Unit Test In N Tier Architecture

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I want to write tests for a program that is coded by someone else. But I have some problems while writing tests. I can't understand exactly how to fake some objects. I searched and found Unit Test for n tier architecture but It doesn't help me. For example, I want to write a test for code below (I know It is a dummy code for just clarification)

        public List<CustomerObject> FetchCustomersByName(CustomerObject obj)
        {
            DAL customerDal = new DAL();
            //Maybe other operations
            List<CustomerObject> list = customerDal.FetchByName(obj.Name);
            //Maybe other operations over list
            return list;
        }

I just want to test FetchCustomersByName but there is connection with DAL. I think creating stub class but In this case I have to change my original code. And it was coded by someone else. How can I write a test for this method?

Thanks in advance.

asked 22 secs ago

Mehmet

131

Unit Test In N Tier Architecture