Who is responsible for writing unit test cases?

Related questions

1. What is the purpose of xUnit?
2. Is NUnit better than MsTest?
3. How do I run xUnit tests from command line?
4. Why testing should not be done by developers?
5. What is xUnit theory?
6. Why NUnit is used?
7. Does Xunit run tests in parallel?
8. What Junit 4?
9. What should we unit test?
10. What is NUnit in C#?

Tags

1. #testing
2. #integration
3. #automated
4. #responsible
5. #reasoning
6. #under
7. #purpose
8. #white
9. #should
10. #completed
11. #neccessarily
12. #client
13. #behind
14. #developer
15. #inside
16. #system
17. #application