Testiranje enot preverja posamezne enote kode (funkcije, metode, razrede) v izolaciji — preveri, da vsak majhen del deluje pravilno sam zase. Testi enot so hitri, osredotočeni in tvorijo temelj dobre strategije testiranja.
Kaj je test enote
A UNIT test verifies the smallest testable piece (a function/method) in ISOLATION:
→ test ONE thing; give inputs, check the output/behavior
→ ISOLATED from dependencies (database, network, other units) — mock/stub those
→ FAST (no real I/O), focused, deterministic
