Outside-In Development With Cucumber

Outside-In Development With Ben Mabey Saturday, March 14, 2009

Who’s my audience? Saturday, March 14, 2009

Saturday, March 14, 2009

Scenario: planning meeting Given I am a Software Developer When I am given a feature request Then I should... Saturday, March 14, 2009

What is the most CRITICAL word to keep in mind? Saturday, March 14, 2009

W Saturday, March 14, 2009

Scenario: planning meeting Given I am a Software Developer When I am given a feature request Then I should ask why. Saturday, March 14, 2009

_why Saturday, March 14, 2009

Why? Saturday, March 14, 2009

Feature Request: Print Reports Story from Thought works: http:// www.theregister.co.uk/ 2007 /06/25/ Saturday, March 14, 2009

Protect Revenue Increase Revenue Manage Cost Saturday, March 14, 2009

* not executed * documentation value Feature: title * variant of contextra * business value up front In order to [Business Value] As a [Role] I want to [Some Action] (feature) Saturday, March 14, 2009

There is no template. What is important to have in narrative: * business value * stakeholder role * user role * action to be taken by user Saturday, March 14, 2009

Scenario: title Given [Context] When I do [Action] Then I should see [Outcome] Saturday, March 14, 2009

Scenario: title Given [Context] And [More Context] When I do [Action] And [Other Action] Then I should see [Outcome] But I should not see [Outcome] Saturday, March 14, 2009

project_root/ | `-- features Saturday, March 14, 2009

project_root/ | `-- features |-- awesomeness.feature |-- greatest_ever.feature Saturday, March 14, 2009

project_root/ | `-- features |-- awesomeness.feature |-- greatest_ever.feature `-- support |-- env.rb `-- other_helpers.rb Saturday, March 14, 2009

Step Given a widget Saturday, March 14, 2009

Step Deﬁnition Given /^a widget$/ do Given a widget #codes go here end Saturday, March 14, 2009

Step Deﬁnition Step Mother Given /^a widget$/ do Given a widget #codes go here end Saturday, March 14, 2009

Outside-In Saturday, March 14, 2009

Write Scenarios Saturday, March 14, 2009

Steps are pending Saturday, March 14, 2009

Write Step Deﬁnition Saturday, March 14, 2009

Go Down A Gear Saturday, March 14, 2009

RSpec Saturday, March 14, 2009

RSpec We ain’t got no RSPEC! Saturday, March 14, 2009

RSpec, TestUnit, etc Saturday, March 14, 2009

Write Code Example (Unit Test) Saturday, March 14, 2009

Make Example Pass Saturday, March 14, 2009

REFACTOR!! Saturday, March 14, 2009

Where Are we? Saturday, March 14, 2009

Continue until... Saturday, March 14, 2009

REFACTOR and REPEAT Saturday, March 14, 2009

features/manage_my_wishes.feature Feature: manage my wishes In order to get more stuff As a greedy person I want to manage my wish list for my family members to view Scenario: add wish Given I am logged in When I make a quot;New carquot; wish Then quot;New carquot; should appear on my wish list Saturday, March 14, 2009

Line # of scenario Saturday, March 14, 2009

I can has backtraze? Given I am logged in #features/manage_my_wishes.feature:8 Saturday, March 14, 2009

features/i_can_has_wishez_plz.feature OH HAI: I CAN HAS WISHEZ PLZ SO DAT I CAN HAS HUGS TIEM AN PLAY TIEM AN SLEEP TIEM AN NOM TIEM AS NICE GREEDEE KITTEH I CAN PLZ MANEGE TEH WISHEZ MISHUN: MAK NEW WISH GIVN I AM LOGGD IN WEN I MAK quot;CHEEZBURGERquot; WISH DEN I C quot;CHEEZBURGERquot; ON ME WISHEZ LIT Saturday, March 14, 2009

cucumber some.feature --language en-lol Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb Given /^I am logged in$/ do @current_user = create_user(:email_confirmed => true) end Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb Given /^I am logged in$/ do @current_user = create_user(:email_confirmed => true) end Test Data Builder / Object Mother Saturday, March 14, 2009

