Gutenberg

What to test:

For users:

Widgets call for testing

1. Migrating from classic widgets
2. Install the latest version of WordPress
   1. Activate a theme that has support for sidebars
   2. Install a plugin that provides widgets
3. Add some widgets
4. Adding blocks next to widgets
   1. Using the stand alone editor with all widgets areas accessible at once
   1. Using the customizer with real time preview
5. Opting out of the new widgets screen

For developers:

1. Upgrading classic widgets to blocks
2. 3^rd party widgets compatibility