### Question:
DefaultProviderDataAccessor implements ProviderDataAccessor { @Override @Transactional(readOnly = true, isolation = Isolation.READ_COMMITTED) public List<ProviderUserModel> getUsersByProviderConfigId(Long providerConfigId) { if (null == providerConfigId) { return List.of(); } return providerUserRepository.findByProviderConfigId(providerConfigId) .stream() .map(this::convertToUserModel) .collect(Collectors.toList()); } @Autowired  DefaultProviderDataAccessor(ProviderProjectRepository providerProjectRepository, ProviderUserProjectRelationRepository providerUserProjectRelationRepository, ProviderUserRepository providerUserRepository,
        ConfigurationAccessor configurationAccessor); @Override @Transactional(readOnly = true, isolation = Isolation.READ_COMMITTED) List<ProviderProject> getProjectsByProviderConfigName(String providerConfigName); @Override @Transactional(readOnly = true, isolation = Isolation.READ_COMMITTED) List<ProviderProject> getProjectsByProviderConfigId(Long providerConfigId); @Override void deleteProjects(Collection<ProviderProject> providerProjects); @Override @Transactional(readOnly = true, isolation = Isolation.READ_COMMITTED) Set<String> getEmailAddressesForProjectHref(String projectHref); @Override @Transactional(readOnly = true, isolation = Isolation.READ_COMMITTED) List<ProviderUserModel> getUsersByProviderConfigId(Long providerConfigId); @Override List<ProviderUserModel> getUsersByProviderConfigName(String providerConfigName); @Override void updateProjectAndUserData(Long providerConfigId, Map<ProviderProject, Set<String>> projectToUserData, Set<String> additionalRelevantUsers); static final int MAX_DESCRIPTION_LENGTH; static final int MAX_PROJECT_NAME_LENGTH; }### Answer:
@Test public void getUsersByProviderConfigIdTest() { ProviderUserEntity providerUserEntity = new ProviderUserEntity(projectOwnerEmail, true, 1L); ProviderProjectRepository providerProjectRepository = Mockito.mock(ProviderProjectRepository.class); ProviderUserRepository providerUserRepository = Mockito.mock(ProviderUserRepository.class); Mockito.when(providerUserRepository.findByProviderConfigId(Mockito.any())).thenReturn(List.of(providerUserEntity)); DefaultProviderDataAccessor providerDataAccessor = new DefaultProviderDataAccessor(providerProjectRepository, null, providerUserRepository, null); List<ProviderUserModel> providerUserModelList = providerDataAccessor.getUsersByProviderConfigId(1L); assertEquals(1, providerUserModelList.size()); ProviderUserModel providerUserModel = providerUserModelList.get(0); assertEquals(projectOwnerEmail, providerUserModel.getEmailAddress()); assertTrue(providerUserModel.getOptOut()); }
@Test public void getUsersByProviderConfigIdNullTest() { DefaultProviderDataAccessor providerDataAccessor = new DefaultProviderDataAccessor(null, null, null, null); List<ProviderUserModel> providerUserModelList = providerDataAccessor.getUsersByProviderConfigId(null); assertTrue(providerUserModelList.isEmpty()); }