Behaviour Driven
Development with
RSpec
Aslak Hellesøy
CTO
blog.aslakhellesoy.com

David Chelimsky
Aslak Hellesøy
16000 downloads
Ranked 31 at RubyForge
40 contributors
2000 svn commits
890.000 Google hits
100% coverage
100% self describing
833 examples

GSoC

JRuby << RSpec

Background

TDD

Problem

Developers don’t know...
• where to start
• what to test
• what not to test
• how much to test in one go
• what to call tests
• how to fix a broken test
• that TDD is about design

Test?

Assert??

Sapir-Whorf

BDD

BDD helps you realise
• where to start • outside-in
• what to test • user stories
• what not to test • anything else
• how much to test in one go • as little as possible
• what to call tests • intent
• how to fix a broken test • documentation
• that TDD is about design • RSpec

Behaviour
The actions or reactions of an
object or organism, usually in
relation to the environment.
Anything that an organism does
involving action and response
to stimulation.
Anything a computer system
does in response to messages.

As a bowler
I want to have my score calculated
So that I don’t have to do it myself

Design
Documentation
Tests

http://rspec.rubyforge.org/