adaptation des consignes du bank-kata https://github.com/sandromancuso/Bank-kata

Your PO gives you as an acceptance test the following scenario:

Given a client makes a deposit of 1000 on 10-01-2012
And a deposit of 2000 on 13-01-2012
And a withdrawal of 500 on 14-01-2012
When she prints her bank statement
Then she would see
date || credit || debit || balance
14/01/2012 || || 500.00 || 2500.00
13/01/2012 || 2000.00 || || 3000.00
10/01/2012 || 1000.00 || || 1000.00 

The specifications constrain you with this interface (due to business contract between your company and your customers):

void deposit(String amount);

void withdrawal(String amount);

String getStatement();

implements this product, guided by tests.

You can follows the Object Calisthenics rules:

• One level of indentation per method
• Don’t use the ELSE keyword
• Wrap all primitives and Strings
• First class collections
• One dot per line
• Don’t abbreviate
• Keep all entities small (50 lines)
• No classes with more than two instance variables
• No getters/setters/properties