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xunit Logging


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MartinCostello.Logging.XUnit provides extensions to hook into the ILogger infrastructure to output logs from your xunit tests to the test output.

ℹ️ This library is designed for the Microsoft logging implementation of ILoggerFactory. For other logging implementations, such as Serilog, consider using packages such as Serilog.Sinks.XUnit instead.


To install the library from NuGet using the .NET SDK run:

dotnet add package MartinCostello.Logging.XUnit


using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Xunit;
using Xunit.Abstractions;

namespace MyApp.Calculator;

public class CalculatorTests(ITestOutputHelper outputHelper)
    public void Calculator_Sums_Two_Integers()
        // Arrange
        using var serviceProvider = new ServiceCollection()
            .AddLogging((builder) => builder.AddXUnit(outputHelper))

        var calculator = services.GetRequiredService<Calculator>();

        // Act
        int actual = calculator.Sum(1, 2);

        // Assert
        Assert.AreEqual(3, actual);

public sealed class Calculator(ILogger<Calculator> logger)
    public int Sum(int x, int y)
        int sum = x + y;

        logger.LogInformation("The sum of {x} and {y} is {sum}.", x, y, sum);

        return sum;

See below for links to more examples:

  1. Unit tests
  2. Integration tests for an ASP.NET Core HTTP application


Any feedback or issues can be added to the issues for this project in GitHub.


The repository is hosted in GitHub:


This project is licensed under the Apache 2.0 license.

Building and Testing

Compiling the library yourself requires Git and the .NET SDK to be installed (version 8.0.100 or later).

To build and test the library locally from a terminal/command-line, run one of the following set of commands:

git clone
cd xunit-logging