test: demonstrate setProps bug through computed and created (#738)

[agriffis]

No description provided.

[eddyerburgh]

Thanks for the bug repro!

This is a bug with the synchronous implementation that changed in beta.16 (#676).

This is a very serious issue that I'm focussed on fixing.

The solution at the moment (and possibly the long term solution) is to run the tests without sync mode:

it('sets component prop referenced through computed and created', () => {
  const wrapper = mountingMethod(ComponentWithComputedCreated, {propsData: {prop1: 1}, sync: false})
  wrapper.setProps({prop1: 2})
  setTimeout(() => {
    expect(wrapper.vm.prop1).to.equal(2)
  })
}) 

[agriffis]

@eddyerburgh Just for kicks, I rebased this to latest and it's great to see it works!

[leifriksheim]

In my case using setTimeout will make all test pass, even if they shouldn't

[eddyerburgh]

This should be fixed in beta.29