On error in beforeAll/afterAll relevant information to debug are miss…

[mschaaf]

…ing.

e.g. on Firefox no stack is available, but it can be one constructed if filename and
lineno are available.

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here (e.g. I signed it!) and we'll verify it.

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[googlebot]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.

[johnjbarton]

I will fix the CI to not run on node v6.

[mschaaf]

@johnjbarton Was is missing to get this merged?