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Bank Tech Test

This is a command line application written in Ruby using Test Driven Development with Rspec.

The user should interact with the application using the REPL IRB.

The requirements of the brief are to be able to deposit and withdraw money from a bank account and display a bank statement with the correct amount and dates of the transactions.

User Stories

As a customer,
So I can access my money,
I should be able to withdraw money from my bank account.

As a customer,
So I can save my money,
I should be able to deposit money into my bank account.

As a customer,
So I know how much money I have available,
I should be able to view my bank balance.

As a customer,
So I can check when I made my transactions,
I should be able to view the date money goes in and out of my account.

As a customer,
So I can keep track of my transaction history,
I should be able to view my full bank statement.

Installation

git clone https://github.com/ellie-keen/bank-tech-test.git
cd bank-tech-test
bundle install

Running the Program in IRB

# Load dependencies
load './lib/bank_account.rb'
load './lib/bank_statement.rb'

# Create a BankAccount instance and make some transactions
bank_account = BankAccount.new
bank_account.deposit(100)
bank_account.withdraw(50)

# Check your statement by creating a BankStatement instance
bank_statement = BankStatement.new
bank_statement.print_statement(bank_account)

# =>
date || credit || debit || balance
18/07/2018 || || 50.00 || 50.00
17/07/2018 || 100.00 || || 100.00

Code Quality and Testing

This program has 100% test coverage as shown using the Simplecov Gem

Alt text

I used Rubocop to check that my code follows Ruby conventions and readability.

When it came to mocking time in my tests, I decided to use the Timecop gem.

Testing was written using Rspec

Alt text

Run Rspec tests
rspec

My Approach

  • To complete this task, I first split up the brief into User Stories. This gave me a clear idea about each feature I needed to implement so that I didn't leave anything uncovered.
  • I then used Domain Modelling to clearly seperate those features out into Objects and Messages.
  • I started diagramming to see how the structure of my program would look to help me get started and had 3 clearly defined objects - BankAccount, Transaction and BankStatement with clear methods.
  • I used Test Driven Development so that my application was built robustly and used the Red, Green, Refactor approach.