WTF is TDDA journey to writing awesome code, one test at a time

WTF we'll be covering● What is testing and why you are hurting the

world by not doing it● What is TDD, why do it, and why it's better

than writing tests AFTER you've written your code

● See code that was developed using TDD● Extending this code

Who TF is this guy?● Steven Nunez (@_StevenNunez)

○ Junior Developer at Cyrus Innovation■ AWESOME PLACE!

● Agile/TDD All day, E'ryday○ Organizer of Unearth Ruby

■ http://www.meetup.com/unearthruby/○ Co-Organizer of NYC Rubyist Roundtable

■ http://www.meetup.com/nycruby/

Stuff you need to F'ing knowHow to read this:class Order attr_reader :items

def initialize @items = Hash.new(0) end

def add(item) items[item] += 1 end end

The Act of isolating parts of your code with a known state to ensure it works as expected.

Setup follows AAA principle:

ArrangeAct Assert

What Is Testing

Types of testing● End to end tests/ Acceptance tests

○ Here there be Cucumbers. Capybara, Webrat○ Used to ensure system works as a whole

● Unit Tests○ Rspec, Test::Unit, Minitest○ View tests○ Controller tests○ Model tests

● Lets you know when things broke○ You'd be surprised how code works

● Allows for courageous refactoring● Gives documentation on how your code is

SUPPOSED to work● It is your duty to deliver working code.

Why Test

Testing basicsWe'll be using Rspec...http://rspec.info/https://github.com/rspec/rspec-expectations#built-in-matchers

Codey Code! ----> http://bit.ly/PUwQLf

What is Test Driven Development?

Why do TDD?● Forces you to think small

○ You have a clear objective● Less thoughts to juggle

○ All you know is how you want it to work● Leads to modular code

○ Each part of your code does one job● Write less code● Increase documentation ● It makes you happy!

○ Red, Green, REFACTOR!http://edu.mkrecny.com/thoughts/be-nice-to-programmers

How to TDDRed Green Refactor 1. Write a test.2. Watch it fail.3. Write code to pass your test.4. Look for ways to make your code more

expressive5. GOTO 1

Our projectOur client is developing a social network based for his Restaurant customers. He'd want to eventually have people with similar food interests meet up and discuss how his food changed their lives.

● A few features he wants are: ○ The ability to have users discover new foods based on ingredients they love (Bacon!)○ The ability to find users with similar food interests. The system will automatically share their phone

numbers with each other. (He thinks they'll be ok with this)What do you need first?I need a way to capture customer orders based on their menu.

Things we built A Menu with Menu Items in it. The Items need to have a name, price, calorie count, and ingredientsOrders consist of a menu item, and a quantity.Orders can calculate their total

Your task!Pair up and work on getting the recommendation engine up.

Noobs, pair up with Wizards.

TDD ONLY!

https://github.com/StevenNunez/FinerDiner

Questions!

TaskMenu#recommendations(:bacon)# => [:bacon_cheeseburger, :blt, :bacone ]

Socializer#socialize!# customer_1.hook_up(customer_2)

Resourceshttps://www.relishapp.com/rspechttp://pragprog.com/book/achbd/the-rspec-bookPractical Object Oriented Design by Sandy Mentzhttp://www.poodr.info/

THANKS!