Should I Unit Test Data Access Layer? Is this a good practice and how to do it?

There's no right answer to this, it really depends. Some people (e. G Roy Osherove ) say you should only test code which has conditional logic (IF statements etc), which may or may not include your DAL.

Some people (often those doing TDD) will say you should test everything, including the DAL, and aim for 100% code coverage.

It is a good practice to write unit test for every layer, even the DAL.

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