JS tests failing on CI

[LukasReschke]

Seems related to karma-runner/karma-phantomjs-launcher#126

[LukasReschke]

Let's just migrate away from the PhantomJS launcher and switch to headless Chrome instead: karma-runner/karma-chrome-launcher#111

[ChristophWurst]

Ouch. This is bad. Headless Chrome doesn't qualify for a short-term solution as that PR has not been merged.

[ChristophWurst]

cc @nextcloud/javascript

[LukasReschke]

@MorrisJobke mentioned that pinning Karma 1.5.x might make sense as a temporary workaround.

[MorrisJobke]

I thought it is because the dependencies has changed, so I looked it up and this is the diff between working and not working:

That means we should check if pinning jasmine-core helps.

[MorrisJobke]

"Fix" is in #4494

Nevertheless we should migrate to the other launcher if this is the only option. 🙈