add createStub function

[lmiller1990]

Regarding #651

This PR adds a createStub method, which creates a component as such:

const MyComp = createStub("MyComp")

MyComp //=>{ name: "MyComp", render: h => h("div") }

Useful for making it clear what is going on when you call find and findAll.

[eddyerburgh]

I don't think the component needs to have the name child. It should use the constructor. Can you check if the example works for a component without a name?

[38elements]

I think that it is better to add flow type as below.

export default function createStub (name: string): Component {

[eddyerburgh]

Yes, and add // @flow to the top of the file

[lmiller1990]

Got caught up, hopefully by tomorrow can get this done. For TODO:

• add test to use constructor, not name
• add flow to create-stub
• render $slot.default ? for Component stubs should render default slots #658

[eddyerburgh]

Yes the slot default is a good idea. If you'd like you could also add this feature to the default stub rendered in the add-stubs file, so that all default stubs render $slots.

[38elements]

Would you please tell me difference between this feature and a string value in stubs mounting options when the default stub become supporting $slot.default?

[eddyerburgh]

@38elements You can use these stubs for unnamed components without importing the component:

const SomeStub = createStub()
const wrapper = mount(TestComponent, {
  SomeComponent: SomeStub
})

wrapper.find(SomeStub)

Although this will become irrelevant with #651 🤔

[lmiller1990]

Should we just close this since it is more or less super-seeded by #651 ?