test that empty instrumentation key will not break customer applicaiton

src/ApplicationInsights.AspNet/ApplicationInsightsExtensions.cs

@@ -31,10 +31,25 @@
 
         public static void AddApplicationInsightsTelemetry(this IServiceCollection services, IConfiguration config)
         {
-            TelemetryConfiguration.Active.InstrumentationKey = config.Get("ApplicationInsights:InstrumentationKey");
+            // Do not initialize key if customer has already set it.
+            if (string.IsNullOrWhiteSpace(TelemetryConfiguration.Active.InstrumentationKey))
+            {
+                // Read from configuration
+                // Config.json will look like this:
+                //
+                //      "ApplicationInsights": {
+                //            "InstrumentationKey": "11111111-2222-3333-4444-555555555555"
+                //      }
+                var instrumentationKey = config.Get("ApplicationInsights:InstrumentationKey");
+                if (!string.IsNullOrWhiteSpace(instrumentationKey))
+                {
+                    TelemetryConfiguration.Active.InstrumentationKey = instrumentationKey;
+                }
+            }
 
             services.AddSingleton<TelemetryClient>((svcs) => {
                 TelemetryConfiguration.Active.TelemetryInitializers.Add(new WebClientIpHeaderTelemetryInitializer(svcs));
+                TelemetryConfiguration.Active.TelemetryInitializers.Add(new WebUserAgentTelemetryInitializer(svcs));
                 return new TelemetryClient();
             });
 
@@ -50,8 +65,6 @@
 
         public static HtmlString ApplicationInsightsJavaScriptSnippet(this IHtmlHelper helper, string instrumentationKey)
         {
-            //see: https://github.com/aspnet/Mvc/issues/2056
-            //var client = (TelemetryClient)helper.ViewContext.HttpContext.ApplicationServices.GetService(typeof(TelemetryClient));
             return new HtmlString(@"<script language='javascript'> 
                  var appInsights = window.appInsights || function(config){ 
                      function s(config){t[config]=function(){var i=arguments; t.queue.push(function(){ t[config].apply(t, i)})} 

