I'm starting to love and love more Storybooks. They have an official addon that tests the accessibility of your components.
This is great, since there's a lot of people that cares about accessibility but doesn't know how to implement it and with this plugin you can easily see what's wrong with your components and fix it (e.g. "your form is missing a label")
It would be great if it would be implemented by default thought
https://github.com/storybookjs/storybook/tree/master/addons/a11y