Hi ching ping,
At least you need MSTest compatible with .Net 4.0. MSTest comes either with VS or as a separate distribution. I spotted they mention it in their recently posted FAQ here
A colleague proposed another solution you may want to give a try. That is applicable for coded tests only where you just need the .dll to point to MSTest. So if you plug your coded test in a non-test project you can then convert it manually to .Net 3.5 compatible project and get a .dll MSTest for 3.5 should be able to run.
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