Writing a NightwatchJS test

Similar to a functional JavaScript test, NightwatchJS uses Google Chrome to evaluate tests. However, instead of PHP files, the test files are written entirely in JavaScript and require NodeJS and yarn to run and interact with.

Getting ready

NightwatchJS is not included as part of PHPUnit, so you will need to install it using yarn:

1. Inside the /core folder, run yarn install.
2. Configure NightwatchJS settings by copying .env.example to .env and editing as necessary. These settings will mostly be the same as your local environment settings. DRUPAL_TEST_BASE_URL will be the value of your local site URL, for example.

How to do it…

NightwatchJS looks for tests in the following directories:

• mymodule/tests/src/Nightwatch/Tests
• mymodule/tests/src/Nightwatch/Commands
• mymodule/tests/src/Nightwatch/Assertions
• mymodule/tests/src/Nightwatch/Pages

Here, mymodule is your custom module name, like chapter13, which...