• https://developer.wordpress.org/cli/commands/scaffold/plugin-tests/
• Ensure valid output for form tabs, sections/subtabs, fields, & json_encode output.
• Helper functions to ensure proper data integrity.

Resources from #731:

• https://make.wordpress.org/core/handbook/testing/automated-testing/
• WP Mock
• https://felix-arntz.me/blog/using-the-wordpress-test-suite/
• https://tfrommen.de/an-introduction-to-unit-testing-for-wordpress/
• http://wptest.io/
• https://www.smashingmagazine.com/2017/12/automated-testing-wordpress-plugins-phpunit/