14. Solution: Mockito Verify

Solution: Mockito Verify

ChargeServiceTest.java

@ExtendWith(MockitoExtension.class)
class ChargeServiceTest {

    private ChargeService chargeService;

    @Mock
    private ChargeUserApiHttpClient chargeUserApiHttpClient;

    @BeforeEach
    void init() {
        chargeService = new ChargeService(chargeUserApiHttpClient);
    }


    @Test
    void chargeUser() {
        chargeService.chargeUser(
            "UserId123",
            List.of(
                new TicketItem("Soda", new BigDecimal("10.0"), new BigDecimal("1.0")),    // 11.00
                new TicketItem("Soda", new BigDecimal("12.0"), new BigDecimal("1.2"))     // 13.20
            ),
            new BigDecimal("1.50"),                                                       //+ 1.50
            new BigDecimal("0.25")                                                        //- 0.25
        );

        verify(chargeUserApiHttpClient, times(1)).charge(eq("UserId123"), eq(new BigDecimal("25.45")));
    }
}