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ES6なクラスをmocha,chaiでテストする

Last updated at Posted at 2017-01-10

結論から言うといつものmochaコマンドを

mocha --compilers js:babel-core/register

とすればトランスパイルが走ってES6をテストできます。

例えばこのようなクラスがあったとします

ReceiveParameter.es6

export default class RecieveParameter {
  constructor(e) {
    const req = JSON.parse(e.postData.contents);
    const payload = req.payload;
    this.status = payload.status;
    this.subject = payload.subject;
    this.build_url = payload.build_url;
    this.branch = payload.branch;
    this.reponame = payload.reponame;
    this.username = payload.username;
  }

  returnParams() {
    return {
      status: this.status,
      subject: this.subject,
      build_url: this.build_url,
      branch: this.branch,
      reponame: this.reponame,
      username: this.username,
    };
  }
}

このクラスをテストするスクリプトは、以下となります。

ReceiveParameterSpec.es6

import chai from 'chai';
import ParameterClass from 'ReceiveParameter';
let should = chai.should();
// import {should, expect} from 'chai';

describe('ParameterClass', () => {
  const contents = {
    payload: {
      status: 'fixed',
      subject: '',
      build_url: '',
      branch: '',
      reponame: '',
      username: ''
    }
  };
  const request = {
    postData: {
      contents: JSON.stringify(contents)
    }
  };
  let params;

  beforeEach(() => {
    params = new ReceiveParameter(request);
  });

  context('this is first test script.', () => {
    it('test!', () => {
      const result = params.returnParams();
      result.status.should.equal('fixed');
    });
  });
});

テストスクリプトの中でもimportの様なes6構文が使えます。

あとはmochachaiをインストールして

mocha --compilers js:babel-core/register

コマンドを実行してください。

このコマンドはトランスパイルを実行するので、babelの設定を忘れないでください。

自分の場合、babel-preset-latestをインストールしています。

まとめ

es6によりJavaScriptがよりOOPしやすい言語となり、テスト・振る舞い駆動開発と相性がよくなった印象です。

参考文献

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