Quality Code With Cucumber Presentation

Aslak Hellesøy - Chief Scientist
http://cukes.info/
twitter.com/aslak_hellesoy
aslak.hellesoy@gmail.com

http://www.ﬂickr.com/photos/cobalt/190883654/

http://www.ﬂickr.com/photos/atomicshark/215358660

THIS IS
REALLY
BAD
NEWS!!
http://www.ﬂickr.com/photos/jelles/2656101758/

85 committers
989 github followers
33000 gem downloads
30 related tools
http://www.ﬂickr.com/photos/twose/887903401/

http://www.ﬂickr.com/photos/purrr/126597849/
It s testing crack.
One serious stab
at using it and
I'm hooked.

features
step_deﬁnitions
support
env.rb
webrat_steps.rb
paths.rb
Installing Cucumber
$ gem install cucumber webrat rspec-rails rspec
$ script/generate cucumber

ENV["RAILS_ENV"] ||= "test"
require File.expand_path(File.dirname(__FILE__) +
'/../../config/environment')
require 'cucumber/rails/world'
require 'cucumber/formatter/unicode'
Cucumber::Rails.use_transactional_fixtures
Cucumber::Rails.bypass_rescue
# Plus some more setup stuff.....
env.rb

module NavigationHelpers
# When /^I go to (.+)$/ do |page_name|
def path_to(page_name)
case page_name
when /the homepage/
'/'
when /^(.*)'s profile page$/i
user_profile_path(User.find_by_login($1))
else
raise "Can't find mapping for "#{page_name}""
end
end
end
World(NavigationHelpers)
paths.rb

Quality Code With Cucumber Presentation

Proposal notification
In order to reduce time spent on emailing
Administrators should be able to
mail proposal status to all owners

Feature: Proposal notification
Administrators should be able to mail
all proposals owners depending on status
Scenario: Email accepted proposal
Given aslak.hellesoy@gmail.com proposed Cucumber
And the Cucumber proposal is approved
When I send proposal emails
Then aslak.hellesoy@gmail.com should get email
"""
Hi aslak.hellesoy@gmail.com
Congratulations, Cucumber was accepted.
See you at RailsConf!
"""
Our First Feature
features/proposal_notiﬁcation.feature

$ cucumber features/proposal_notification.feature
Run the feature

"""
"""
1 scenario (1 undefined)
4 steps (4 undefined)

You can implement step definitions for undefined steps
with these snippets:
Given /âslak.hellesoy@gmail.com proposed Cucumber$/ do
pending
end
Given /^the Cucumber proposal is approved$/ do
pending
end
When /Î send proposal emails$/ do
pending
end
Then /âslak.hellesoy@gmail.com should get email$/ do
|string|
pending
end

pending
end
pending
end
When /Î send proposal emails$/ do
pending
end
Then /âslak.hellesoy@gmail.com should get email$/ do
|string|
pending
end
Step Definitions
features/step_definitions/proposal_steps.rb

features
step_deﬁnitions
support
env.rb
proposal_steps.rb
paths.rb
webrat_steps.rb
proposal_n..n.feature

TODO (Cucumber::Pending)
features/step_definitions/proposal_steps.rb:2
features/proposal_notification.feature:7
"""
"""

Proposal.create!({
:email => 'aslak.hellesoy@gmail.com',
:title => 'Cucumber'
})
end
Do what Regexp says

uninitialized constant Proposal (NameError)
"""
"""

$ script/generate rspec_scaffold proposal
email:string title:string approved:boolean
$ rake db:migrate db:test:clone
$ cucumber features --no-source
Make it Pass

"""
"""

proposal = Proposal.find_by_title('Cucumber')
proposal.approved = true
proposal.save!
end
Implement Intention

"""
"""

When /^I send mass proposal email$/ do
visit(’admin’)
click_button("Send proposal emails")
end
Webrat

When I send mass proposal email
No route matches "/admin" with {:method=>:get}
"""
"""

Add the Controller
class AdminController < ApplicationController
def index
end
end

Could not find link "Send proposal emails"
"""
"""

Add the link
<%= link_to("Send proposal emails",
:action => 'mass_email') %>

And #mass_email
def index
end
def mass_email
end
end

"""
"""

Email-Spec
Then /^... should get email$/ do |body|
open_email('aslak.hellesoy@gmail.com')
current_email.body.should == body
end

def index
end
def mass_email
approved = Proposal.find_all_by_approved(true)
approved.each do |proposal|
AdminMailer.deliver_notification_email(proposal)
end
end
end
Controller

class AdminMailer < ActionMailer::Base
def notification_email(proposal)
recipients proposal.email
from "confreg@oreilly.com"
subject "Your Railsconf proposal"
body :proposal => proposal
end
end
Mailer

Hi <%= @proposal.email %>
Congratulations, <%= @proposal.title %> was accepted.
Mailer template

Steps & Step Deﬁnitions
end
Step == Method invocation
Step Deﬁnition == Method defnition

Regexp group arguments
Given /^(.+) proposed (.+)$/ do |email, proposal_name|
end
$CUCUMBER_COLORS

Quoted arguments
Given I have "22" cukes in my belly
Given /^I have "([^"]*)" cukes in my belly$/ do |n|
end
Given I have "2" cukes in my belly

Multiline args (String)
"""
"""
Then /^(.+) should get email$/ do |email, body|
end

OH HAI: STUFFING
MISHUN: CUCUMBR
I CAN HAZ IN TEH BEGINNIN 3 CUCUMBRZ
WEN I EAT 2 CUCUMBRZ
DEN I HAZ 2 CUCUMBERZ IN MAH BELLY
AN IN TEH END 1 CUCUMBRZ KTHXBAI
$ cucumber -l en-lol stuffing.feature

Then /^I should have "(d+)" cukes my belly$/ do |cukes|
@belly.cukes.length.should == cukes.to_i
end
RSpec
@belly.should have(cukes.to_i).cukes
end
Kosher RSpec
assert_equal(@cukes.to_i, @belly.cukes.length)
end
Test::Unit

Line numbers
Then bla bla # features/step_definitions/bla_steps.rb:16

Stack traces
Could not find link "Send proposal emails"
features/notification.feature:9
$ cucumber features/notifications.rb:9

Hooks
Before do
end
After do |scenario|
end
World do
end
World(MyModule)
World(HerModule)
support/hooks.rb or support/env.rb

Feature: Notification emails
Background:
| email | title |
Scenario: Approved
Background: Rejected
Background

Tagged Hooks
Before('@im_special', '@me_too') do
@icecream = true
end
@me_too
Feature: Lorem
Scenario: Ipsum
Scenario: Dolor
Feature: Sit
@im_special
Scenario: Amet
Scenario: Consec

Feature: Take over the world
I want it all
@spanish @french @english
Scenario: Take over Europe
@spanish @english
Scenario: Take over America
@english
Scenario: Take over Australia
cucumber -t spanish doit.featurecucumber -t ~french doit.feature
Tagged Execution

a.feature
b.feature
x_steps.rb
y_steps.rb
Your
CodeRSpec/Test::Unit/Shoulda

Quality Code With Cucumber Presentation

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