charli-wild / banking-kata

Banking Kata

Develop an application that can deposit funds, withdraw funds and print a statement of a customer’s bank account activity.

Here's the specification for an acceptance test that expresses the desired behaviour for this:

Given a client makes a deposit of 1000 on 10/01/2021
And a deposit of 2000 on 13/01/2021
And a withdrawal of 500 on 14/01/2021
When they print their bank statement

Then they would see:

Date || Amount || Balance  
14/01/2021 || -500 || 2500  
13/01/2021 || 2000 || 3000  
10/01/2021 || 1000 || 1000

Further Guidance

• Writing your tests first may help steer you in your design, you can use a testing framework such as Mocha.
• Don't worry about spacing and indentation in the statement output. (You could instruct your acceptance test to ignore whitespace if you wanted to.)
• Use the acceptance test to guide your progress towards the solution.
• When in doubt, go for the simplest solution!
• You can Google syntax.

You may want to start with a deposit(amount) function and go from there…

Pre-requisties

• Node.js
• Git client (optional)

Download

If you have git installed then you can run the following commands in your terminal:

git clone https://github.com/think-money/banking-kata.git

Alternatively download and unzip the folder from GitHub.

Setup

npm install

Run npm test in the console to ensure that the Jest framework is working correctly. Happy coding!