Add transition stub to optimise testing speed in

[itsyme]

Please confirm that you have searched existing issues in the repo

Yes, I have searched the existing issues

Any related issues?

No related issues.

What is the area that this feature belongs to?

Testing

Is your feature request related to a problem? Please describe.

Currently, a setTimeout is being used to handle the transitions when testing the Quiz component in Quiz.spec.js. This was introduced by #2184.

Describe the solution you'd like

A stub could reduce the time taken for testing by removing the time needed for the transition to complete.

Describe alternatives you've considered

No response

Additional context

No response

[itsyme]

After doing some research I found out that it is not possible to create custom Vue transitions stubs that call the Javascript hooks like @after-leave in this case and we would have to use what we have currently to ensure that the @after-leave hook in the transition fires.

Resources:

• Unable to stub transition component vuejs/test-utils#929
• Transition javascript hooks firing? vuejs/vue-test-utils#1603

I've tried using nextTick() and jest.advanceTimersByTime() to replace the use of the timeout but none of them worked as well.

[yucheng11122017]

Chiming in to add that a setTimeout is also used for ScrollTopButton unit test. If this issue can be solved, would be good to change the test cases for that as well