If developers do not find and fix program bugs they will deliver (share) code that is either:
- Unusable
- Does not perform as expected
The purpose of unit testing is to avoid this situation by exposing (finding) program bugs allowing developers to fix the bugs and deliver high quality code.
Smoke testing is a subset of unit testing where we focus only on #1 above (i.e., finding and fixing bugs that are causing the program to be unusable)
In the next chapter, we dive deeper into the concepts of unit testing.
Unit Testing
(Chapter 101 - Purpose of Unit Testing)