Detect if DLL is running from ASP.NET


I've got a DLL that's usually run from within ASP.NET 3.5. However, for unit testing, we need to run it without it. The tested parts can run without ASP.NET, but I would need to detect whether this is being run by nUnit or ASP.NET to initialize a few variables. How can I detect if it was invoked by ASP.NET? Also, what method would you suggest for unit testing of web app code - I want to test various internal function that are not directly exposed to the web or web services, so using a browser-like approach will not work. Thanks in advance.
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You can check HttpContext.Current. If it is null the method is not being called from a web environment.

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