Suggestion-for-RSpec-Custom-matcher

邦題: カスタムマッチャーを流行らせたい

RSpec のもろもろの協力機能のうちの一つである Custom matcher はとても良いのだけど思った以上にマイナーである。
それを何とかして流行らせたいので、紹介しました。

Transcript

1. Suggestion for 
 RSpec Custom Matcher
   ! ΧελϜϚονϟʔΛ
   ྲྀߦΒ͍ͤͨ MOROHASHI Kyosuke @2014-03-01 ԭೄRubyձٞ01
2. ॾڮګհ
   (@moro)
   Kyosuke MOROHASHI
6. Suggestion for 
 RSpec Custom Matcher
   ! ΧελϜϚονϟʔΛ
   ྲྀߦΒ͍ͤͨ MOROHASHI Kyosuke @2014-03-01 ԭೄRubyձٞ01
7. Ϣχοτςετʹ
   ͋Γ͕ͪͳ͜ͱ
8. ✓ ࡉ͔͍ example ͕͍ͬͺ͍ ✓ example ͷू·Γ͔Βʮৼ Δ෣͍ʯΛ૝૾ͮ͠Β͍ ✓ ύϥϝλϥΠζਏ͍
9. let(:job) { create(:job) } ! before do job.import_task_statuses( [:success, :doing, :success, :error] ) end ! specify { expect(job.tasks.where(status: :success)).to have(2).records } ! specify { expect(job.tasks.where(status: :doing)).to have(1).records }
10. Rails doesn’t save YOUR Applications! (it’s an awesome FRAMEWORK!) http://sapporo.rubykaigi.org/2012/ja/schedule/details/79.html http://sapporo.rubykaigi.org/2012/ja/schedule/details/79.html
11. Rails doesn’t save YOUR Applications! (it’s an awesome FRAMEWORK!) http://sapporo.rubykaigi.org/2012/ja/schedule/details/79.html
12. Rails doesn’t save YOUR Applications! (it’s an awesome FRAMEWORK!) http://sapporo.rubykaigi.org/2012/ja/schedule/details/79.html also RSpec, too
13. Test facilities for
 YOUR Applications.
14. ✓ Arrange: Smart factory &/or
 Shared context ✓ Act: Your nice facade in 
 production code ✓ Assert: ?
15. CustomMatcher ͷ
    ͝ఏҊ
16. ΞϓϦέʔγϣϯ
    εέʔϧͷޠኮ
17. RSpec::Matchers. define(:matchers_name) do |expected| match do |actual| actual == expected end end
18. RSpec::Matchers. define(:matchers_name) do |expected| match do |actual| actual == expected end end
19. ΞϓϦέʔγϣϯ
    εέʔϧͷޠኮ
20. RSpec::Matchers. define(:have_task_statuses) do |expectation| ! match do |actual| statuses = actual.tasks.each_with_object(Hash.new( hash[t.status] += 1 } ! expect(statuses).to eq expectation end end
21. let(:job) { create(:job) } ! before do job.import_task_statuses( [:success, :doing, :success, :error] ) end ! specify do expect(job).to have_task_statuses( success: 2, doing: 1, error: 1 ) end
22. let(:job) { create(:job) } ! before do job.import_task_statuses( [:success, :doing, :success, :error] ) end ! specify { expect(job.tasks.where(status: :success)).to have(2).records } ! specify { expect(job.tasks.where(status: :doing)).to have(1).records } Before
23. let(:job) { create(:job) } ! before do job.import_task_statuses( [:success, :doing, :success, :error] ) end ! specify do expect(job).to have_task_statuses( success: 2, doing: 1, error: 1 ) end After
24. https://relishapp.com/rspec/rspec-expectations/v/3-0/docs/custom-matchers
25. ·ͱΊ
26. ✓ CustomMatcher؆୯Ͱ͠ΐ ✓ ͪΐͬͱͣͭҭͯΕ͹OK
27. Rails doesn’t save YOUR Applications! (it’s an awesome FRAMEWORK!) http://sapporo.rubykaigi.org/2012/ja/schedule/details/79.html also RSpec, too
28. ΞϓϦέʔγϣϯϩδοΫΛ ݕূ͢ΔͨΊͷޠኮΛ࡞Δͱ
    ΞϓϦέʔγϣϯϩδοΫΛ ݕূ͠΍͘͢ͳΔ
29. http://martinfowler.com/articles/rubyAtThoughtWorks/metaprogramming.png