Writing unit script code for your complex business objects in a test-driven development environment really gets difficult, because they may have too many external dependencies (high coupling) on other objects.
It sometimes won't be possible for limited-budget projects to set up development environments appropriately and configure them for unit testing. Developers can overcome these issues by using mock test objects.
Read my full article in devX.
http://www.devx.com/DevXNet/Article/45071?trk=DXRSS_DOTNET
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