test/ApplicationInsights.AspNet.Tests/ApplicationInsightsExtensionsTests.cs

@@ -0,0 +1,340 @@
+namespace Microsoft.ApplicationInsights.AspNet.Tests
+{
+    using Microsoft.ApplicationInsights.Channel;
+    using Microsoft.ApplicationInsights.Extensibility;
+    using Microsoft.AspNet.Hosting;
+    using Microsoft.AspNet.Mvc.Rendering;
+    using Microsoft.Framework.ConfigurationModel;
+    using Microsoft.Framework.DependencyInjection;
+    using Microsoft.Framework.DependencyInjection.Fallback;
+    using System;
+    using Xunit;
+    using Microsoft.AspNet.Mvc;
+    using Microsoft.AspNet.Mvc.ModelBinding;
+    using System.Collections.Generic;
+    using System.Threading.Tasks;
+    using System.IO;
+
+    public class ApplicationInsightsExtensionsTests
+    {
+        [Fact]
+        public void AddTelemetryWillNotThrowWithoutInstrumentationKey()
+        {
+            try
+            {
+                var serviceCollection = HostingServices.Create(null);
+
+                //Empty configuration that doesn't have instrumentation key
+                IConfiguration config = new Configuration();
+
+                serviceCollection.AddApplicationInsightsTelemetry(config);
+            }
+            finally
+            {
+                CleanActiveConfiguration();
+            }
+        }
+
+        [Fact]
+        public void AddTelemetryWillNotUseInstrumentationKeyFromConfig()
+        {
+            try
+            {
+                var serviceCollection = HostingServices.Create(null);
+                IConfiguration config = new Configuration()
+                    .AddJsonFile("content\\config.json");
+
+                serviceCollection.AddApplicationInsightsTelemetry(config);
+
+                Assert.Equal("11111111-2222-3333-4444-555555555555", TelemetryConfiguration.Active.InstrumentationKey);
+            }
+            finally
+            {
+                CleanActiveConfiguration();
+            }
+        }
+
+        [Fact]
+        public void AddTelemetryWillCreateTelemetryClientSingleton()
+        {
+            try
+            {
+                var serviceCollection = HostingServices.Create(null);
+                IConfiguration config = new Configuration()
+                    .AddJsonFile("content\\config.json");
+
+                serviceCollection.AddApplicationInsightsTelemetry(config);
+
+                Assert.Equal("11111111-2222-3333-4444-555555555555", TelemetryConfiguration.Active.InstrumentationKey);
+                var serviceProvider = serviceCollection.BuildServiceProvider();
+
+                var telemetryClient = serviceProvider.GetService<TelemetryClient>();
+                Assert.NotNull(telemetryClient);
+                Assert.Equal("11111111-2222-3333-4444-555555555555", telemetryClient.Context.InstrumentationKey);
+
+            }
+            finally
+            {
+                CleanActiveConfiguration();
+            }
+        }
+
+        [Fact]
+        public void JSSnippetWillNotThrowWithoutInstrumentationKey()
+        {
+            HtmlHelperMock helper = new HtmlHelperMock();
+            helper.ApplicationInsightsJavaScriptSnippet(null);
+            helper.ApplicationInsightsJavaScriptSnippet("");
+        }
+
+        [Fact]
+        public void JSSnippetUsesInstrumentationKey()
+        {
+            var key = "1236543";
+            HtmlHelperMock helper = new HtmlHelperMock();
+            var result = helper.ApplicationInsightsJavaScriptSnippet(key);
+            using (StringWriter sw = new StringWriter())
+            {
+                result.WriteTo(sw);
+                Assert.Contains(key, sw.ToString());
+            }
+        }
+
+
+        private class HtmlHelperMock : IHtmlHelper
+        {
+            public Html5DateRenderingMode Html5DateRenderingMode
+            {
+                get
+                {
+                    throw new NotImplementedException();
+                }
+
+                set
+                {
+                    throw new NotImplementedException();
+                }
+            }
+
+            public string IdAttributeDotReplacement
+            {
+                get
+                {
+                    throw new NotImplementedException();
+                }
+
+                set
+                {
+                    throw new NotImplementedException();
+                }
+            }
+
+            public IModelMetadataProvider MetadataProvider
+            {
+                get
+                {
+                    throw new NotImplementedException();
+                }
+            }
+
+            public dynamic ViewBag
+            {
+                get
+                {
+                    throw new NotImplementedException();
+                }
+            }
+
+            public ViewContext ViewContext
+            {
+                get
+                {
+                    throw new NotImplementedException();
+                }
+            }
+
+            public ViewDataDictionary ViewData
+            {
+                get
+                {
+                    throw new NotImplementedException();
+                }
+            }
+
+            public HtmlString ActionLink(string linkText, string actionName, string controllerName, string protocol, string hostname, string fragment, object routeValues, object htmlAttributes)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString AntiForgeryToken()
+            {
+                throw new NotImplementedException();
+            }
+
+            public MvcForm BeginForm(string actionName, string controllerName, object routeValues, FormMethod method, object htmlAttributes)
+            {
+                throw new NotImplementedException();
+            }
+
+            public MvcForm BeginRouteForm(string routeName, object routeValues, FormMethod method, object htmlAttributes)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString CheckBox(string name, bool? isChecked, object htmlAttributes)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString Display(string expression, string templateName, string htmlFieldName, object additionalViewData)
+            {
+                throw new NotImplementedException();
+            }
+
+            public string DisplayName(string expression)
+            {
+                throw new NotImplementedException();
+            }
+
+            public string DisplayText(string name)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString DropDownList(string name, IEnumerable<SelectListItem> selectList, string optionLabel, object htmlAttributes)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString Editor(string expression, string templateName, string htmlFieldName, object additionalViewData)
+            {
+                throw new NotImplementedException();
+            }
+
+            public string Encode(string value)
+            {
+                throw new NotImplementedException();
+            }
+
+            public string Encode(object value)
+            {
+                throw new NotImplementedException();
+            }
+
+            public void EndForm()
+            {
+                throw new NotImplementedException();
+            }
+
+            public string FormatValue(object value, string format)
+            {
+                throw new NotImplementedException();
+            }
+
+            public string GenerateIdFromName(string name)
+            {
+                throw new NotImplementedException();
+            }
+
+            public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, string name)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString Hidden(string name, object value, object htmlAttributes)
+            {
+                throw new NotImplementedException();
+            }
+
+            public string Id(string name)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString Label(string expression, string labelText, object htmlAttributes)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString ListBox(string name, IEnumerable<SelectListItem> selectList, object htmlAttributes)
+            {
+                throw new NotImplementedException();
+            }
+
+            public string Name(string name)
+            {
+                throw new NotImplementedException();
+            }
+
+            public Task<HtmlString> PartialAsync(string partialViewName, object model, ViewDataDictionary viewData)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString Password(string name, object value, object htmlAttributes)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString RadioButton(string name, object value, bool? isChecked, object htmlAttributes)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString Raw(object value)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString Raw(string value)
+            {
+                throw new NotImplementedException();
+            }
+
+            public Task RenderPartialAsync(string partialViewName, object model, ViewDataDictionary viewData)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString RouteLink(string linkText, string routeName, string protocol, string hostName, string fragment, object routeValues, object htmlAttributes)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString TextArea(string name, string value, int rows, int columns, object htmlAttributes)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString TextBox(string name, object value, string format, object htmlAttributes)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString ValidationMessage(string modelName, string message, object htmlAttributes, string tag)
+            {
+                throw new NotImplementedException();
+            }
+
+            public HtmlString ValidationSummary(bool excludePropertyErrors, string message, object htmlAttributes, string tag)
+            {
+                throw new NotImplementedException();
+            }
+
+            public string Value(string name, string format)
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        private void CleanActiveConfiguration()
+        {
+            TelemetryConfiguration.Active.InstrumentationKey = "";
+            TelemetryConfiguration.Active.ContextInitializers.Clear();
+            TelemetryConfiguration.Active.TelemetryModules.Clear();
+            TelemetryConfiguration.Active.TelemetryInitializers.Clear();
+        }
+
+
+    }
+}

