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github からユーザを検索する javascript と、それをテストする mocha (コンソール版)

github からユーザを検索する

元ネタは現代の JavaScript チュートリアル

rethrow.js
'use strict';

const fetch = require('node-fetch');

const rl =
  require('readline')
    .createInterface({ input: process.stdin, output: process.stdout });

class HttpError extends Error {
  constructor(response) {
    super(`${response.status} for ${response.url}`);
    this.name = 'HttpError';
    this.response = response;
  }
}

function loadJson(url) {
  return fetch(url)
    .then(response => {
      if (response.status == 200) return response.json();
      else                        throw new HttpError(response);
    });
}

function demoGithubUser() {
  rl.question('Enter a name? : ', name => {
    return loadJson(`https://api.github.com/users/${name}`)
      .then(user => {
        console.log(`Full name: ${user.name}.`);
        rl.close();
        return user;
      })
      .catch(err => {
        if (err instanceof HttpError && err.response.status == 404) {
          console.log('No such user, please reenter.');
          return demoGithubUser();
        } else {
          throw err;
        }
      });
  });
}

demoGithubUser();

実行結果

rethrow.jpg

mocha でテスト

3つテストがあります。それぞれ node を立ち上げます。

test.js
'use strict';

const assert = require('assert');
const child_process = require('child_process');

let proc;

describe("rethrow", () => {
  beforeEach(() =>
    proc = child_process.spawn('node', ['./rethrow.js'], { stdio: 'pipe' })
  )

  it('should output a prompt.', done => {
    proc.stdout.once('data', output => {
      assert.equal(output, 'Enter a name? : ');
      proc.stdin.end();
      done();
    });
  });

  it('should accept a name', done => {
    proc.stdout.once('data', output => {
      proc.stdin.write('matz\n');
      proc.stdout.once('data', output => {
        assert.equal(output, 'Full name: Yukihiro "Matz" Matsumoto.\n');
        done();
      });
    });
  })

  it('should answer for user who is none', done => {
    proc.stdout.once('data', output => {
      proc.stdin.write('no-such-user\n');
      proc.stdout.once('data', function (output) {
        assert.equal(output, 'No such user, please reenter.\n');
        proc.stdin.end();
        done();
      });
    });
  })
});

実行結果

test.jpg

参考にしたページ

追記

readline-sync 使ったほうが楽ジャマイカ?

maangie
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