i am working for last 2 year with c#. i never do the unit testing. i just need to know what is the objective of Unit Testing. what kind of result we expect from unit testing. code quality is checked by unit testing? unit testing is the job of developer of tester. if it is job of tester then as a developer what we need to write in code as result tester can do the unit testing. what i need to extra for unit testing....do i need to maintain a separate copy of the same project for unit testing? please help me with good explanation.