Arrange-Act-Assert (AAA) je uzorak za strukturiranje testova jasno u tri faze: Arrange (postavljanje), Act (izvršavanje radnje), Assert (provjera rezultata). Čini testove čitljivima, organiziranim i lako razumljivima.
Tri faze
ARRANGE → set up the test: create objects, prepare inputs, configure mocks, set state
ACT → perform the ACTION being tested (call the function/method under test)
ASSERT → verify the OUTCOME: check the result/behavior matches what's expected
→ A clear three-part structure for every test.
