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Asked: 2026-06-12T15:33:44+00:00

I have lagecy ASP.Net code which accesses database. There is data access layer which

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I have lagecy ASP.Net code which accesses database. There is data access layer which forms sqlcommands and executes on the database.

What is the best way to unit test the data access layer? Should we actually connect to database and execute test case or just use fakes?

Is it a good idea to use shim (described in below post)?

http://msdn.microsoft.com/en-us/library/hh549176.aspx

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  1. Editorial Team

    Assume your legacy DLL is managed, you should be able to use Fakes feature in VS2012. Fakes is really meant for doing this. A typical usage of Fakes works like:

    1. Create a new unit test project
    2. Add a reference to this legacy DLLs (e.g. Legacy.DLL). Make sure all the dependent DLLs are referenced in this unit test projects.
    3. Right click Legacy.DLL in the solution Reference folder, choose “Add Fakes Assembly”. This generates shims for types defined in Legacy.DLL.
    4. Also add a reference to your project code (Assume you want to unit test your product method)
    5. In the TestMethod1, you can start shimming method defined in Legacy.DLL and test your product code.

    You can also find useful info on http://msdn.microsoft.com/en-us/library/hh708916.aspx

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