eazydict-bing/test/lib/fetch.js

EazyDict Bing词典插件

'use strict'

/**
 * mock node-fetch
 * 单元测试时候使用
 */

const fs = require('fs')
const path = require('path')
const { FetchError } = require('node-fetch')

const NETWORK_ERROR = 'network_error'

const defaultDataPath = path.resolve(__dirname, '../mock/en_world')
let currentDataPath = defaultDataPath

// mock fetch 方法
function fetch () {
  return new Promise((resolve, reject) => {
    if (currentDataPath.includes(NETWORK_ERROR)) {
      return reject(new FetchError())
    }

    fs.readFile(currentDataPath, function (err, data) {
      if (err) {
        return reject(err)
      }

      resolve({
        text () {
          return data.toString()
        }
      })
    })
  })
}

// 重置 mock 数据
fetch.resetData = function (type) {
  try {
    currentDataPath = path.resolve(__dirname, `../mock/${type}`)
  } catch (error) {
    currentDataPath = defaultDataPath
  }
}

module.exports = fetch