Add E2E tests for MonoSanity sample

samples/MonoSanity/wwwroot/index.html

@@ -12,7 +12,7 @@
     <form id="addNumbers">
       <input id="addNumberA" value="123" /> +
       <input id="addNumberB" value="456" /> =
-      <input id="addNumberResult" readonly />
+      <input id="addNumbersResult" readonly />
       <button type="submit" disabled>Go</button>
     </form>
   </fieldset>
@@ -53,7 +53,7 @@
       var a = parseInt(el('addNumberA').value);
       var b = parseInt(el('addNumberB').value);
       var result = invokeMonoMethod('MonoSanityClient', 'MonoSanityClient', 'Examples', 'AddNumbers', [a, b]);
-      el('addNumberResult').value = result;
+      el('addNumbersResult').value = result;
     }
 
     el('repeatString').onsubmit = function (evt) {

test/Microsoft.Blazor.E2ETest/Infrastructure/AspNetServerFixture.cs

@@ -10,7 +10,7 @@ namespace Microsoft.Blazor.E2ETest.Infrastructure
 {
     public class AspNetServerFixture : ServerFixture
     {
-        public string StartAndGetUrl(Type startupType)
+        public void Start(Type startupType)
         {
             var sampleSitePath = Path.Combine(
                 FindSolutionDir(),
@@ -23,7 +23,7 @@ namespace Microsoft.Blazor.E2ETest.Infrastructure
                 .UseUrls("http://127.0.0.1:0")
                 .Build();
 
-            return StartAndGetUrl(host);
+            Start(host);
         }
     }
 }

test/Microsoft.Blazor.E2ETest/Infrastructure/AspNetSiteTestBase.cs

@@ -20,13 +20,27 @@ namespace Microsoft.Blazor.E2ETest.Infrastructure
         {
             Browser = browserFixture.Browser;
 
-            var serverRootUriString = serverFixture.StartAndGetUrl(typeof(TStartup));
+            if (!serverFixture.IsStarted)
-            _serverRootUri = new Uri(serverRootUriString);
+            {
+                serverFixture.Start(typeof(TStartup));
+            }
+
+            _serverRootUri = serverFixture.RootUri;
         }
 
-        public void Navigate(string relativeUrl)
+        public void Navigate(string relativeUrl, bool noReload = false)
         {
             var absoluteUrl = new Uri(_serverRootUri, relativeUrl);
+
+            if (noReload)
+            {
+                var existingUrl = Browser.Url;
+                if (string.Equals(existingUrl, absoluteUrl.AbsoluteUri, StringComparison.Ordinal))
+                {
+                    return;
+                }
+            }
+
             Browser.Navigate().GoToUrl(absoluteUrl);
         }
     }

test/Microsoft.Blazor.E2ETest/Infrastructure/ServerFixture.cs

@@ -12,6 +12,9 @@ namespace Microsoft.Blazor.E2ETest.Infrastructure
 {
     public abstract class ServerFixture : IDisposable
     {
+        public bool IsStarted => RootUri != null;
+        public Uri RootUri { get; private set; }
+
         private IWebHost _host;
 
         public void Dispose()
@@ -19,10 +22,15 @@ namespace Microsoft.Blazor.E2ETest.Infrastructure
             _host.StopAsync();
         }
 
-        protected string StartAndGetUrl(IWebHost host)
+        protected void Start(IWebHost host)
         {
-            _host = host;
+            if (_host != null)
-            return StartWebHostInBackgroundThread();
+            {
+                throw new InvalidOperationException("Server is already started.");
+            }
+
+            _host = host ?? throw new ArgumentNullException(nameof(host));
+            RootUri = new Uri(StartWebHostInBackgroundThread());
         }
 
         protected static string FindSolutionDir()

test/Microsoft.Blazor.E2ETest/Infrastructure/StaticServerFixture.cs

@@ -1,6 +1,7 @@
 // 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.Builder;
 using Microsoft.AspNetCore.Hosting;
@@ -9,7 +10,7 @@ namespace Microsoft.Blazor.E2ETest.Infrastructure
 {
     public class StaticServerFixture : ServerFixture
     {
-        public string StartAndGetUrl(string sampleSiteName)
+        public void Start(string sampleSiteName)
         {
             var sampleSitePath = Path.Combine(
                 FindSolutionDir(),
@@ -24,7 +25,7 @@ namespace Microsoft.Blazor.E2ETest.Infrastructure
                 .UseUrls("http://127.0.0.1:0")
                 .Build();
 
-            return StartAndGetUrl(host);
+            Start(host);
         }
 
         private class Startup

test/Microsoft.Blazor.E2ETest/Infrastructure/StaticSiteTestBase.cs

@@ -22,9 +22,12 @@ namespace Microsoft.Blazor.E2ETest.Infrastructure
         {
             Browser = browserFixture.Browser;
 
-            // Start a static files web server for the specified directory
+            if (!serverFixture.IsStarted)
-            var serverRootUriString = serverFixture.StartAndGetUrl(sampleSiteName);
+            {
-            _serverRootUri = new Uri(serverRootUriString);
+                serverFixture.Start(sampleSiteName);
+            }
+
+            _serverRootUri = serverFixture.RootUri;
         }
 
         public void Navigate(string relativeUrl)

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

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using Microsoft.Blazor.E2ETest.Infrastructure;
+using OpenQA.Selenium;
 using Xunit;
 
 namespace Microsoft.Blazor.E2ETest.Tests
@@ -16,8 +17,45 @@ namespace Microsoft.Blazor.E2ETest.Tests
         [Fact]
         public void HasTitle()
         {
-            Navigate("/");
+            Navigate("/", noReload: true);
             Assert.Equal("Mono sanity check", Browser.Title);
         }
+
+        [Fact]
+        public void CanAddNumbers()
+        {
+            Navigate("/", noReload: true);
+
+            SetValue(Browser, "addNumberA", "1001");
+            SetValue(Browser, "addNumberB", "2002");
+            Browser.FindElement(By.CssSelector("#addNumbers button")).Click();
+
+            Assert.Equal("3003", GetValue(Browser, "addNumbersResult"));
+        }
+
+        [Fact]
+        public void CanRepeatString()
+        {
+            Navigate("/", noReload: true);
+
+            SetValue(Browser, "repeatStringStr", "Test");
+            SetValue(Browser, "repeatStringCount", "5");
+            Browser.FindElement(By.CssSelector("#repeatString button")).Click();
+
+            Assert.Equal("TestTestTestTestTest", GetValue(Browser, "repeatStringResult"));
+        }
+
+        private static string GetValue(IWebDriver webDriver, string elementId)
+        {
+            var element = webDriver.FindElement(By.Id(elementId));
+            return element.GetAttribute("value");
+        }
+
+        private static void SetValue(IWebDriver webDriver, string elementId, string value)
+        {
+            var element = webDriver.FindElement(By.Id(elementId));
+            element.Clear();
+            element.SendKeys(value);
+        }
     }
 }