Add default events object to shallow wrapper simulate

[danielhusar]

Hey,

I had to pass preventDefault mock lot of times to simulate event in shallow rendering, so I thought it would be nice to have it by default there.

Fixes: #277

[danielhusar]

It failed on old node's because of jsdom not working there :(

[ljharb]

window is not available when shallow-wrapping.

[danielhusar]

Don't most users have it available when running tests ?
I know its not requirement for shallow rendering, but are there many people that use only shallow rendering ?

Optionally I was thinking to add jsdom there but introducing this as dependency is probably not good idea.

Maybe just hardcode some event object with most used properties ?

[ljharb]

No. Many users do not use mount at all and do not have the DOM available during tests.

shallow must not require or assume a browser environment.

[danielhusar]

👍 So what would be better approach ? Check for global.window and add it only for users that have it exposed ? (Leads to inconsistency)
Or create manually event object ? (Don't think so we can mock properly all properties)

[ljharb]

Manually create an event object. The behavior of shallow should not differ based on the presence or absence of browser globals.

[blainekasten]

I feel like something I would rather see is a mocking event object in enzyme that I can pass to simulate.

Something like this:

wrapper.simulate('click', enzyme.mockEvent);

And that is effectively an object that represents the shape of a typical event.

[lelandrichardson]

We definitely cannot rely on browser APIs for shallow.

I would love to see a well built event mocking system built for enzyme that would remove some of the boilerplate, but I hesitate to add something that only implements it half-way - which we would then have to have a potential additional breaking change for in the future.

[lelandrichardson]

I'm going to close this in favor of #368 which I think is going more closely in the direction that we want, but I believe will accomplish everything you are wanting.

Thanks!