eater

Transcript

1. Eater @yosuke_furukawa

2. @yosuke_furukawa

3. Hello, Noders. This is Full-time Papa committer

4. None

5. child_process.spawn()

6. None

7. Node Quiz

8. Quiz: child_process API ͷԼهͷ ҧ͍͸ԿͰ͠ΐ͏ 1. exec 2. spawn 3.

   fork

9. A: spawn ͕Ұ൪ϩʔϨϕϧ exec/fork ͸ spawn ͷ wrapper

10. A: exec ͸ callback Ͱड͚Δɺ fork ͸ JavaScript ͷίʔυ Λ

    Node.js ͱͯ͠࠶࣮ߦ͢Δ

11. child_process.spawn const spawn = require('child_process').spawn; const ls = spawn('ls', [‘-al']);

    ls.stdout.on('data', (data) => { console.log(data); }); ls.stderr.on('data', (data) => { console.log(data); }); ls.on('exit', (code) => { if (code !== 0) console.error(`Error occurred`); });

12. child_process.exec const exec = require('child_process').exec; exec(‘ls -al‘, (err, stdout, stderr)

    => { console.log(`${stdout}`); console.error(`${stderr}`); if (error !== null) { console.error(`Error occurred`); } });

13. child_process.fork const fork = require('child_process').fork; const ls = fork(‘ls.js’); ls.stdout.on('data',

    (data) => { console.log(data); }); ls.stderr.on('data', (data) => { console.log(data); }); ls.on('exit', (code) => { if (code !== 0) console.error(`Error occurred`); });

14. spawn > exec ͜ͷॱͰ simple exec > spawn ͜ͷॱͰ easy

    spawn > fork ͜ͷॱͰ simple fork > spawn ͜ͷॱͰ easy

15. Easy / Simple ͷҧ͍

16. None

17. Simple !== Easy

18. Simple is “୯७” ٬؍తɺҰͭͷࣄ͔͠͠ͳ͍

19. Easy is “؆୯” ओ؍తɺ”୭͔”ʹͱͬͯ؆୯ “୭ʹͱͬͯ΋؆୯”͸ ଘࡏ͠ͳ͍

20. ॳ৺ऀ͕ؕΓ͕ͪͳࣄɿ Easy ͷݴ༿ʹὃ͞Ε͕ͪ ୭ʹͱͬͯ΋Easy ͳΜͯ͋Γ ͑ͳ͍

21. ॳ৺ऀ͕ؕΓ͕ͪͳࣄɿ Simple ͱ Easy Λࠞಉ͍ͯ͠ Δ࿩ʹࠔ࿭͞Ε͕ͪ

22. Eater

23. Eater is *Ea*sy *t*est runn*er*

24. Eater has one simple rule If test file outputs `stderr`

    message, the test failed.

25. Easy => ୭ʹͱͬͯʁ `node` ͔͠஌Βͳ͍Α͏ͳਓ mocha/jestͷࡉ͔͍ߏจΛ֮ ͑ͯͳͯ͘ɺnode ίϚϯυ ͰεΫϦϓτͱ࣮ͯ͠ߦ͢Δ ͚ͩͰΠφϑͳਓ

26. Eaterͷtest script͸ `node` command Ͱ΋࣮ߦͰ͖Δ

27. Easy => ୭ʹͱͬͯʁ mock/spyΛଟ༻͢Δ͚Ͳɺ mock/spyͷ։์࿙ΕΛ๨Ε ͕ͪͳਓʹͱͬͯ

28. Eaterͷtest͸ҰͭҰ͕ͭผϓ ϩηεͰ࣮ߦ͞ΕΔ

29. mockΛ։์͠ͳͯ͘OK // you don’t need to fix mock/spy console.log =>

    (message) { assert(message.match(/Foo Bar/)); }; const mockDate = new Date(2016, 3, 9); Date.now = () => { return mockDate.valueOf(); }; process.exit => (exitcode) { assert(exitcode === 1); };

30. ͔͠΋ϓϩηε਺͸ίΞ਺Ͱ ಄ଧͪʹͳΔ eater ——procs 4 ※procs optionͰՄม

31. Eater DEMO https://github.com/yosuke- furukawa/eater-demo

32. Happy Eater https://github.com/yosuke- furukawa/eater