added reproduction for akkadotnet#7255

src/core/Akka.API.Tests/LogFormatSpec.cs

@@ -0,0 +1,81 @@
+// -----------------------------------------------------------------------
+//  <copyright file="LogFormatSpec.cs" company="Akka.NET Project">
+//      Copyright (C) 2009-2024 Lightbend Inc. <http://www.lightbend.com>
+//      Copyright (C) 2013-2024 .NET Foundation <https://github.com/akkadotnet/akka.net>
+//  </copyright>
+// -----------------------------------------------------------------------
+
+using System;
+using System.IO;
+using Akka.Event;
+using FluentAssertions;
+using VerifyXunit;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace Akka.API.Tests;
+
+/// <summary>
+/// Regression test for https://github.com/akkadotnet/akka.net/issues/7255
+///
+/// Need to assert that the default log format is still working as expected.
+/// </summary>
+public sealed class DefaultLogFormatSpec : TestKit.Xunit2.TestKit
+{
+    public DefaultLogFormatSpec() : base("akka.loglevel = DEBUG")
+    {
+    }
+
+    public class OutputRedirector : IDisposable
+    {
+        private readonly TextWriter _originalOutput;
+        private readonly StreamWriter _writer;
+
+        public OutputRedirector(string filePath)
+        {
+            _originalOutput = Console.Out;
+            _writer = new StreamWriter(filePath)
+            {
+                AutoFlush = true
+            };
+            Console.SetOut(_writer);
+        }
+
+        public void Dispose()
+        {
+            Console.SetOut(_originalOutput);
+            _writer.Dispose();
+        }
+    }
+
+    [Fact]
+    public void ShouldUseDefaultLogFormat()
+    {
+        // arrange
+        var filePath = Path.GetTempFileName();
+
+        // act
+        using (new OutputRedirector(filePath))
+        {
+            Sys.Log.Debug("This is a test {0} {1}", 1, "cheese");
+            Sys.Log.Info("This is a test {0}", 1);
+            Sys.Log.Warning("This is a test {0}", 1);
+            Sys.Log.Error("This is a test {0}", 1);
+
+            try
+            {
+                throw new Exception("boom!");
+            }
+            catch (Exception ex)
+            {
+                Sys.Log.Debug(ex, "This is a test {0} {1}", 1, "cheese");
+                Sys.Log.Info(ex, "This is a test {0}", 1);
+                Sys.Log.Warning(ex, "This is a test {0}", 1);
+                Sys.Log.Error(ex, "This is a test {0}", 1);
+            }
+        }
+
+        // assert
+        Verifier.VerifyFile(filePath);
+    }
+}