Really simple script to login to WordPress admin dashboard, navigate to the page editor, change the title, and submit the page. Records a screenshot at the end.

editor-test.js

const webdriverio = require('webdriverio');

const options = { 
    desiredCapabilities: {
        browserName: 'chrome',
    },
    protocol: 'http',
    host: 'selenium-host',
    logLevel: 'verbose'
};

const client = webdriverio.remote(options);

client
    .init()
    .url('http://some-wordpress-website.com/wp-admin')
    .setValue('#user_login', 'some-user')
    .setValue('#user_pass', 'some-password')
    .getValue('#user_pass')
    .click('#wp-submit')
    .click('#menu-pages')
    .click('.page-title-action')
    .setValue('#title', 'This is an automated page')
    .click('#publish')
    .saveScreenshot('./page-submit.png')
    .end();