Problem: you have a method that logs a message using the Microsoft Patterns & Practices Enterprise Library Logging Block, and you would like to write an automated unit test for it in NUnit (or Team System – solution is easily adapted). Logging to a flat file doesn't work; the file is still open when you try to read it to verify that the message has been logged. Logging to the database doesn't work; it seems the log isn't written to the database immediately. And so forth. Is there an in-memory way of reading the logged message?