Create test for re-exported default value.

[williamscs]

No description provided.

[williamscs]

I'm talking from this context: https://github.com/rollup/rollup-plugin-commonjs/issues/414#issuecomment-555321255

The way that the library seems to expect to work is that "Carousel" is the default export for index. I don't think this is the way this library would treat the exports from the index.

[shellscape]

Please keep your fork around so we can reference this failing test once the plugin is moved to rollup/plugins. We'll be transferring the referenced issue to the new repo.