public async Task ReturnRoleName_WhenValidUserIdIsPassed()
        {
            var userStoreMock = new Mock <IUserStore <User> >();
            var userManager   = new UserManager <User>(userStoreMock.Object, null, null, null, null, null, null, null, null);

            var contextOptions = new DbContextOptionsBuilder <BedeSlotsDbContext>()
                                 .UseInMemoryDatabase(databaseName: "ReturnRoleName_WhenValidUserIdIsPassed")
                                 .UseInternalServiceProvider(serviceProvider).Options;

            var user = new User();

            var role = new IdentityRole("User");

            IdentityUserRole <string> userRole;

            using (var bedeSlotsContext = new BedeSlotsDbContext(contextOptions))
            {
                bedeSlotsContext.Roles.Add(role);
                bedeSlotsContext.Users.Add(user);

                userRole = new IdentityUserRole <string>()
                {
                    UserId = user.Id, RoleId = role.Id
                };

                bedeSlotsContext.UserRoles.Add(userRole);
                bedeSlotsContext.SaveChanges();
            }

            using (var bedeSlotsContext = new BedeSlotsDbContext(contextOptions))
            {
                var sut = new Data.UserService(bedeSlotsContext,
                                               userManager);

                var result = await sut.GetUserRoleNameAsync(user.Id);

                Assert.IsTrue(result == role.Name);
            }
        }
        public async Task ThrowServiceException_WhenNullArgumentIsPassed()
        {
            var userStoreMock = new Mock <IUserStore <User> >();
            var userManager   = new UserManager <User>(userStoreMock.Object, null, null, null, null, null, null, null, null);

            var contextOptions = new DbContextOptionsBuilder <BedeSlotsDbContext>()
                                 .UseInMemoryDatabase(databaseName: "ThrowServiceException_WhenNullArgumentIsPassed")
                                 .UseInternalServiceProvider(serviceProvider).Options;

            var transactionServiceMock = new Mock <ITransactionService>();

            using (var bedeSlotsContext = new BedeSlotsDbContext(contextOptions))
            {
                var sut = new Data.UserService(bedeSlotsContext,
                                               userManager);

                await Assert.ThrowsExceptionAsync <ServiceException>(async() => await sut.GetUserRoleNameAsync(null));
            }
        }