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PRACTICAL
FASTER TESTING
JON ROWE
WITH RAILS*
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PRACTICAL
FASTER TESTING
JON ROWE
*SORT OF...
WITH RAILS*
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DISCLAIMER
I’m not going to offer tips on how to
speed up your existing legacy tests.
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WHY FAST?
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WHY FAST?
We know this right?
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WHY FAST?
We know this right?
Shorten the feedback cycle
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WHY FAST?
We know this right?
Shorten the feedback cycle
Focus
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WHY FAST?
We know this right?
Shorten the feedback cycle
Focus
Actually write tests
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WHY FAST?
We know this right?
Shorten the feedback cycle
Focus
Actually write tests
“Feel Awesome”@kytrinyx
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SAD TRUTH
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SAD TRUTH
No test is faster than no tests
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SAD TRUTH
No test is faster than no tests
F5DD
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SAD TRUTH
No test is faster than no tests
F5DD
Laziness is easy
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SO WHY SLOW?
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SO WHY SLOW?
“Your code makes it slow”
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SO WHY SLOW?
“Your code makes it slow”
Your tests make it slow
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SO WHY SLOW?
“Your code makes it slow”
Your tests make it slow
And…
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FACT
Rails is what makes your tests slow
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FACT
Rails is what makes your tests slow
But that’s not Rails’ fault
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FACT
Rails is what makes your tests slow
But that’s not *all* Rails’ fault
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THE RAILS WAY
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THE RAILS WAY
Auto load *everything*
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THE RAILS WAY
Auto load *everything*
Integration test
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THE RAILS WAY
Auto load *everything*
Integration test
Magic!
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THE ENEMY
require 'spec_helper'
require 'rspec/rails'
require 'rails'
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THE ENEMY
Booting rails is slow
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THE ENEMY
Booting rails is slow
Unnecessary for unit testing
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CONTROLLERS
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CONTROLLERS
When to test
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CONTROLLERS
When to test
Don’t?
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CONTROLLERS
When to test
Don’t?
Do?
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class SensibleController < ApplicationController
def index
@objects = Record.all
end
def new
@object = Record.new
end
def create
Record.create params[:record]
redirect_to index_path
end
def edit
@record = Record.find(params[:id])
end
def update
Record.find(params[:id]).update_attributes params[:record]
redirect_to index_path
end
end
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class SensibleController < ApplicationController
def create
Record.create! params[:record]
redirect_to index_path
rescue
@record = Record.new params[:record]
render :new
end
def edit
@record = Record.find(params[:id])
rescue NotFound
redirect_to index_path
end
def update
Record.find(params[:id]).update_attributes params[:record]
redirect_to index_path
rescue Validations
@record = Record.new params[:record]
render :edit
rescue NotFound
redirect_to index_path
end
end
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class UberDeathController
def index
@bugs =
if params[:q].blank? && params[:c].blank? && params[:m].blank? && params[:order].bla
Bug.by_gnar_factor.paginate :per_page => @per_page, :page => params[:page]
elsif params[:q].blank? && !params[:c].blank? && params[:m].blank? && params[:order]
Bug.for_section(params[:c]).by_gnar_factor.paginate :per_page => @per_page, :page
elsif params[:c].blank? && !params[:q].blank? && params[:m].blank? && params[:order]
Bug.search_for(params[:q]).by_gnar_factor.paginate :per_page => @per_page, :page =
elsif !params[:c].blank? && !params[:q].blank? && params[:m].blank? && params[:order
Bug.search_for(params[:q]).by_gnar_factor.for_section(params[:c]).paginate :per_pa
elsif params[:c].blank? && params[:q].blank? && !params[:m].blank? && params[:order]
Bug.master_bugs.by_gnar_factor.paginate :per_page => @per_page, :page => params[:p
elsif !params[:c].blank? && params[:q].blank? && !params[:m].blank? && params[:order
Bug.master_bugs.by_gnar_factor.for_section(params[:c]).paginate :per_page => @per_
elsif params[:c].blank? && !params[:q].blank? && !params[:m].blank? && params[:order
Bug.master_bugs.by_gnar_factor.search_for(params[:q]).paginate :per_page => @per_p
elsif !params[:c].blank? && !params[:q].blank? && !params[:m].blank? && params[:orde
Bug.master_bugs.by_gnar_factor.search_for(params[:q]).for_section(params[:c]).pagi
end
end
end
STILL DONT TEST?
