Cuke2Beer

How do we know we are done?
Build
Specification
Tests Cases
Test
Deploy

Long feedback loops
Keeping specs, system and test cases in sync
Silos of specification, build, test

Reduces feedback loops
Combines specifications, test cases &code
Promotes collaboration

Specification
Executable!

Executable Specification

Cucumber Organization
Load
Match
Features
Step Definitions
Call
System Under Test

Feature File
Feature: Turn cucumber into beer
As a cucumber presenter
I want beer after my presentation
So I can enjoy the rest of DemoCampGuelph
Scenario: Brydon buys Declan beer
Given Brydon hosts DemoCampGuelph
When Declan demos Cucumber
Then Brydon should buy Declan 1 beer
Scenario: Ali buys Declan beer
Given Ali hosts DemoCampGuelph
Then Ali should buy Declan 1 beer

Step Definitions
Given /^(.+) hosts/ do |host|
@event = Event.new(host)
end
When/^(.+) demos/ do |presenter|
@event.add(presenter)
end
Then/^(.+) should buy (.+) (d+) (.*)$/ do |buyer, drinker, qty, item|
perk = @event.perks[0];
perk.buyer.should == buyer; perk.receiver.should == drinker
perk.quantity.should == quantity.to_i; perk.item.should == item
end

System Under Test
class Event
attr_reader :perks
def initialize(host) @host = host; @perks = [] end
def add(presenter)
@perks.pushPerk.new(@host, presenter, 1, "beer")
end
end
class Perk
attr_reader :buyer, :receiver, :quantity, :item
def initialize(buyer, receiver, quantity, item)
@buyer = buyer; @receiver = receiver
@quantity = quantity; @item = item
end
end

Execution
End
end
“Brydon”
end

Execution
End
end
“Declan”
end

Execution
End
end
end

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Cucumber Support

More Stuff
http://cukes.info/
http://wiki.github.com/aslakhellesoy/cucumber
Declan Whelan
http://dpwhelan.com
http://twitter.com/dwhelan