Stencil version:

 @stencil/core@2.5.2

I'm submitting a:

[ ] bug report
[X] feature request
[ ] support request => Please do not submit support requests here, use one of these channels: https://stencil-worldwide.herokuapp.com/ or https://forum.ionicframework.com/

Current behavior:
Tests are working with jest 26.
You cannot upgrade to jest 27 since you get jasmine is not defined.
Setting up testRunner: 'jest-jasmine2' in the configuration to retain old jasmine does not help either and throws Cannot read property 'rootDir' of undefined.

Expected behavior:
For the upcoming stencil 2.6, would it be possible to support jest 27?

Steps to reproduce:
Upgrade jest and jest-cli to 27. Try running tests.