public void GetUserWorkspaces_WorkspacesExist_FetchesViaRepository()
        {
            string     authUserId = Guid.NewGuid().ToString();
            string     cacheKey   = CacheKeys.UserWorkspace(authUserId);
            IDbContext dbContext  = Substitute.For <IDbContext>();
            IEnumerable <WorkspaceViewModel>?cachedViewModel = null;
            UserDbModel userDbModel = new UserDbModel();

            userDbModel.Workspaces = new string[1] {
                "workspace1"
            };

            WorkspaceDbModel[] workspaceDbModels = new WorkspaceDbModel[1] {
                new WorkspaceDbModel()
            };

            UserRepository userRepository = Substitute.For <UserRepository>();

            userRepository.GetByAuthIdAsync(dbContext, authUserId).Returns <UserDbModel>(userDbModel);

            WorkspaceRepository workspaceRepository = Substitute.For <WorkspaceRepository>();

            workspaceRepository.GetManyByIdAsync(dbContext, userDbModel.Workspaces).Returns(workspaceDbModels);

            IMemoryCacheWrapper memoryCache = Substitute.For <IMemoryCacheWrapper>();

            memoryCache.Get <IEnumerable <WorkspaceViewModel> >(cacheKey).Returns(cachedViewModel);

            UserWorkspaceViewService         userWorkspaceViewService = new UserWorkspaceViewService(dbContext, memoryCache, Substitute.For <IMapper>(), userRepository, workspaceRepository);
            IEnumerable <WorkspaceViewModel> result = userWorkspaceViewService.GetUserWorkspaces(authUserId).Result;

            // assert
            workspaceRepository.Received(1).GetManyByIdAsync(dbContext, userDbModel.Workspaces);
        }