features/step_definitions/user_steps.rb Given /Î am logged in$/ do @current_user = create_user(:email_confirmed => true) end Fixture Replacement, Fixjour, Factory Girl, etc spec/fixjour_builders.rb Fixjour do define_builder(User) do |klass, overrides| klass.new( :email => quot;user#{counter(:user)}@email.comquot;, :password => 'password', :password_confirmation => 'password' ) end end Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb Given /^I am logged in$/ do @current_user = create_user(:email_confirmed => true) end Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb Given /^I am logged in$/ do @current_user = create_user(:email_confirmed => true) visit new_session_path fill_in quot;Emailquot;, :with => @current_user.email fill_in quot;Passwordquot;, :with => valid_user_attributes[quot;passwordquot;] click_button end Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb Webrat / Awesomeness Given /^I am logged in$/ do @current_user = create_user(:email_confirmed => true) visit new_session_path fill_in quot;Emailquot;, :with => @current_user.email fill_in quot;Passwordquot;, :with => valid_user_attributes[quot;passwordquot;] click_button end Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb Webrat / Awesomeness Given /^I am logged in$/ do @current_user = create_user(:email_confirmed => true) visit new_session_path fill_in quot;Emailquot;, :with => @current_user.email fill_in quot;Passwordquot;, :with => valid_user_attributes[quot;passwordquot;] click_button end features/support/env.rb require 'webrat' Webrat.configure do |config| config.mode = :rails end Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb Webrat / Awesomeness Given /^I am logged in$/ do @current_user = create_user(:email_confirmed => true) visit new_session_path fill_in quot;Emailquot;, :with => @current_user.email fill_in quot;Passwordquot;, :with => valid_user_attributes[quot;passwordquot;] click_button end features/support/env.rb require 'webrat' Webrat.configure do |config| config.mode = :rails end Adapter Saturday, March 14, 2009

features/step_definitions/user_steps.rb Webrat / Awesomeness Given /Î am logged in$/ do @current_user = create_user(:email_confirmed => true) visit new_session_path fill_in quot;Emailquot;, :with => @current_user.email fill_in quot;Passwordquot;, :with => valid_user_attributes[quot;passwordquot;] click_button end features/step_definitions/webrat_steps.rb When /Î press quot;(.*)quot;$/ do |button| click_button(button) end 19 Steps Out-of-box When /Î follow quot;(.*)quot;$/ do |link| click_link(link) end When /Î fill in quot;(.*)quot; with quot;(.*)quot;$/ do |field, value| fill_in(field, :with => value) end Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb Given /^I am logged in$/ do @current_user = create_user(:email_confirmed => true) visit new_session_path fill_in quot;Emailquot;, :with => @current_user.email fill_in quot;Passwordquot;, :with => valid_user_attributes[quot;passwordquot;] click_button # make sure we have actually logged in- so we fail fast if not session[:user_id].should == @current_user.id end Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb Given /^I am logged in$/ do @current_user = create_user(:email_confirmed => true) visit new_session_path fill_in quot;Emailquot;, :with => @current_user.email fill_in quot;Passwordquot;, :with => valid_user_attributes[quot;passwordquot;] click_button # make sure we have actually logged in- so we fail fast if not session[:user_id].should == @current_user.id controller.current_user.should == @current_user end Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb Given /^I am logged in$/ do @current_user = create_user(:email_confirmed => true) visit new_session_path Specify outcome, not implementation. fill_in quot;Emailquot;, :with => @current_user.email fill_in quot;Passwordquot;, :with => valid_user_attributes[quot;passwordquot;] click_button # make sure we have actually logged in- so we fail fast if not session[:user_id].should == @current_user.id controller.current_user.should == @current_user response.should contain(quot;Signed in successfullyquot;) end Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb Given /^I am logged in$/ do @current_user = create_user(:email_confirmed => true) visit new_session_path fill_in quot;Emailquot;, :with => @current_user.email fill_in quot;Passwordquot;, :with => valid_user_attributes[quot;passwordquot;] click_button # make sure we have actually logged in- so we fail fast if not response.should contain(quot;Signed in successfullyquot;) end Saturday, March 14, 2009

