Outside-In TDD with Acceptance Tests

 

Objective

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

Problem description - Bank kata

  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 the following structure:

public class Account {

    public void deposit(int amount);

    public void withdrawal(int amount);

    public void printStatement();

}

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).