diff --git a/src/Cnblogs.Architecture.Ddd.Cqrs.DependencyInjection.EventBus.Dapr/DaprEventBusServiceCollectionExtensions.cs b/src/Cnblogs.Architecture.Ddd.Cqrs.DependencyInjection.EventBus.Dapr/DaprEventBusServiceCollectionExtensions.cs
index a370748..f245f9d 100644
--- a/src/Cnblogs.Architecture.Ddd.Cqrs.DependencyInjection.EventBus.Dapr/DaprEventBusServiceCollectionExtensions.cs
+++ b/src/Cnblogs.Architecture.Ddd.Cqrs.DependencyInjection.EventBus.Dapr/DaprEventBusServiceCollectionExtensions.cs
@@ -1,6 +1,9 @@
-using Cnblogs.Architecture.Ddd.EventBus.Abstractions;
+using Cnblogs.Architecture.Ddd.Cqrs.DependencyInjection.EventBus.Dapr;
+using Cnblogs.Architecture.Ddd.EventBus.Abstractions;
 using Cnblogs.Architecture.Ddd.EventBus.Dapr;
 using Dapr.Client;
+using MediatR;
+using System.Reflection;
 
 namespace Microsoft.Extensions.DependencyInjection;
 
@@ -10,16 +13,28 @@ namespace Microsoft.Extensions.DependencyInjection;
 public static class DaprEventBusServiceCollectionExtensions
 {
     /// <summary>
-    ///      Register <see cref="DaprClient"/> and <see cref="IEventBus"/>.
+    /// Register <see cref="DaprClient"/> and <see cref="IEventBus"/>.
+    /// The alternative is using services.AddCqrs().AddDaprEventBus() in <see cref="CqrsInjectorExtensions"/>.
     /// </summary>
     /// <param name="services"><see cref="IServiceCollection"/></param>
     /// <param name="appName">The app name used when publishing integration events.</param>
+    /// <param name="assemblies">Assemblies to scan by MediatR</param>
     /// <returns></returns>
-    public static IServiceCollection AddDaprEventBus(this IServiceCollection services, string appName)
+    public static IServiceCollection AddDaprEventBus(
+        this IServiceCollection services,
+        string appName,
+        params Assembly[] assemblies)
     {
         services.Configure<DaprOptions>(o => o.AppName = appName);
         services.AddControllers().AddDapr();
         services.AddScoped<IEventBus, DaprEventBus>();
+
+        if (assemblies.Length > 0)
+        {
+            services.AddMediatR(assemblies);
+        }
+
         return services;
     }
+
 }
diff --git a/test/Cnblogs.Architecture.IntegrationTestProject/Program.cs b/test/Cnblogs.Architecture.IntegrationTestProject/Program.cs
index ba8f983..5ba5c67 100644
--- a/test/Cnblogs.Architecture.IntegrationTestProject/Program.cs
+++ b/test/Cnblogs.Architecture.IntegrationTestProject/Program.cs
@@ -9,11 +9,9 @@
 
 var builder = WebApplication.CreateBuilder(args);
 
-builder.Services.AddCqrs(
-    Assembly.GetExecutingAssembly(),
-    typeof(TestIntegrationEvent).Assembly)
-    .AddDefaultDateTimeAndRandomProvider();
-builder.Services.AddDaprEventBus(Constants.AppName);
+builder.Services.AddCqrs(Assembly.GetExecutingAssembly(), typeof(TestIntegrationEvent).Assembly)
+    .AddDefaultDateTimeAndRandomProvider()
+    .AddDaprEventBus(Constants.AppName);
 builder.Services.AddControllers().AddCqrsModelBinderProvider();
 
 // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
diff --git a/test/Cnblogs.Architecture.IntegrationTests/IntegrationEventHandlerTests.cs b/test/Cnblogs.Architecture.IntegrationTests/IntegrationEventHandlerTests.cs
index 4087e33..e8b2bfe 100644
--- a/test/Cnblogs.Architecture.IntegrationTests/IntegrationEventHandlerTests.cs
+++ b/test/Cnblogs.Architecture.IntegrationTests/IntegrationEventHandlerTests.cs
@@ -1,20 +1,24 @@
 using System.Net.Http.Json;
 using Cnblogs.Architecture.IntegrationTestProject;
+using Cnblogs.Architecture.IntegrationTestProject.EventHandlers;
 using Cnblogs.Architecture.TestIntegrationEvents;
 using FluentAssertions;
+using MediatR;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc.Testing;
+using Microsoft.AspNetCore.TestHost;
+using Microsoft.Extensions.DependencyInjection;
 using Xunit.Abstractions;
 
 namespace Cnblogs.Architecture.IntegrationTests;
 
-[Collection(IntegrationTestCollection.Name)]
 public class IntegrationEventHandlerTests
 {
-    private readonly IntegrationTestFactory _factory;
     private readonly ITestOutputHelper _testOutputHelper;
 
-    public IntegrationEventHandlerTests(IntegrationTestFactory factory, ITestOutputHelper testOutputHelper)
+    public IntegrationEventHandlerTests(ITestOutputHelper testOutputHelper)
     {
-        _factory = factory;
         _testOutputHelper = testOutputHelper;
     }
 
@@ -22,7 +26,15 @@ public IntegrationEventHandlerTests(IntegrationTestFactory factory, ITestOutputH
     public async Task IntegrationEventHandler_TestIntegrationEvent_SuccessAsync()
     {
         // Arrange
-        var client = _factory.CreateClient();
+        var builder = WebApplication.CreateBuilder();
+        builder.Services
+            .AddDaprEventBus(nameof(IntegrationEventHandlerTests), typeof(TestIntegrationEventHandler).Assembly)
+            .AddHttpContextAccessor();
+        builder.WebHost.UseTestServer();
+        var app = builder.Build();
+        app.Subscribe<TestIntegrationEvent>();
+        await app.StartAsync();
+        var client = app.GetTestClient();
         var @event = new TestIntegrationEvent(Guid.NewGuid(), DateTimeOffset.Now, "Hello World!");
 
         // Act