Prop declared in mixin is not recognized when using shallowMount

[lusarz]

Version

1.0.0-beta.28

Reproduction link

https://github.com/lusarz/vue-test-utils-examples/commit/1ab138962e9530d24381bad22f411abd9a488093

Steps to reproduce

• create child component that use mixin with prop declared inside it
• use child component in parent component
• create test which checks if child has appropriate props passed, using shallowMount

What is expected?

Prop has appropriate value

What is actually happening?

Prop is undefined

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When I either use mount or declare props directly in child component everything works

[eddyerburgh]

Thanks for the bug report. This is a duplicate of #1094 so I'm closing this in favor of #1094