Devodo.Logging.Xunit

An xUnit Microsoft.Extensions.Logging.ILoggerProvider that writes logs to the test output.

Its formatting and its configuration is based on the Microsoft.Extensions.Logging.Console.SimpleConsoleFormatter created from the ConsoleLoggerExtensions.AddSimpleConsole Method.

Installing

Install Devodo.Logging.Xunit as a NuGet package:

Install-Package Devodo.Logging.Xunit

Or via the .NET command line interface:

dotnet add package Devodo.Logging.Xunit

Usage

Given a simple ASP.NET Minimal API as follows:

var app = WebApplication.Create(args);

app.MapGet("/echo/{message}", (string message, ILogger<Program> logger) =>
{
    logger.LogInformation("Handling echo request with input: {Message}", message);
    
    return message;
});

app.Run();

The application logs can be sent to xUnit test output as follows:

public class ExampleTests
{
    private readonly ITestOutputHelper _outputHelper;

    public ExampleTests(ITestOutputHelper outputHelper)
    {
        _outputHelper = outputHelper;
    }
    
    [Fact]
    public async Task GivenHttpClient_WhenGetRoot_ThenRespondsHello()
    {
        // ARRANGE
        var httpClient = new WebApplicationFactory<Program>().WithWebHostBuilder(builder =>
        {
            builder.ConfigureLogging(logging =>
            {
                // Add an xUnit logging provider that writes to the ITestOutputHelper
                logging.AddXunit(_outputHelper);
            });
        }).CreateClient();

        // ACT
        var response = await httpClient.GetAsync("/echo/hello xunit logging");
        
        // ASSERT
        Assert.Equal("hello xunit logging", await response.Content.ReadAsStringAsync());
    }
}

The output from the test above is:

info: Program[0]
      Handling echo request with input: hello xunit logging

The following format options can be configured:

logging.AddXunit(_outputHelper, options =>
{
    options.IncludeScopes = true;
    options.TimestampFormat = "HH:mm:ss ";
    options.SingleLine = false;
    options.UseUtcTimestamp = true;
});