Test with :)

The slides for Rubyconf China 2013 with animation off

Transcript

1. test with :) chen songyong
2. about me
3. about me • Remote worker! • Worked in start-ups, web consultancies , banks and digital agencies! • @aquajach in Twitter & Github
4. test in old days
5. do you ❤️ write test? do you write test?
6. Q & A
7. why you test • Forget to go for test first
8. technical debt "we have not found anything to ease the transition from 'hairball of code with no unit tests' to 'unit-testable code'."
9. trust your mind code
10. my practice integration test controller test model / lib test
11. my practice Test Implementation “Pay” button works controller deals with pay request model/lib makes the transaction views controller model/lib pass pass pass
12. why you test • Forget to write test first! • Too much extra work
13. 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
14. is it true? •No! v.s. test in rails console
15. why you test • Forget to write test first! • Extra work! • Maintenance is painful
16. 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
17. why you test • Forget to write test first! • Extra work! • Maintenance is painful! • Running test takes longer and longer
18. easiest way to go • CPU! ! • Data storage! ! • Memory
19. 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)
20. Tool / Framework • spork! • zeus! • spring! • Parallel test! • Guard! • … … Ryan Bates’ Railscasts SKIP
21. rspec v.s. rake spec Update: run via bin/rspec
22. database clean strategy • :transaction! • simply rollback - fastest! • Failed at:! • multiple connections! • integration test
23. database clean strategy • :truncation! • TRUNCATE table! • remove all records! • VACUUM table! • index! • Failed at:! • concurrent access to a table
24. database clean strategy • :deletion! • DELETE from table! • scan the table! • less predictable! • Bad at:! • Large tables
25. Deletion Truncation
26. database Clean strategy
27. 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’
28. defer garbage collection
29. Original + rspec command + DB clean strategy + refactor Gemfile + delay garbage collection 0 65 130 195 260
30. factory v.s. fixture • Flexibility! ! • Callbacks & validations! ! • Speed
31. ! 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
32. not about speed but... • Selective testing! • slow! • focus! • Fail immediately --fail-fast! • Display message immediately! -- format Fuubar! • rspec -p spec
33. (real) Q & A