11. Solution: Argument Matchers

Solution: Argument Matchers

Add Dependency

        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-junit-jupiter</artifactId>
            <version>3.6.0</version>
            <scope>test</scope>
        </dependency>

Update Test Class

@ExtendWith(MockitoExtension.class)
class TimeZoneServiceTest {

    private TimeZoneService timeZoneService;

    @Mock
    private WorldTimeApiClient worldTimeApiClient;

    @BeforeEach
    void init() {
        timeZoneService = new TimeZoneService(worldTimeApiClient);
    }

    @Test
    void getAvailableTimezoneText_timeApiReturnsStringList_returnsCountriesAsString() {
        List<String> validTimeZones = List.of("Amsterdam", "Andorra", "Astrakhan", "Athens");
        when(worldTimeApiClient.getValidTimeZones(anyString())).thenReturn(validTimeZones);

        String expectedReturn = "Amsterdam, Andorra, Astrakhan, Athens";

        String availableTimezoneText = timeZoneService.getAvailableTimezoneText("Europe");

        assertTrue(availableTimezoneText.contains(expectedReturn));
    }
}