Wrong configuration in Testing Single-File Components with Karma

[Juraci]

Version

1.0.0-beta.29

Reproduction link

https://github.com/vuejs/vue-test-utils/blame/v1.0.0-beta.29/docs/guides/testing-single-file-components-with-karma.md#L37

Steps to reproduce

1. Create a new Vue project with @vue/cli@3.x.x without any testing options
2. Follow the steps to setup karma testing here
3. npm run test

What is expected?

Karma should tell you that there are no specs to run.

What is actually happening?

Error messaging telling that ./webpack.config.js doesn't exit.

---

As per @vue/cli@3.x.x the webpack.config.js file is no longer created in the root folder.

This part of the documentation will lead to a broken karma setup: link

[eddyerburgh]

Yes we should update the docs considering that we recommend @vue/cli instead of vue-cli.