How do I unit test persistence?

Question

As a novice in practicing test-driven development, I often end up in a quandary as to how to unit test persistence to a database.

I know that technically this would

Answer 1

Technically unit tests of persistance are not unit tests. They are integration tests.

With C# using mbUnit, you simply use the SqlRestoreInfo and RollBack attributes:

    [TestFixture]
    [SqlRestoreInfo(, ,]
    public class Tests
    {
      
        [SetUp]
        public void Setup()
        {
        
        }

        [Test]
        [RollBack]
        public void TEST()
        {
           //test insert. 
        }
    }

The same can be done in NUnit, except the attribute names differ slightly.

As for checking, if your query iss successful, you normally need to follow it with a second query to see if the database has been changed as you expected.