Custom element in scopedSlots doesn't work

[renanbronchart]

Version

1.0.0-beta.25

Reproduction link

https://github.com/renanbronchart/gommette/tree/feat/components_accordion

Steps to reproduce

I write test for component Accordion who use scopedSlots with custom component.
But when run my test, the custom component in scoped slot is not register.

I register my component in localVue but it seems doesn't work.

What is expected?

My component custom inner scoped slot should be register

What is actually happening?

My component custom inner scoped slot is not register

---

My test

      import { GoAccordion, GoCollapse } from '../../../src'

      const localVue = createLocalVue()


      localVue.component('go-collapse', GoCollapse)

      wrapper = mount(GoAccordion, {
        localVue,
        propsData: {
          listItems: newItems
        },
        scopedSlots: {
          default: `<template slot-scope="{ items }">
              <go-collapse
                v-for="(item, key) in items"
                :key="key"
                :index="key"
                :item="item"
                :beDeleted="true"
              />
            </template>
          `
        },
        components: {
           GoCollapse
        }
      })

My errror in console

    [Vue warn]: Unknown custom element: <go-collapse> - did you register the component correctly? For recursive components, make sure to provide the "name" option.

[ronaldborman]

I have the same problem.

My observation is that when you register the component with the global Vue class, it works (regardless if you use localVue or not). But that pollutes the global Vue class. If you register it on localVue and use that when mounting the component, then the error mentioned above is displayed.

It also only happens with scoped slots because with regular slots the custom element is recognized after you register it on localVue.

[metasean]

I'm seeing similar errors after a bump up to 1.0.0-beta.27