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This whitepaper talks about different testing scenarios with Dynamics AX 2009. It also talks about whether to go for automation or not, functional testing, unit testing, performance testing etc. A good read.

http://www.microsoft.com/downloads/details.aspx?FamilyId=EC0C1650-EF44-45E9-ADE9-57F28C39A051&displaylang=en
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