the simplest possible bridge between xunit and microsoft's ilogger

xunit_logger.cs

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

public class XunitLogger<T> : ILogger<T>
{
    private readonly ITestOutputHelper _outputHelper;

    public XunitLogger(ITestOutputHelper outputHelper)
    {
        _outputHelper = outputHelper;
    }

    public IDisposable BeginScope<TState>(TState state) => throw new NotImplementedException();

    public bool IsEnabled(LogLevel logLevel) => true;

    public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception,
        Func<TState, Exception, string> formatter) =>
        _outputHelper.WriteLine($"[{logLevel}] {formatter.Invoke(state, exception)}");
}

How to use in a test:

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

public class Example
{
    private readonly ITestOutputHelper _testOutputHelper;

    public Example(ITestOutputHelper testOutputHelper)
    {
        _testOutputHelper = testOutputHelper;
    }

    [Fact]
    public void SomeTest()
    {
        var logger = new XunitLogger<Example>(_testOutputHelper);
        logger.LogError("some log message");
    }
}