What is the main benefit of an automated test suite?
Options
- It makes the application run faster in production
- It catches regressions in minutes, before users do (Correct option)
- It replaces the need for code reviews entirely
- It writes the documentation automatically for you
Answer
It catches regressions: when a change breaks something that used to work, you find out in minutes, not from users
Why
Without tests, every change risks breaking something elsewhere, and you only find out in production.
With a good test suite, CI runs all tests on every change; a broken behavior fails a test right away. That makes refactoring and adding features much safer and faster.
Tests also document how code is supposed to behave.
Remember
Tests = safety net against regressions.