electron/spec-main/api-ipc-main-spec.ts

import { expect } from 'chai'
import * as path from 'path'
import * as cp from 'child_process'
import { closeAllWindows } from './window-helpers'
import { emittedOnce } from './events-helpers'
import { ipcMain, BrowserWindow } from 'electron'

describe('ipc main module', () => {
  const fixtures = path.join(__dirname, '..', 'spec', 'fixtures')

  afterEach(closeAllWindows)

  describe('ipc.sendSync', () => {
    afterEach(() => { ipcMain.removeAllListeners('send-sync-message') })

    it('does not crash when reply is not sent and browser is destroyed', (done) => {
      const w = new BrowserWindow({
        show: false,
        webPreferences: {
          nodeIntegration: true
        }
      })
      ipcMain.once('send-sync-message', (event) => {
        event.returnValue = null
        done()
      })
      w.loadFile(path.join(fixtures, 'api', 'send-sync-message.html'))
    })

    it('does not crash when reply is sent by multiple listeners', (done) => {
      const w = new BrowserWindow({
        show: false,
        webPreferences: {
          nodeIntegration: true
        }
      })
      ipcMain.on('send-sync-message', (event) => {
        event.returnValue = null
      })
      ipcMain.on('send-sync-message', (event) => {
        event.returnValue = null
        done()
      })
      w.loadFile(path.join(fixtures, 'api', 'send-sync-message.html'))
    })
  })

  describe('ipcMain.on', () => {
    it('is not used for internals', async () => {
      const appPath = path.join(fixtures, 'api', 'ipc-main-listeners')
      const electronPath = process.execPath
      const appProcess = cp.spawn(electronPath, [appPath])

      let output = ''
      appProcess.stdout.on('data', (data) => { output += data })

      await emittedOnce(appProcess.stdout, 'end')

      output = JSON.parse(output)
      expect(output).to.deep.equal(['error'])
    })
  })
})