diff --git a/DigitalData.Auth.Tests/API/AuthHubTests.cs b/DigitalData.Auth.Tests/API/AuthHubTests.cs
new file mode 100644
index 0000000..e6ef12a
--- /dev/null
+++ b/DigitalData.Auth.Tests/API/AuthHubTests.cs
@@ -0,0 +1,128 @@
+using DigitalData.Auth.Abstractions;
+using DigitalData.Auth.Client;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using DigitalData.Auth.API.Services;
+using DigitalData.Auth.API.Services.Contracts;
+using Microsoft.Extensions.Configuration;
+
+namespace DigitalData.Auth.Tests.API;
+
+// TODO: The test checks if the services are working. Performance measurement is ignored. Update it to measure performance as well.
+[TestFixture]
+public class AuthHubTests
+{
+    private string _hubUrl;
+
+    private Func<Action<ClientParams>, ServiceProvider> Build;
+
+    private WebApplication? _app = null;
+
+    private readonly Queue<IAsyncDisposable> _disposableAsync = new();
+
+    private INotifier _notifier;
+
+    private static int AvailablePort
+    {
+        get
+        {
+            using var listener = new System.Net.Sockets.TcpListener(System.Net.IPAddress.Loopback, 0);
+            listener.Start();
+            int port = ((System.Net.IPEndPoint)listener.LocalEndpoint).Port;
+            listener.Stop();
+            return port;
+        }
+    }
+
+    [SetUp]
+    public void Setup()
+    {
+        Build = options =>
+        {
+            var provider =  new ServiceCollection()
+                    .AddAuthHubClient(options)
+                    .BuildServiceProvider();
+
+            _disposableAsync.Enqueue(provider);
+
+            return provider;
+        };
+
+        // Create and run test server
+        // Create builder and add SignalR service
+        var builder = WebApplication.CreateBuilder();
+        builder.Configuration.AddInMemoryCollection(new Dictionary<string, string?>()
+        {
+            { "Consumers", null }
+        });
+        var config = builder.Configuration;
+        builder.Services.AddSignalR();
+        builder.Services.AddAuthService(config);
+
+        // Listen AvailablePort and map hub
+        var _app = builder.Build();
+        var url = $"http://localhost:{AvailablePort}";
+        var hubRoute = "/auth-hub";
+        _hubUrl = url + hubRoute;
+        _app.Urls.Add(url);
+        _app.MapHub<Auth.API.Hubs.AuthHub>(hubRoute);
+        _app.Start();
+
+        _disposableAsync.Enqueue(_app);
+
+        // Create notifier by app services
+        _notifier = _app.Services.GetRequiredService<INotifier>();
+    }
+
+    [TearDown]
+    public async Task TearDown()
+    {
+        // Stop test server
+        if (_app is not null)
+        {
+            await _app.StopAsync();
+            Console.WriteLine("Test server stopped.");
+        }
+
+        while (_disposableAsync.Count > 0)
+            await _disposableAsync.Dequeue().DisposeAsync();
+    }
+
+    [Test]
+    public async Task ReceiveMessage_ShouldCallOnMessageReceived()
+    {
+        // Arrange
+        string rcv_name = string.Empty;
+        string rcv_value = string.Empty;
+        
+        // Receiver client
+        var provider_receiver = Build(opt =>
+        {
+            opt.Url = _hubUrl;
+            opt.Events.OnMessageReceived = (name, value, logger) =>
+            {
+                rcv_name = name;
+                rcv_value = value;
+            };
+        });
+        var client_receiver = provider_receiver.GetRequiredService<IAuthClient>();
+        await client_receiver.StartAsync();
+
+        string name = "name";
+        string value = "value";
+
+        // Act
+        await _notifier.UpdateKeyAsync(name, value);
+
+        // delay fort getting answer
+        await Task.Delay(2000);
+
+        // Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(rcv_name, Is.EqualTo(name));
+            Assert.That(rcv_value, Is.EqualTo(value));
+        });
+    }
+}
\ No newline at end of file
diff --git a/DigitalData.Auth.Tests/DigitalData.Auth.Tests.csproj b/DigitalData.Auth.Tests/DigitalData.Auth.Tests.csproj
index cb455f7..b22eaa5 100644
--- a/DigitalData.Auth.Tests/DigitalData.Auth.Tests.csproj
+++ b/DigitalData.Auth.Tests/DigitalData.Auth.Tests.csproj
@@ -9,8 +9,21 @@
     <IsTestProject>true</IsTestProject>
   </PropertyGroup>
 
+  <ItemGroup>
+    <None Remove="API\appsettings.json" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Content Include="API\appsettings.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      <ExcludeFromSingleFile>true</ExcludeFromSingleFile>
+      <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
+    </Content>
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="6.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageReference Include="NUnit" Version="3.14.0" />
     <PackageReference Include="NUnit.Analyzers" Version="3.9.0" />