将IWrapTestMethod属性应用于整个fixture?

IWrapTestMethod 属性:

public class OutputElapsedTimeAttribute : Attribute, IWrapTestMethod
{
    public TestCommand Wrap(TestCommand command)
    {
        return new OutputElapsedTimeCommand(command);
    }
}

以及相应的before和aftertest命令:

public class OutputElapsedTimeCommand : BeforeAndAfterTestCommand
{
    private Stopwatch _sw;

    public OutputElapsedTimeCommand(TestCommand innerCommand) : base(innerCommand)
    {
        BeforeTest = ctx => { _sw = Stopwatch.StartNew(); };
        AfterTest = ctx =>
        {
            _sw.Stop();
            ctx.OutWriter.WriteLineAsync($"Took: {_sw.ElapsedMilliseconds}ms");
        };
    }
}

当我将属性应用到测试方法时,命令被正确地调用和执行。我希望能够将该属性放到测试夹具上,并将其自动应用于测试夹具中的所有测试。怎么做?我在文件里找不到合适的。