Bank account kata

Outside-In TDD with acceptance tests kata based on github - sandro mancuso

Objective

Learn and practice the double loop of TDD Test application from outside, identifying side effects.

Problem description: Create a simple bank application with the following features:

• Deposit into Account
• Withdraw from an Account
• Print a bank statement to the console

Acceptance criteria

Statement should have transactions in the following format:

  DATE       | AMOUNT  | BALANCE
  10/04/2014 | 500.00  | 1400.00
  02/04/2014 | -100.00 | 900.00
  01/04/2014 | 1000.00 | 1000.00

Starting point and constraints

Start with a class/module the following structure:

class Account {

    deposit(amount: int): void

    withdrawal(amount: int): void

    printStatement(): void
}

You are not allowed to add any other public method to this class.

NOTE: In order to keep the exercise simple, use Int for money and String for dates. Also, you can ignore the formatting of the statement (spaces between pipes and words, etc).