input: Write a python function to test the balance retrieval, deposit, and withdrawal functionalities of the Customer class.
  assert test_customer_class_balance("John Doe", "123456", 1000, 200, 300) == 900
  assert test_customer_class_balance("Jane Smith", "654321", 5000, 1500, 1000) == 5500
  assert test_customer_class_balance("Alice Johnson", "789123", 2500, 500, 700) == 2300
output: def test_customer_class_balance(name, account_number, initial_balance, deposit_amount, withdrawal_amount):
      class Customer:
          def __init__(self, name, account_number, balance):
              self.name = name
              self.account_number = account_number
              self.balance = balance
  
          def deposit(self, amount):
              if amount > 0:
                  self.balance += amount
  
          def withdraw(self, amount):
              if 0 < amount <= self.balance:
                  self.balance -= amount
  
          def get_balance(self):
              return self.balance
  
      customer = Customer(name, account_number, initial_balance)
      customer.deposit(deposit_amount)
      customer.withdraw(withdrawal_amount)
      return customer.get_balance()