• Create domain models from user stories
• Create class diagrams from domain models
• Use a red, green, refactor approach to develop robust software
• Use object-oriented principles to organise a codebase

• Fork this repository and clone the forked version to your machine
• Open the Boolean.sln

It's time to flex your programming skills. There are no classes or tests included in this repository to get you started, but you will find the usual ./Boolean.CSharp.Main directories to place your classes and ./Boolean.CSharp.Test tests in.

Your task is to use everything you've learned to build a small banking application.

1. You must create domain models from the user stories provided and include them in the repository
2. You must create class diagrams from your domain models
3. You must use a test-driven development approach to complete this challenge, demonstrate this by committing your work after writing a test and after writing source code to pass it
4. You must demonstrate object-oriented principles. You need not include every concept, but you should strive to include as many as possible
5. You can decide whether to use composition, inheritance, or a combination of both, but at least one must be present

As a customer,
So I can safely store use my money,
I want to create a current account.

As a customer,
So I can save for a rainy day,
I want to create a savings account.

As a customer,
So I can keep a record of my finances,
I want to generate bank statements with transaction dates, amounts, and balance at the time of transaction.

As a customer,
So I can use my account,
I want to deposit and withdraw funds.

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

As an engineer,
So I don't need to keep track of state,
I want account balances to be calculated based on transaction history instead of stored in memory.

As a bank manager,
So I can expand,
I want accounts to be associated with specific branches.

As a customer,
So I have an emergency fund,
I want to be able to request an overdraft on my account.

As a bank manager,
So I can safeguard our funds,
I want to approve or reject overdraft requests.

As a customer,
So I can stay up to date,
I want statements to be sent as messages to my phone.