Find by component

[dobromir-hristov]

This PR allows finding a Vue Component and returning a new VueWrapper with it's instance.

Caveats:

• Returns only Vue components, and works only on VueWrapper.
• You cant chain it from a DOMWrapper
• setProps does not work on newly wrapped instances, from FindComponent. (which is fine)

Reasoning behind this

Many codebases use Components, Ref or Name to search for Vue instances, when doing tricky assertions, or mounting shallow.

[lmiller1990]

woah, awesome job @dobromir-hristov !

I will play with this a bit tonight and see if I can find any bugs. Looks solid, very impressive that you managed to port the entire find api. having a separate findComponent method definitely feels like a big improvement.

[lmiller1990]

This is great work @dobromir-hristov

• I don't fully understand how all of find works. That's fine - it seems like it works and the test appear to cover all the edge cases. Excellent work!
• Can we do find(Foo).$emit with this implementation?
• using the same resolveComponent algo from Vue core is very smart.
• As commented I am not a fan of mutating this with __emitted. Mutation and side effects are one of the reasons VTU beta was so buggy. Unless there is a strong eason for this refactor (eg, the original implementation doesn't cover an edge case) I'm not really in favor. If there is a reason, please explain - happy to change my mind with the right argument :)
• you have some merge conflicts.

All in all I am very excited to merge this feature up and I think a lot of people will be excited for it.

[dobromir-hristov]

1. What part of find do you not get? Let me try to explain :)
2. We can do find(Comp).vm.$emit.

[lmiller1990]

I think I need to use a debugger a bit and play around. Will ask if I still can't understand it.

If we can revert that one mixin (top level) happy to merge this up.

Awesome we can do vm.$emit should be very few breaking changes! Your codebase should upgrade easily.

[lmiller1990]

great!

[lmiller1990]

Let's resolve this conflict and merge this up, I think a lot of people are waiting for this feature :D