Invalid html when mounting a certain html structure

[adi-zz]

Version

1.0.0-beta.27

Reproduction link

https://codesandbox.io/s/0pvmr5wj9p

Steps to reproduce

• Open https://codesandbox.io/s/0pvmr5wj9p
• After the "browser" inside codesandbox.io loads, notice there's no error in codesandbox's Console tab.
• Click on codesandbox's Tests tab. The one test I wrote will run.
• See Console.

What is expected?

• wrapper.html() shoud return a string containing <div class="component-1">Component 1</div> - the content of Component.vue

What is actually happening?

• a warning Unknown custom element: <Component1> - did you register the component correctly? For recursive components, make sure to provide the "name" option.. Not sure why this appears when test runs.
• wrapper.html() returns a string containing <component1></component1>

---

If you remote the <v-container> from Parent.vue, test runs as expected.

[ChuckBorris33]

We have exactly same issue using vueBootstrap and localVue in tests.

https://codesandbox.io/s/ywr3vw3oxx

This issue exists in version 1.0.0-beta.26 and 1.0.0-beta.27. Reverting to version 1.0.0-beta.25 solves issue.

[BeniRupp]

I have a similar problem using vuetify and 1.0.0-beta.27: https://codesandbox.io/s/4jqkrk42j7

If there is a custom component which contains any vuetify component, the custom component cannot be found (Unknown custom element) and therefore is not rendered. Removing the vuetify component will cause the expected rendering.