No route matches “/sessions/create” with {:method=>:post} (ActionController::RoutingError) Saturday, March 14, 2009

I’m going to cheat... Saturday, March 14, 2009

I’m going to cheat... $ gem install thoughtbot-clearance $ ./script generate clearance $ ./script generate clearance_features Saturday, March 14, 2009

features/step_deﬁnitions/wish_steps.rb When /^I make a quot;(.+)quot; wish$/ do |wish| end Then /^(.+) should appear on my wish list$/ do |wish| end Saturday, March 14, 2009

features/step_deﬁnitions/wish_steps.rb When /^I make a quot;(.+)quot; wish$/ do |wish| end Then /^(.+) should appear on my wish list$/ do |wish| end Regexp Capture -> Yielded Variable Saturday, March 14, 2009

features/step_deﬁnitions/wish_steps.rb When /^I make a quot;(.+)quot; wish$/ do |wish| visit quot;/wishesquot; click_link quot;Make a wishquot; fill_in quot;Wishquot;, :with => wish click_button end Then /^(.+) should appear on my wish list$/ do |wish| end Saturday, March 14, 2009

features/step_deﬁnitions/wish_steps.rb When /^I make a quot;(.+)quot; wish$/ do |wish| visit quot;/wishesquot; click_link quot;Make a wishquot; fill_in quot;Wishquot;, :with => wish click_button end Then /^(.+) should appear on my wish list$/ do |wish| response.should contain(quot;Your wish has been added!quot;) response.should contain(wish) end Saturday, March 14, 2009

features/step_deﬁnitions/wish_steps.rb When /^I make a quot;(.+)quot; wish$/ do |wish| visit quot;/wishesquot; click_link quot;Make a wishquot; fill_in quot;Wishquot;, :with => wish click_button end No route matches “/wishes” with {:method=>:get} appear on my wish list$/ do |wish| Then /^(.+) should (ActionController::RoutingError) response.should contain(quot;Your wish has been added!quot;) response.should contain(wish) end Saturday, March 14, 2009

conﬁg/routes.rb ActionController::Routing::Routes.draw do |map| map.resources :wishes Saturday, March 14, 2009

conﬁg/routes.rb ActionController::Routing::Routes.draw do |map| map.resources :wishes When I make a “New car” wish uninitialized constant WishesController (NameError) Saturday, March 14, 2009

conﬁg/routes.rb ActionController::Routing::Routes.draw do |map| map.resources :wishes $./script generate rspec_controller new create Saturday, March 14, 2009

conﬁg/routes.rb ActionController::Routing::Routes.draw do |map| map.resources :wishes When I make a “New car” wish Could not find link with text or title or id “Make a wish” (Webrat::NotFoundError) Saturday, March 14, 2009

app/views/wishes/index.html.erb <%= link_to quot;Make a wishquot;, new_wish_path %> Saturday, March 14, 2009

app/views/wishes/index.html.erb <%= link_to quot;Make a wishquot;, new_wish_path %> When I make a “New car” wish Could not find field: “Wish” (Webrat::NotFoundError) Saturday, March 14, 2009

features/step_deﬁnitions/wish_steps.rb When /^I make a quot;(.+)quot; wish$/ do |wish| visit quot;/wishesquot; click_link quot;Make a wishquot; fill_in quot;Wishquot;, :with => wish click_button end Saturday, March 14, 2009

features/step_deﬁnitions/wish_steps.rb When /^I make a quot;(.+)quot; wish$/ do |wish| visit quot;/wishesquot; click_link quot;Make a wishquot; fill_in quot;Wishquot;, :with => wish click_button end app/views/wishes/new.html.erb <% form_for :wish do |f| %> <%= f.label :name, quot;Wishquot; %> <%= f.text_field :name %> <%= submit_tag quot;Make the wish!quot; %> <% end %> Saturday, March 14, 2009

features/step_deﬁnitions/wish_steps.rb When /^I make a quot;(.+)quot; wish$/ do |wish| visit quot;/wishesquot; click_link quot;Make a wishquot; fill_in quot;Wishquot;, :with => wish click_button end Location Strategy FTW! app/views/wishes/new.html.erb <% form_for :wish do |f| %> <%= f.label :name, quot;Wishquot; %> <%= f.text_field :name %> <%= submit_tag quot;Make the wish!quot; %> <% end %> Saturday, March 14, 2009

