What is the purpose of unit tests?

Related questions

1. What is NUnit framework?
2. What is Ploeh Autofixture?
3. What is a test case in QA?
4. What means UOM?
5. What is @test in JUnit?
6. What makes a unit test good?
7. What is a good test case?
8. Is unit testing overrated?
9. What is Nsubstitute?
10. What is NUnit used for?

Tags

1. #isolates
2. #individual
3. #software
4. #testing
5. #parts
6. #smallest
7. #piece
8. #program
9. #correctly
10. #determines
11. #segregate
12. #testable
13. #working
14. #whether
15. #expect
16. #behaves
17. #exactly
18. #remainder