如何将单元测试与集成测试分开？

I am new to testing and mocking. I'm trying to test a business logic class which performs calculations, calls into the DAL and updates the database, and manages transactions. I'm using mocks to do unit testing, but how does full integration testing fit into all of this. Do I basically have the exact same tests, but use the real DAL or do I do something completely different?I am new to testing and mocking. I'm trying to