View Controller Saturday, March 14, 2009

spec/controllers/wishes_controller_spec.rb describe WishesController do describe quot;POST / (#create)quot; do end end Saturday, March 14, 2009

spec/controllers/wishes_controller_spec.rb describe WishesController do describe quot;POST / (#create)quot; do it quot;should create a new wish for the user with the paramsquot; do user = mock_model(User, :wishes => mock(quot;wishes associationquot;)) controller.stub!(:current_user).and_return(user) user.wishes.should_receive(:create).with(wish_params) post :create, 'wish' => {'name' => 'Dog'} end end end Saturday, March 14, 2009

app/controllers/wishes_controller.rb class WishesController < ApplicationController def create current_user.wishes.create(params['wish']) end end Saturday, March 14, 2009

spec/controllers/wishes_controller_spec.rb describe WishesController do describe quot;POST / (#create)quot; do before(:each) do ..... it quot;should redirect the user to their wish listquot; do do_post response.should redirect_to(wishes_path) end end end Saturday, March 14, 2009

app/controllers/wishes_controller.rb def create current_user.wishes.create(params['wish']) redirect_to :action => :index end Saturday, March 14, 2009

View Controller Model Saturday, March 14, 2009

app/controllers/wishes_controller.rb def create current_user.wishes.create(params['wish']) redirect_to :action => :index end When I make a “New car” wish undefined method `wishes` for #<User:0x268e898> (NoMethodError) Saturday, March 14, 2009

app/controllers/wishes_controller.rb def create current_user.wishes.create(params['wish']) redirect_to :action => :index end $./script generate rspec_model wish name:string user_id:integer Saturday, March 14, 2009

app/models/wish.rb class Wish < ActiveRecord::Base belongs_to :user end app/models/user.rb class User < ActiveRecord::Base include Clearance::App::Models::User has_many :wishes end Saturday, March 14, 2009

app/models/wish.rb class Wish < ActiveRecord::Base belongs_to :user end app/models/user.rb When I make a “New car” wish Then “New <car” should appear on my wish class User ActiveRecord::Base include Clearance::App::Models::User has_many the following element’s content to include expected:wishes “Your wish has been added!” end Saturday, March 14, 2009

spec/controllers/wishes_controller_spec.rb it quot;should notify the user of creation via the flashquot; do do_post flash[:success].should == quot;Your wish has been added!quot; end Saturday, March 14, 2009

spec/controllers/wishes_controller_spec.rb it quot;should notify the user of creation via the flashquot; do do_post flash[:success].should == quot;Your wish has been added!quot; end app/controllers/wishes_controller.rb def create current_user.wishes.create(params['wish']) flash[:success] = quot;Your wish has been added!quot; redirect_to :action => :index end Saturday, March 14, 2009

spec/controllers/wishes_controller_spec.rb it quot;should notify the user of creation via the flashquot; do do_post flash[:success].should == quot;Your wish has been added!quot; end app/controllers/wishes_controller.rb Then “New car” should appear on my wish expected the following element’s content to include def create “New car” current_user.wishes.create(params['wish']) flash[:success] = quot;Your wish has been added!quot; redirect_to :action => :index end Saturday, March 14, 2009

app/views/wishes/index.html.erb <ul> <% @wishes.each do |wish| %> <li><%= wish.name %></li> <% end %> </ul> Saturday, March 14, 2009

spec/controllers/wishes_controller_spec.rb describe quot;GET / (#index)quot; do def do_get get :index end it quot;should assign the user's wishes to the viewquot; do do_get assigns[:wishes].should == @current_user.wishes end end Saturday, March 14, 2009

app/controllers/wishes_controller.rb def index @wishes = current_user.wishes end Saturday, March 14, 2009