test/ApplicationInsights.AspNet.Tests/content/config.json

@@ -0,0 +1,5 @@
+{
+	"ApplicationInsights": {
+		"InstrumentationKey": "11111111-2222-3333-4444-555555555555"
+	}
+}

test/ApplicationInsights.AspNet.Tests/project.json

@@ -5,7 +5,13 @@
         "xunit.runner.aspnet": "2.1.0.0-beta1-build60",
         "xunit.runner.visualstudio": "2.1.0.0-beta1-build1051",
         "Microsoft.AspNet.FeatureModel": "1.0.0-beta3",
-        "Microsoft.AspNet.Http.Extensions": "1.0.0-beta3"
+        "Microsoft.AspNet.Http.Extensions": "1.0.0-beta3",
+		"Microsoft.AspNet.Hosting": "1.0.0-beta3",
+        "Microsoft.Framework.Logging": "1.0.0-beta3",
+        "Microsoft.AspNet.Http.Extensions": "1.0.0-beta3",
+        "Microsoft.AspNet.RequestContainer": "1.0.0-beta3",
+		"Microsoft.AspNet.Mvc.Core": "6.0.0-beta3",
+		"Microsoft.Framework.ConfigurationModel.Json":  "1.0.0-beta3"
     },
     "commands": {
         "test": "xunit.runner.aspnet"