public async Task ReturnUserCurrency_WhenValidUserIdIsPassed()
        {
            var contextOptions = new DbContextOptionsBuilder <BedeSlotsDbContext>()
                                 .UseInMemoryDatabase(databaseName: "ReturnUserCurrency_WhenValidUserIdIsPassed")
                                 .UseInternalServiceProvider(serviceProvider).Options;

            var user = new User()
            {
                Currency = Currency.BGN
            };

            using (var bedeSlotsContext = new BedeSlotsDbContext(contextOptions))
            {
                await bedeSlotsContext.Users.AddAsync(user);

                await bedeSlotsContext.SaveChangesAsync();
            }
            using (var bedeSlotsContext = new BedeSlotsDbContext(contextOptions))
            {
                var sut    = new Data.CurrencyService(bedeSlotsContext);
                var result = await sut.GetUserCurrencyAsync(user.Id);

                Assert.IsTrue(result == user.Currency);
                Assert.IsInstanceOfType(result, typeof(Currency));
            }
        }
        public async Task ThrowServiceException_WhenThereAreNoUsersInDatabase()
        {
            var contextOptions = new DbContextOptionsBuilder <BedeSlotsDbContext>()
                                 .UseInMemoryDatabase(databaseName: "ThrowServiceException_WhenThereAreNoUsersInDatabase")
                                 .UseInternalServiceProvider(serviceProvider).Options;

            using (var bedeSlotsContext = new BedeSlotsDbContext(contextOptions))
            {
                var sut = new Data.CurrencyService(bedeSlotsContext);
                await Assert.ThrowsExceptionAsync <ServiceException>(async() => await sut.GetUserCurrencyAsync("test"));
            }
        }
        public async Task ThrowServiceException_WhenUserCurrencyIsNull()
        {
            var contextOptions = new DbContextOptionsBuilder <BedeSlotsDbContext>()
                                 .UseInMemoryDatabase(databaseName: "ThrowServiceException_WhenUserCurrencyIsNull")
                                 .UseInternalServiceProvider(serviceProvider).Options;

            var user = new User();

            using (var bedeSlotsContext = new BedeSlotsDbContext(contextOptions))
            {
                await bedeSlotsContext.Users.AddAsync(user);

                await bedeSlotsContext.SaveChangesAsync();
            }
            using (var bedeSlotsContext = new BedeSlotsDbContext(contextOptions))
            {
                var sut = new Data.CurrencyService(bedeSlotsContext);
                await Assert.ThrowsExceptionAsync <ServiceException>(async() => await sut.GetUserCurrencyAsync(user.Id));
            }
        }