public ManageKitsService(NetworkService velosNetworkService, EmailService emailService, Environment environment, RestClient restClient, Properties properties, ManageKitsDao manageKitsDao, StudyDao studyDao) {
        this.NetworkService = NetworkService;
        this.emailService = emailService;
        this.environment = environment;
        this.restClient = restClient;
        this.properties = properties;
        this.manageKitsDao = manageKitsDao;
        this.studyDao = studyDao;
        .............
       ...............
        ...............
    }

private ManageKitsDao mockManageKitsDao;
            private RestClient mockRestClient;

            @BeforeEach
            public void setUp() throws KitException {
               mockManageKitsDao = mock(ManageKitsDao.class);
                mockRestClient = mock(RestClient.class);
               ..............
               ................
             }

        @Test
        public void itShouldRevokeAssignedKit() {
        when(mockManageKitsDao.getXXXX()).thenReturn(something)
        ...........some other mocking.............
            ManageKitsService manageKitsService = new ManageKitsService(mockNetworkService, mockEmailService, mockEnvironment, mockRestClient, mockProperties, mockManageKitsDao,
                            mockStudyDao);
   assertThatCode(() -> {
    manageKitsService.revokeAssignedKit(123, kitAssignment);
        }).doesNotThrowAnyException();
   }

@RunWith(MockitoJUnitRunner::class)
class MyTestClass {

@Mock
private ManageKitsDao mockManageKitsDao;

@Mock
private RestClient mockRestClient;

@InjectMocks
private ManageKitsService manageKitsService

// Your service will automatically be instantiated with all of the mocks
// Now you can just write your tests like normal, using manageKitsService

}