Bug: Spy a function in a function if these 2 functions have been declared in the same vue component

[mattaiod]

Describe the bug
Spying a function in a function in a Vue component if these 2 functions are declared in the same vue file doesn't work.

To Reproduce
Minimum reproduction:
https://github.com/mattaiod/VITEST-cant-spy-fn-in-fn-in-component

Expected behavior
Since I have spied fnInside, when I call fnOutside, fnInside should be called

Related information:

@vue/test-utils: 2.1.0
vitest: 0.23.4
Vue: 3.2.40
node: v16.13.1
pnpm: 7.8.0

[cexbrayat]

@mattaiod I answered in #1798 and I don't think you changed something since then?

Is there anything else we can do to help?

Duplicates #1798

[mattaiod]

@cexbrayat Hi, No it's not a duplication.

In my last issue, it was about mocking a function in a function whereas in this current issue it's about spying a function in a function and know if the inner function was called.

I can imagine the problem is similar though...

[cexbrayat]

@mattaiod Yes, it's exactly the same issue.

[freakzlike]

Spying and mocking is using the same technique by replacing the original function. But this only works for functions which are part of an object and accessible from outside. That's not vue specific and the same thing for common js modules as well.