public void BankAccount_GetByCustomerId()
        {
            // Arrange
            _dbContext.Customers.Add(new Customer
            {
                Name        = Guid.NewGuid().ToString(),
                Surname     = Guid.NewGuid().ToString(),
                DateCreated = DateTime.UtcNow
            });
            _dbContext.SaveChanges();

            var bankAccountRepository = new BankAccountRepository(_dbContext);

            _dbContext.BankAccounts.Add(new BankAccount
            {
                CustomerId = 1
            });
            _dbContext.SaveChanges();

            // Act
            var bankAccount = bankAccountRepository.GetByCustomerId(1);

            // Assert
            Assert.NotNull(bankAccount);
        }