tests: setup initial infra for end to end tests

test/Blog.Tests/EndToEnd/BlogHostFactory.cs

@@ -0,0 +1,15 @@
+namespace Blog.Tests.EndToEnd;
+
+public class BlogHostFactory<TProgram> : WebApplicationFactory<TProgram> where TProgram : class
+{
+  protected override IHost CreateHost(IHostBuilder builder)
+  {
+    var testHost = base.CreateHost(builder);
+    builder.ConfigureWebHost(webHostBuilder => webHostBuilder.UseKestrel());
+    
+    var kestrelHost = builder.Build();
+    kestrelHost.Start();
+    
+    return new CompositeHost(testHost, kestrelHost);
+  }
+}