remix-project/test-browser/commands/setupMetamask.js

const EventEmitter = require('events')

class MetaMask extends EventEmitter {
  command (passphrase, password) {
    this.api.perform((done) => {
      setupMetaMask(this.api, passphrase, password, () => {
        done()
        this.emit('complete')
      })
    })
    return this
  }
}

function setupMetaMask (browser, passphrase, password, done) {
  browser
  .switchBrowserWindow('chrome-extension://poemojpkcjbpmcccohjnomjffeinlafe/home.html#initialize/welcome', 'MetaMask', (browser) => {
    browser.waitForElementPresent('.first-time-flow__button')
    .click('.first-time-flow__button')
    .waitForElementPresent('.select-action__select-button:nth-of-type(1) > .first-time-flow__button')
    .click('.select-action__select-button:nth-of-type(1) > .first-time-flow__button')
    .waitForElementPresent('.page-container__footer-button:nth-of-type(2)')
    .click('.page-container__footer-button:nth-of-type(2)')
    .waitForElementPresent('.first-time-flow__textarea')
    .setValue('.first-time-flow__textarea', passphrase)
    .setValue('*[autocomplete="new-password"]', password)
    .setValue('*[autocomplete="confirm-password"]', password)
    .click('.first-time-flow__checkbox')
    .click('.first-time-flow__button')
    .pause(5000)
    .click('.first-time-flow__button')
    .perform(() => {
      done()
    })
  })
}

module.exports = MetaMask