Stubs don't behave correctly with augmented options

[strutcode]

Version

1.0.0-beta.29

Reproduction link

https://codepen.io/strutcode/pen/YoGXeW?editors=0010

Steps to reproduce

View the console output

What is expected?

In the console:

Permissions in component-a: some other value
Permissions in component-b: some value

The global mixin should be called with the original component's options

What is actually happening?

In the console:

Permissions in undefined: undefined
Permissions in component-a: some other value
Permissions in component-b: undefined

The mixin is called three times in spite of only two components being in use. The options passed to the stub mixin are filtered unnecessarily.

---

The code base I'm currently working on uses a global mixin that provides a new option for components, but the stubbing functionality of shallowMount is filtering the component options here:

https://github.com/vuejs/vue-test-utils/blob/dev/packages/create-instance/create-component-stubs.js#L37

Is there a purpose to that function? It's causing a considerable number of issues for me in testing.

[ebisbe]

#1564 (comment)