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THE TESTS
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THE TESTS
Integration test
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THE TESTS
Integration test
Request Verbs
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THE TESTS
Integration test
Request Verbs
Filters
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THE TESTS
Integration test
Request Verbs
Filters
Slow
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THE TESTS
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THE TESTS
Unit test
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THE TESTS
Unit test
Skip filters
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THE TESTS
Unit test
Skip filters
Focus on your code
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THE TESTS
Unit test
Skip filters
Focus on your code
Let Rails work
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INTEGRATION
require 'spec_helper'
describe ExampleWithModelController do
describe 'post :create' do
subject { post :create }
it "creates a model" do
expect { subject }.to change(RandomModel,:count).by(1)
end
it "redirects away" do
subject.should redirect_to '/'
end
end
end
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INTEGRATION
require 'spec_helper'
describe ExampleWithModelController do
describe 'post :create' do
before { RandomModel.stub(:create) }
subject { post :create }
it "creates a RandomModel" do
RandomModel.should_receive(:create)
subject
end
it "redirects away" do
subject.should redirect_to '/'
end
end
end
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UNIT
require 'action_controller'
require 'app/controllers/application_controller'
require 'app/controllers/example_with_model_controller'
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class RandomModel; end
describe ExampleWithModelController do
describe '#create' do
let(:controller) { described_class.new }
before do
controller.request = Struct.new(:parameters).new
controller.stub(:redirect_to)
end
subject { controller.create }
it "creates a RandomModel" do
RandomModel.should_receive(:create)
subject
end
it "redirects to away" do
controller.should_receive(:redirect_to).with('/')
subject
end
end
end
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RESULTS (x100)
============================
unit
============================
0.000000 0.000000 1.140000 ( 1.149252)
============================
integration
============================
0.000000 0.010000 2.510000 ( 2.498981) (stubbed)
0.000000 0.000000 3.070000 ( 3.175934) (full stack)
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RESULTS (x1000)
============================
unit x1000
============================
0.000000 0.020000 3.060000 ( 3.051226)
============================
integration x1000
============================
0.010000 0.020000 8.380000 ( 8.382151) (stubbed)
0.010000 0.020000 13.160000 ( 15.175460) (full stack)
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YEAH...*
*Caveats
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YEAH...*
Controller stubbing (view isolation)
*Caveats
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YEAH...*
Controller stubbing (view isolation)
What about my filters?
*Caveats
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MODELS
require 'active_record'
config = YAML.load(File.open("config/database.yml"))["test"]
ActiveRecord::Base.establish_connection(config)
require 'app/models/random_model'
0.310000 0.070000 0.380000 ( 0.540731)
require 'spec_helper'
1.300000 0.220000 1.520000 ( 1.756871)
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MODELS
So not much improvement
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MODELS
So not much improvement
DB calls?
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MODELS
So not much improvement
DB calls?
How can we make these faster?
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MODULAR
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MODULAR
Injecting your objects
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MODULAR
Injecting your objects
Code faster?
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MODULAR
Injecting your objects
Code faster?
Slower? No!
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MODULAR
Injecting your objects
Code faster?
Slower? No!
Tests faster? YES!
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MODULAR
Injecting your objects
Code faster?
Slower? No!
Tests faster? YES!
Less to load
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class ChangeStock
def initialize(item)
@item = item
end
def delta
quantity - @item.quantity
end
def to(quantity)
if quantity > @item.quantity
@item.fee_generator.charge_increase delta
end
@item.set_quantity quantity
@item.save!
end
end
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REFACTOR
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REFACTOR
Separate from the framework
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REFACTOR
Separate from the framework
Write your own helpers
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REFACTOR
Separate from the framework
Write your own helpers
Mocking/Stubbing
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BE SENSIBLE
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BE SENSIBLE
Test when it makes sense
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BE SENSIBLE
Test when it makes sense
No hard and fast rules
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BE SENSIBLE
Test when it makes sense
No hard and fast rules
Consider the value
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BOY SCOUT RULE
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BOY SCOUT RULE
Always leave code cleaner
than you found it
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BOY SCOUT RULE
Always leave tests cleaner
than you found them
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SUMMARY
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SUMMARY
Require what you need
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SUMMARY
Require what you need
Unit test your units
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SUMMARY
Require what you need
Unit test your units
Abstract away
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SUMMARY
Require what you need
Unit test your units
Abstract away
Integration/acceptance test framework
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SUMMARY
Require what you need
Unit test your units
Abstract away
Integration/acceptance test framework
Don’t boot rails unless needed
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SUMMARY
Require what you need
Unit test your units
Abstract away
Integration/acceptance test framework
Don’t boot rails unless needed
Be sensible!
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THANKS
Jon Rowe
@jonrowe (twitter, github, etc)
http://jonrowe.co.uk
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