New config test for register add ons

[atanasster]

Describe the bug

using a register file in the add ons section generates a console error:

ERR! Addon value should end in /register OR it should be a valid preset https://storybook.js.org/docs/presets/introduction/
ERR! /Users/atanasster/storybook-addon-deps/dist/register.js

To Reproduce

module.exports = {
  addons: [require.resolve('./register')],
}  

[shilman]

Hurrah!! I just released https://github.com/storybookjs/storybook/releases/tag/v5.3.0-rc.12 containing PR #9347 that references this issue. Upgrade today to try it out!

You can find this prerelease on the @next NPM tag.

Closing this issue. Please re-open if you think there's still more to do.

[RuneKR]

Hi. The solution does not work on a MacBook. Regex fails for absolute paths such as /User/Rune/some/nested/@at/here/register.js

[shilman]

Yippee!! I just released https://github.com/storybookjs/storybook/releases/tag/v5.3.4 containing PR #9485 that references this issue. Upgrade today to try it out!