Bug: KeepAlive usage will give a "Non-function value encountered for default slot" warning

[laddi-netapp]

Describe the bug
It's really simple, any component that uses <keep-alive> around dynamic components will trigger this warning:

[Vue warn]: Non-function value encountered for default slot. Prefer function slots for better performance.
  at <KeepAlive>

To Reproduce
Create a component that has dynamic components surrounded by <keep-alive>. Add any test for it and observe the warning during shallowMount rendering. Warning goes away as soon as the <keep-alive> tags are removed or using full mount.

Expected behavior
Would expect this to behave exactly the same as Teleport, i.e. no warning shown in the console and being able to globally mock KeepAlive in a similar way.

Related information:

• @vue/test-utils version: 2.2.3
• Vue version: 3.2.44
• node version: 18.12.1
• yarn version: 1.22.19

[cexbrayat]

Hi @laddi-netapp

Thanks for the report. Yeah I gues we need to have the same workaround that I introduced in #1833 for KeepAlive

Would you be interested in trying to open a PR to fix this issue? We would gladly review and merge it.

[laddi-netapp]

I'll give it a try, might be fun! 😄

[cexbrayat]

This has been fixed by #1888 and #1889

Thanks @laddi-netapp 👍