This is a test solution to show some TDD examples.

IDataStorage -- is a wrapper of Linq to SQL datacontext that can be mocked in tests.

Tests.BlogEngineTests contains two 
simple tests for insert and select operations. Both tests do not require DB.

IntegrationTests.BlogEngineIntegrationTests contains the same tests that are executed against real DB. Script for test DB is located in 
Sql Scripts folder.