Glad to see the new release! Thank you for your great work.
I tried to upgrade to beta.10, but failed with an error.

I'm using yarn in windows10.
Sorry about that. I've released a fixed version beta.11.
Note that vue-test-utils has been moved to @vue/test-utils:
npm install --save-dev @vue/test-utils
I am curious about the reason for changing the package name.
Vue is moving to scoped packages, so vue-test-utils, becomes @vue/test-utils.
Henry Zhu wrote a good article on why scoped packages are useful—https://babeljs.io/blog/2017/12/27/nearing-the-7.0-release#renames-scoped-packages-babelx
Thanks for explaining! 😄