Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Test with :)
Search
aquajach
October 26, 2013
Technology
3
120
Test with :)
The slides for Rubyconf China 2013 with animation off
aquajach
October 26, 2013
Tweet
Share
More Decks by aquajach
See All by aquajach
Separate the data logic from your application
aquajach
0
77
Grow from Small Simple Steps
aquajach
0
380
Other Decks in Technology
See All in Technology
一歩ずつ成長しながら進める ZOZOの基幹システムリプレイス/Growing Stap by Stap ZOZO BackOffice System Replacement
cocet33000
2
350
人生を左右する「即答」のススメ: 一瞬の判断を間違えないためにするべきこと
takasyou
9
1.2k
Oracle Cloud Infrastructure IaaS 新機能アップデート 2024/12 - 2025/02
oracle4engineer
PRO
0
110
IAMのマニアックな話2025
nrinetcom
PRO
6
1.6k
俯瞰と個別の⼆つの視点で紡ぐ スクラムマスターの成⻑と協働 / Dual Views Weaving Scrum Master Growth
toma_sm
1
100
アウトカムを最大化させるプロダクトエンジニアの動き
hacomono
PRO
0
170
貧民的プログラミングのすすめ
kakehashi
PRO
2
330
2025/3/1 公共交通オープンデータデイ2025
morohoshi
0
130
Platform Engineeringで クラウドの「楽しくない」を解消しよう
jacopen
5
310
AIエージェント開発のノウハウと課題
pharma_x_tech
10
5.8k
Qiita Organizationを導入したら、アウトプッターが爆増して会社がちょっと有名になった件
minorun365
PRO
1
390
結果的にこうなった。から見える メカニズムのようなもの。
recruitengineers
PRO
1
140
Featured
See All Featured
Helping Users Find Their Own Way: Creating Modern Search Experiences
danielanewman
29
2.5k
Evolution of real-time – Irina Nazarova, EuRuKo, 2024
irinanazarova
6
590
Adopting Sorbet at Scale
ufuk
75
9.2k
jQuery: Nuts, Bolts and Bling
dougneiner
63
7.7k
VelocityConf: Rendering Performance Case Studies
addyosmani
328
24k
Facilitating Awesome Meetings
lara
53
6.3k
GraphQLの誤解/rethinking-graphql
sonatard
69
10k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
356
29k
Automating Front-end Workflow
addyosmani
1369
200k
How to Think Like a Performance Engineer
csswizardry
22
1.4k
Fireside Chat
paigeccino
36
3.2k
Building Your Own Lightsaber
phodgson
104
6.3k
Transcript
test with :) chen songyong
about me
about me • Remote worker! • Worked in start-ups, web
consultancies , banks and digital agencies! • @aquajach in Twitter & Github
test in old days
do you ❤️ write test? do you write test?
Q & A
why you test • Forget to go for test first
technical debt "we have not found anything to ease the
transition from 'hairball of code with no unit tests' to 'unit-testable code'."
trust your mind code
my practice integration test controller test model / lib test
my practice Test Implementation “Pay” button works controller deals with
pay request model/lib makes the transaction views controller model/lib pass pass pass
why you test • Forget to write test first! •
Too much extra work
is it true? Writing test adds 15-35% development time in
return for a 40-90% reduction in defect density on otherwise like-for-like projects. - A paper in ESE •YES
is it true? •No! v.s. test in rails console
why you test • Forget to write test first! •
Extra work! • Maintenance is painful
it 'Sign Up should have title' do! visit '/tc/'! page.find('div#sign-up-modal').should
have_css(‘#modalHeader.h5-sign-up-header’, :text => “Apple Now”) ! end
why you test • Forget to write test first! •
Extra work! • Maintenance is painful! • Running test takes longer and longer
easiest way to go • CPU! ! • Data storage!
! • Memory
test suite example • ruby 2.0.0 / rails 3.2.13 /
rspec-rails ~>2.0 / PostgreSQL /Factory Girl / Database cleaner! • 370+ mixed with unit test, integration test (w/ capybara inc. JavaScript)! • No remote request (w/ VCR)
Tool / Framework • spork! • zeus! • spring! •
Parallel test! • Guard! • … … Ryan Bates’ Railscasts SKIP
rspec v.s. rake spec Update: run via bin/rspec
database clean strategy • :transaction! • simply rollback - fastest!
• Failed at:! • multiple connections! • integration test
database clean strategy • :truncation! • TRUNCATE table! • remove
all records! • VACUUM table! • index! • Failed at:! • concurrent access to a table
database clean strategy • :deletion! • DELETE from table! •
scan the table! • less predictable! • Bad at:! • Large tables
Deletion Truncation
database Clean strategy
refactor gemfile • stop loading gems not used in the
code! • e.g. gem ‘unicorn’, require: false! • specify dependencies for test environment! • ‘jquery-rails’, ‘will_paginate’, ‘exception_notification’
defer garbage collection
Original + rspec command + DB clean strategy + refactor
Gemfile + delay garbage collection 0 65 130 195 260
factory v.s. fixture • Flexibility! ! • Callbacks & validations!
! • Speed
! best practice • create(:user) v.s. build(:user) v.s. build_stubbed(:user)! •
require ‘spec_helper’ v.s. require ‘lib_class.rb’! • mock/stub or not to mock/stub! • let v.s. let! v.s. before block
not about speed but... • Selective testing! • slow! •
focus! • Fail immediately --fail-fast! • Display message immediately! -- format Fuubar! • rspec -p spec
(real) Q & A