You are reading the documentation for version 2.2. Magento 2.3 is the latest version available. Ensure you are reading the documentation for your version of Magento.

Troubleshoot the Functional Testing Framework issues

Installation issues

Selenium Server issue

Error message:

PHPUnit_Extensions_Selenium2TestCase_WebDriverException: Unable to connect to host on port 7055 after 45000 ms. Firefox console output: in selenium server console output