CodeceptJS: Fetch Email From Mandrill Using Custom Helper

fetchmail_helper.js

const mandrill = require('mandrill-api/mandrill')
const sleep = require('sleep-promise')
require('dotenv').config()

class FetchMail extends Helper {

  _before() {
    this.apiKey = process.env.MANDRILL_API_KEY
    this.client = new mandrill.Mandrill(this.apiKey)
  }
  
  async grabUrlFromEmail(email) {
    return email['text'].match(/https?:\/\/[\w/:%#\$&\?\(\)~\.=\+\-]+/)[0]
  }

  async fetchMail(mailTo, subject) {
    const query = `full_email:${mailTo} AND subject:${subject}`
    const apiKeys = [this.apiKey]
    const search = (query, apiKeys) => {
      return new Promise((resolve, reject) => {
        this.client.messages.search(
          {
            query,
            apiKeys,
            limit: 100
          },
          result => {
              resolve(result)
          }, 
          err => {
              reject(err)
          }
        )
      })
    }
    let searchResult = await search(query, apiKeys)
    for (var i = 0; i < 12; i++) {
      if (searchResult['length'] === 0) {
        await sleep(10000)
        searchResult = await search(query, apiKeys)
      }
    }

    return new Promise((resolve, reject) => {
      this.client.messages.content(
        {
          id: searchResult[0]._id
        },
        result => {
          resolve(result)
        },
        err => {
          reject(err)
        },
      )
    })
  }
}

module.exports = FetchMail;