Problem with beforeRouteUpdate in-Component Guard Test

[BerniWittmann]

Version

3.0.1

Reproduction link

https://github.com/BerniWittmann/vue-test-navigation-guard-reproduction

Steps to reproduce

Run the tests with npm run test:unit

What is expected?

The specs in tests/unit/Home.spec.js should pass and calling wrapper.vm.beforeRouteUpdate should call the component navigation guard beforeRouteUpdate

What is actually happening?

The specs fail, because wrapper.vm.beforeRouteUpdate yiels undefined

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I already asked a question on stackoverflow (without any solution). After providing the minimal reproduction this appears to be a bug, that only happens with mocha chai (and maybe karma jasmine) , but not with jest

[posva]

I don't know what may be causing this but I would say it's not on Vue router's side.
If you want to acces the beforeRouteUpdate hook, you will need to go through vm.$options.beforeRouteUpdate