ProgressTraceListener The ProgressTraceListener class allows directing tracing or debugging output to . To activate, place the following snippet into the one-time set-up method of either a test's fixture or the set-up fixture of a project: System.Trace.Listeners.Add(new ProgressTraceListener()); Make sure to only add a listener once, e.g.: if (!System.Trace.Listeners.OfType<ProgressTraceListener>().Any()) System.Trace.Listeners.Add(new ProgressTraceListener()); Alternatively, add it in the one-time set-up and again remove it in the one-time tear-down, e.g.: _progressTraceListener = new ProgressTraceListener(); System.Trace.Listeners.Add(_progressTraceListener); System.Trace.Listeners.Remove(_progressTraceListener); _progressTraceListener.Close();