Working solo to solve a challenging technical problem by writing well crafted code.
- I write code others can easily understand
- I can build with objects
- I can test-drive my code
After clonding this project, fire up the console and navigate to the project's directory.
Once you're there run bundle install to install the necessary gems.
$ git clone https://github.com/MarcusKerr/bank-tech-test.git
$ cd bank-tech-test
$ bundle install
Next you will need to start IRB and require the BankAccount.rb file.
$ irb
> require './lib/BankAccount.rb'
Now we will want to make instantiate a bank account so we can track our moneis!
> monzo = BankAccount.new
Once you have a bank account, feel free to depsoit and withdraw, go crazy! Both deposit and withdraw take an integer as an argument.
> monzo.deposit(100)
> monzo.withdraw(50)
you can withdraw funds past zero and go minus, however there is a defult overdraft limit of 1500.
When you're ready to see how much you spent on the weekend, go ahead and print your statement.
> monzo.print_statement
Thats it, Go nuts!
- You should be able to interact with your code via a REPL like IRB or the JavaScript console. (You don't need to implement a command line interface that takes input from STDIN.)
- Deposits, withdrawal.
- Account statement (date, amount, balance) printing.
- Data can be kept in memory (it doesn't need to be stored to a database or anything).
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
from the acceptance critera I devises some user stories:
As a client
So that I can accumulate my wealth in a single place
I would like to open a bank account.
As a client
So I can check on my wealth
I would like to view my balance.
As a client
So I can add to my wealth
I would like to make deposits to my account.
As a client
So I can splurge
I would like to make witrhdrawals from my account.
As a client
So I can keep track of my wealth
I would like to print my bank statement and see my transactions.
| Objects | Messages |
|---|---|
| Client | |
| BankAccount | deposit(amount), withdraw(amount), print_statement, balance |
BankAccount <-- deposit(amount) --> balance += amount
BankAccount <-- withdraw(amount) --> balance -= amount
BankAccount <-- print_statement --> transactions
Bankaccount <-- balance --> balance
I decided to allow the user to make a withdrawal, this is because I felt this would make a more realistic system, I live in minus! I have set an overdraft limit thought (they cant just continue to go minus, that would be ridiculous). By default the overdraft limit is 1500. this can be overridden by passing an integer as an argument when instantiating a Bank Account.
> starling = BankAccount.new(3000)
I stuck to TDD, feature testing in irb and passing those feature tests by writing a unit test in rspec. I encountered some difficulty when I came to writing the print_statemnt method as it relied on Transactions, it was at this point I began creating doubles and implemented a few units simultaneously.