Complete Azure Application Insights integration with tests and documentation

Co-authored-by: BenjaminMichaelis <[email protected]>

Author: Copilot

EssentialCSharp.Web.Tests/ApplicationInsightsTests.cs

@@ -0,0 +1,31 @@
+using Microsoft.ApplicationInsights.Extensibility;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace EssentialCSharp.Web.Tests;
+
+public class ApplicationInsightsTests
+{
+    [Fact]
+    public void WhenTheApplicationStarts_ApplicationInsightsIsRegistered()
+    {
+        using WebApplicationFactory factory = new();
+
+        // Verify that Application Insights services are registered
+        var services = factory.Services;
+        
+        // Check if TelemetryConfiguration is registered (core Application Insights service)
+        var telemetryConfiguration = services.GetService<TelemetryConfiguration>();
+        Assert.NotNull(telemetryConfiguration);
+    }
+
+    [Fact]
+    public async Task WhenTheApplicationStarts_HealthCheckIsAvailable()
+    {
+        using WebApplicationFactory factory = new();
+
+        HttpClient client = factory.CreateClient();
+        using HttpResponseMessage response = await client.GetAsync("/healthz");
+
+        Assert.Equal(System.Net.HttpStatusCode.OK, response.StatusCode);
+    }
+}

README.md

@@ -9,7 +9,7 @@ For any bugs, questions, or anything else with specifically the code found insid
 ## What You Will Need
 
 - [Visual Studio](https://visualstudio.microsoft.com/) (or your preferred IDE)
-- [.NET 8.0 SDK](https://dotnet.microsoft.com/download)
+- [.NET 9.0 SDK](https://dotnet.microsoft.com/download)
   - If you already have .NET installed you can check the version by typing `dotnet --info` into cmd to make sure you have the right version
 
 ## Startup Steps
@@ -35,6 +35,7 @@ Authentication:github:clientSecret = anotherimportantclientsecret
 Authentication:github:clientId = anotherimportantclientid
 HCaptcha:SiteKey = captchaSiteKey
 HCaptcha:SecretKey = captchaSecretKey
+APPLICATIONINSIGHTS_CONNECTION_STRING = "InstrumentationKey=your-instrumentation-key-here;IngestionEndpoint=https://region.in.applicationinsights.azure.com/;LiveEndpoint=https://region.livediagnostics.monitor.azure.com/"
 
 Testing Secret Values:
 Some Value Secrets for Testing/Development Purposes: