TypeError: Cannot read property 'installed' of undefined

[deraw]

Version

1.0.0-beta.25

Reproduction link

https://github.com/Deraw-/vue-test-utils-issue

Steps to reproduce

Run yarn then yarn test:unit

What is expected?

Plugin is installed on localVue

What is actually happening?

Error when installing plugin

---

It's really this line localVue.use(Vuetify); on example.spec.ts!

[deraw]

Resolve in this comment from #822 #822 (comment)