Question

There s a bug/feature in Visual Studio 2010 where you can t create a unit test project with the 2.0 CLR.

https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=483891&wa=wsignin1.0

This causes all sorts of problems when the project being tested is targetting the 2.0 CLR (ASP.NET MVC 2 on top of .Net 3.5 SP1 in this case) - crashes on debug, tests failing unexpectedly, in one case the test project doesn t even build because of the dependency on System.Web 2.0.0.0 which isn t available in projects targetting 4.0.

It s not possible to change the test project to target the 3.5 framework.

Does anyone know of a workaround?

Workarounds I m aware of, but want to avoid, include:-

1) Upgrading the whole solution to target .NET 4
I want to host on Azure and it isn t clear at this point if/when support for .NET 4.0 will be added. See .NET 4.0 on Windows Azure?

2) Rolling the whole project back to Visual Studio 2008
This is a last resort as there are a number of features in 2010 that I really want to use

3) Building the unit tests in 2008 and managing the references manually
This will work, but it ll be a tremendous pain.

Any ideas?

Answer 1

It looks like Visual Studio 2010 Service Pack 1 will resolve this once it is released (see the heading Better platform support | Unit Testing on .NET 3.5 )

You can get the Beta version with a Go-Live licence now...

Answer 2

You haven t suggested changing to a different test framework. Personally, I use NUnit and have for years. It s far more sophisticated that the stuff in 2008. I haven t had time to see what s changed in 2010 but I can t see MS catching up that quickly.

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