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Eater
@yosuke_furukawa
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@yosuke_furukawa
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Hello, Noders.
This is Full-time Papa
committer
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No content
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child_process.spawn()
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Node Quiz
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Quiz:
child_process API ͷԼهͷ
ҧ͍ԿͰ͠ΐ͏
1. exec
2. spawn
3. fork
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A:
spawn ͕Ұ൪ϩʔϨϕϧ
exec/fork spawn ͷ
wrapper
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A:
exec callback Ͱड͚Δɺ
fork JavaScript ͷίʔυ
Λ Node.js ͱͯ͠࠶࣮ߦ͢Δ
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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`);
});
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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`);
}
});
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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`);
});
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spawn > exec
͜ͷॱͰ simple
exec > spawn
͜ͷॱͰ easy
spawn > fork
͜ͷॱͰ simple
fork > spawn
͜ͷॱͰ easy
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Easy / Simple ͷҧ͍
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Simple !== Easy
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Simple is
“୯७”
٬؍తɺҰͭͷࣄ͔͠͠ͳ͍
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Easy is
“؆୯”
ओ؍తɺ”୭͔”ʹͱͬͯ؆୯
“୭ʹͱͬͯ؆୯”
ଘࡏ͠ͳ͍
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ॳ৺ऀ͕ؕΓ͕ͪͳࣄɿ
Easy ͷݴ༿ʹὃ͞Ε͕ͪ
୭ʹͱͬͯEasy ͳΜͯ͋Γ
͑ͳ͍
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ॳ৺ऀ͕ؕΓ͕ͪͳࣄɿ
Simple ͱ Easy Λࠞಉ͍ͯ͠
Δʹࠔ͞Ε͕ͪ
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Eater
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Eater is
*Ea*sy *t*est runn*er*
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Eater has one simple rule
If test file outputs `stderr` message, the test failed.
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Easy => ୭ʹͱͬͯʁ
`node` ͔͠Βͳ͍Α͏ͳਓ
mocha/jestͷࡉ͔͍ߏจΛ֮
͑ͯͳͯ͘ɺnode ίϚϯυ
ͰεΫϦϓτͱ࣮ͯ͠ߦ͢Δ
͚ͩͰΠφϑͳਓ
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Eaterͷtest script `node`
command Ͱ࣮ߦͰ͖Δ
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Easy => ୭ʹͱͬͯʁ
mock/spyΛଟ༻͢Δ͚Ͳɺ
mock/spyͷ։์࿙ΕΛΕ
͕ͪͳਓʹͱͬͯ
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EaterͷtestҰͭҰ͕ͭผϓ
ϩηεͰ࣮ߦ͞ΕΔ
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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);
};
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͔͠ϓϩηείΞͰ
಄ଧͪʹͳΔ
eater ——procs 4 ※procs optionͰՄม
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Eater DEMO
https://github.com/yosuke-
furukawa/eater-demo
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Happy Eater
https://github.com/yosuke-
furukawa/eater