[assembly: TestFramework("Your.Test.Project.ConfigureTestFramework", "AssemblyName")]

namespace Your.Test.Project
{
    public class ConfigureTestFramework : AutofacTestFramework
    {
        private const string TestSuffixConvention = "Tests";

        public ConfigureTestFramework(IMessageSink diagnosticMessageSink)
            : base(diagnosticMessageSink)
        {
            var builder = new ContainerBuilder();
            builder.RegisterAssemblyTypes(Assembly.GetExecutingAssembly())
                .Where(t => t.Name.EndsWith(TestSuffixConvention));

            builder.Register(context => new TestOutputHelper())
                .AsSelf()
                .As<ITestOutputHelper>()
                .InstancePerLifetimeScope();

            // configure your container
            // e.g. builder.RegisterModule<TestOverrideModule>();

            Container = builder.Build();
        }
    }
}

[UseAutofacTestFramework]
public class MyAwesomeTests
{
    public MyAwesomeTests()
    {
    }

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

    [Fact]
    public void AssertThatWeDoStuff()
    {
        _outputHelper.WriteLine("Hello");
    }

    private readonly ITestOutputHelper _outputHelper;
}