difference between testing and running code?

Question

also, whats the point of stuff like junit?

Answer 1

Level 0 There’s no difference between testing and debugging.

Level 1 The purpose of testing is to show that the software works.

Level 2 The purpose of testing is to show that the software doesn’t work.

Level 3 The purpose of testing is not to prove anything specific, but to reduce the risk of using the software.

Level 4 Testing is a mental discipline that helps all IT professionals develop higher quality software.