Exercise Instructions

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Code Test: Banking

About This Test

The purpose of this code test is to show us your skills in:

•Object Oriented Programming

•TDD

•Clean code

•Git

•Problem solving

Please keep these aspects in mind as you develop your solution. Also, your

chosen implementation doesn't necessarily have to be the best you can think of,

but one that you can implement in the allocated time.

Instructions

•Create a project which models the situation below.

•The language used should be Ruby (unless previously agreed otherwise).

•All code should be tested following TDD.

•A README file must be attached explaining your implementation.

•Create a .zip with your code and git directory.

•Answer our email with the zip of the project.

Background

The software you write in this test will be used for banks. Banks have accounts.

Accounts hold money. Transfers can be made between accounts. Banks store the

history of transfers.

There can be two types of transfers:

•Intra-bank transfers, between accounts of the same bank. They don't

have commissions, they don't have limits and they always succeed.

•Inter-bank transfers, between accounts of different banks. They have 5€

commissions, they have a limit of 1000€ per transfer. And they have a 30%

chance of failure.

Part 1

Create the models and their relationships to accurately reflect banks, accounts

and transfers. Make sure that new types of accounts and transfers can be added

to the bank with minimal effort.

Part 2

After modeling the domain(part 1), create a file called

show_me_the_money.rb* in charge of reproducing the next situation:

Jim





has





an





account





on





the





bank





A





and





Emma





has





an





account





on





the





bank





B.





Jim

owes





Emma





20000€.





Emma





is





already





a





bit





angry,





because





she





did





not





get





the

money





although





Jim





told





her





that





he





already





sent





it.

Help





Jim





send





his





money





by





developing





a





transfer





agent



.





This





agent





assures

that





everybody





gets





their





money.





When





the





agent





receives





an





order





to





transfer

money





from





account





A





to





account





B,





he





issues





transfers





considering





commissions,

transfer





limits





and





possibility





of





transfer





failures.

The execution of the script will print the balance of every account before and after

the transfers and the history of the transfer of every bank.

Questions:

Please also supply your answer to the following questions:

•How would you improve your solution?

•How would you adapt your solution if transfers are not instantaneous?