Given the following wishes exist | Wish | Family Member | | Laptop | Thomas | | Nintendo Wii | Candace | | CHEEZBURGER | FuzzBuzz | features/step_deﬁnitions/wish_steps.rb Given /^the following wishes exist$/ do |table| table.hashes.each do |row| member = User.find_by_name(row[quot;Family Memberquot;]) || create_user(:name => row[quot;Family Memberquot;]) member.wishes.create!(:name => row[quot;Wishquot;]) end end Saturday, March 14, 2009

Feature: Addition In order to avoid silly mistakes As a math idiot I want to be told the sum of two numbers Scenario Outline: Add two numbers Given I have entered <input_1> into the calculator And I have entered <input_2> into the calculator When I press <button> Then the result should be <output> on the screen Examples: | input_1 | input_2 | button | output | | 20 | 30 | add | 50 | |2 | 5 | add | 7 | |0 | 40 | add | 40 | Saturday, March 14, 2009

Steps Within Steps When /^I view the wish list for quot;(.+)quot;$/ do |user_name| Given quot;I am logged inquot; visit quot;/wishes/#{user_name}quot; end Saturday, March 14, 2009

Helpers - Ruby FTW When /^I view the wish list for quot;(.+)quot;$/ do |user_name| login_as(create_user) visit quot;/wishes/#{user_name}quot; end Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb def login_as(user) visit new_session_path fill_in quot;Emailquot;, :with => user.email fill_in quot;Passwordquot;, :with => valid_user_attributes[quot;passwordquot;] click_button # make sure we have actually logged in- so we fail fast if not response.should contain(quot;Signed in successfullyquot;) end Given /^I am logged in$/ do @current_user = create_user(:email_confirmed => true) login_as(@current_user) end Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb def login_as(user) visit new_session_path fill_in quot;Emailquot;, :with => user.email fill_in quot;Passwordquot;, :with => valid_user_attributes[quot;passwordquot;] “Every time you monkeypatch click_button # make sure we have actually logged in- so we fail fast if not Object, a kitten dies.” response.should contain(quot;Signed in successfullyquot;) end Given /^I am logged in$/ do @current_user = create_user(:email_confirmed => true) login_as(@current_user) end http://seanohalpin.github.com/unobtrusive-metaprogramming/unobtrusive-metaprogramming.html Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb module UserHelpers def login_as(user) visit new_session_path fill_in quot;Emailquot;, :with => user.email fill_in quot;Passwordquot;, :with => valid_user_attributes[quot;passwordquot;] click_button # make sure we have actually logged in- so we fail fast if not response.should contain(quot;Signed in successfullyquot;) end end Saturday, March 14, 2009

features/step_deﬁnitions/user_steps.rb module UserHelpers def login_as(user) visit new_session_path fill_in quot;Emailquot;, :with => user.email fill_in quot;Passwordquot;, :with => valid_user_attributes[quot;passwordquot;] click_button # make sure we have actually logged in- so we fail fast if not response.should contain(quot;Signed in successfullyquot;) end end World { |world| world.extend UserHelpers } Saturday, March 14, 2009

I can skp teh unit testz? Saturday, March 14, 2009

Acceptance Tests Unit Tests Application Level Object Level- Isolated! For Customers For developers Slow FAST! (should be at least) Good conﬁdence - Tighter Feedback Loop Prevent against More about design!!!!!!!!!!!! regression Will need both gears! Some things are easier to test at the application level and vice-versa. Saturday, March 14, 2009

SRSLY? Model specs, Controller Specs, and view specs!? Saturday, March 14, 2009

W Saturday, March 14, 2009

M Saturday, March 14, 2009

More tests == More Maintenance Saturday, March 14, 2009

Test Value = Design + Documentation + Defence (regression) Saturday, March 14, 2009

if test.value > test.cost Suite.add(test) end Saturday, March 14, 2009

KTHXBYE! BenMabey.com github.com/bmabey Twitter: bmabey IRC: mabes Saturday, March 14, 2009

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Outside-In Development With Cucumber

by Ben Mabey on Mar 14, 2009

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Outside-In Development With Cucumber — Presentation Transcript