If you really want to write messages in the Output panel in Visual Studio when running TestDriven.NET, you can use Gallio.Framework.DiagnosticLog:
DiagnosticLog.WriteLine("Test message");
However, the log messages will not be associated with the tests and will be displayed as a separate section of the Gallio report. Therefore, in most cases, you are better off using Gallio.Framework.TestLogor System.Consoleand clicking the Test Report link to see the results mentioned by Graham.
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