">
+    <Message Importance="high" Text="Restoring dependencies using 'npm'. This may take several minutes..." />
+    <Exec Command="npm ci" />
+  </Target>
+
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.Hosting" Version="$(AspNetCorePackageVersion)" />
     <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="$(AspNetCorePackageVersion)" />
@@ -32,4 +38,8 @@
     <ProjectReference Include="..\testapps\TestServer\TestServer.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Compile Include="..\..\..\Shared\Process\ProcessExtensions.cs" Link="Shared\ProcessExtensions.cs" />
+  </ItemGroup>
+
 </Project>