diff --git a/test/JSSoft.Communication.Tests/CallbackTest.cs b/test/JSSoft.Communication.Tests/CallbackTest.cs
index eeb9e66..02670a5 100644
--- a/test/JSSoft.Communication.Tests/CallbackTest.cs
+++ b/test/JSSoft.Communication.Tests/CallbackTest.cs
@@ -94,20 +94,20 @@ public void Callback3_Test()
 
     public async Task InitializeAsync()
     {
-        _logger.WriteLine($"InitializeAsync 1");
         _serverToken = await _serverContext.OpenAsync(CancellationToken.None);
+        _logger.WriteLine($"Server is opened: {_serverToken}");
         _clientToken = await _clientContext.OpenAsync(CancellationToken.None);
+        _logger.WriteLine($"Client is opened: {_clientToken}");
         _server = _testServer;
-        _logger.WriteLine($"InitializeAsync 2");
     }
 
     public async Task DisposeAsync()
     {
-        _logger.WriteLine($"DisposeAsync 1");
         await _serverContext.ReleaseAsync(_serverToken);
+        _logger.WriteLine($"Server is released: {_serverToken}");
         await _clientContext.ReleaseAsync(_clientToken);
+        _logger.WriteLine($"Client is released: {_clientToken}");
         _endPoint.Dispose();
-        _logger.WriteLine($"DisposeAsync 2");
     }
 
     public class ValueEventArgs(object? value) : EventArgs
diff --git a/test/JSSoft.Communication.Tests/TestLogger.cs b/test/JSSoft.Communication.Tests/TestLogger.cs
deleted file mode 100644
index ff2e341..0000000
--- a/test/JSSoft.Communication.Tests/TestLogger.cs
+++ /dev/null
@@ -1,24 +0,0 @@
-// <copyright file="TestLogger.cs" company="JSSoft">
-//   Copyright (c) 2024 Jeesu Choi. All Rights Reserved.
-//   Licensed under the MIT License. See LICENSE.md in the project root for license information.
-// </copyright>
-
-using JSSoft.Communication.Logging;
-using Xunit.Abstractions;
-
-namespace JSSoft.Communication.Tests;
-
-public sealed class TestLogger(ITestOutputHelper logger) : ILogger
-{
-    private readonly ITestOutputHelper _logger = logger;
-
-    public void Debug(object message) => _logger.WriteLine($"{message}\n");
-
-    public void Info(object message) => _logger.WriteLine($"{message}\n");
-
-    public void Error(object message) => _logger.WriteLine($"{message}\n");
-
-    public void Warn(object message) => _logger.WriteLine($"{message}\n");
-
-    public void Fatal(object message) => _logger.WriteLine($"{message}\n");
-}