Simple ATM Controller

Implementation of a simple atm controller for Bear Robotics OA, February 2022

Available operations

Insert Card => PIN number => Select Account => See Balance/Deposit/Withdraw

How To Run

Clone the project using

git clone https://github.com/mukanov8/simple-atm-controller.git

Make sure you have python installed on your machine (I am using python 3.10.2). You can check you python version using following command

python --version 

To run ATM, run following in the project directory

python main.py

To test, run following in the project directory

python test.py

or

python test.py -v

Details

• Initially, the ATM holds 30000$, defined as INITIAL_AVAILABLE_AMOUNT constant in the constant.py file.

• Any Withdraw operation for more than that amount or amount being held on the selected account will raise a withdraw error.

• Account, Transaction, and Status constant types are defined separately in a contant.py file.

  Account = {
      'CHECKING': 'Checking',
      'SAVINGS': 'Savings',
  }
  
  Transaction = {
      'DEPOSIT': 'Deposit',
      'WITHDRAW': 'Withdraw',
      'BALANCE': 'Balance',
  }
  
  Status = {
      'ERROR': 'Error',
      'SUCCESS': 'Success',
  }

• ATM utilizes mock card&account information, defined as a mockBankDb in Bank(bank.py)

  mockBankDb = {
      '2022-2022-0000-0000': {
          'pin': '0000',
          'accounts': {
              Account['CHECKING']: {
                  'balance': 10000,
              },
              Account['SAVINGS']: {
                  'balance': 20000,
              },
          },
      },
      '2022-2022-0000-0001': {
          'pin': '0001',
          'accounts': {
              Account['CHECKING']: {
                  'balance': 20000,
              },
              Account['SAVINGS']: {
                  'balance': 40000,
              },
          },
      },
      '2022-2022-0000-0002': {
          'pin': '0002',
          'accounts': {
              Account['CHECKING']: {
                  'balance': 30000,
              },
              Account['SAVINGS']: {
                  'balance': 50000,
              },
          },
      },
  }

Demo

ATM

Test