ডেভেলপাররা কেন স্বয়ংক্রিয় পরীক্ষা লিখবে?

✓ CATCH BUGS EARLY — find defects during development, before users (cheaper to fix)
✓ PREVENT REGRESSIONS — tests catch when a change breaks existing functionality
  (run them after every change → safety net)
✓ CONFIDENCE TO CHANGE — refactor and add features knowing tests will catch breakage
  (without tests, changes are scary; with tests, you change freely)
✓ DOCUMENTATION — tests show how code is meant to be used and what it should do
✓ FAST FEEDBACK — automated tests run in seconds (vs slow, error-prone manual testing)
✓ Enable CI/CD — automated tests are the foundation of automated, safe delivery