There is something seriously messed up with the xpcshell tests. The gdata tests are passing without trouble (if the remaining build works), but there is an obvious mistake: https://dxr.mozilla.org/comm-central/source/calendar/test/unit/test_gdata_provider.js#472 The function creates dt but never returns it. Also, just equal() should fail there since deepEqual() is required, and Services.prefs.getCharPref() might throw because the timezone is not set. resetTo() with an invalid timezone should throw NS_ERROR_UNEXPECTED. When running this on my machine, I also got dateToJSON is not defined for some reason, they only way to fix that was to import into an object instead of the global. Even with making seemingly unnecesary code changes, I couldn't get the whole test to fully pass, the last I got was: Unexpected exception 3253927937 undefined exiting test

Update: I have a fix for the dateToJSON test, but the tests accessing the fakeserver are also failing hard. At the second getClient call, the sync hangs somewhere during the async copying of the response of the last http request.

Next update, I've gotten almost all tests running locally. I needed to reset the fakeserver after each request, if more than a few requests are made then the test hangs. I'm still having errors every few test runs, therefore I started a try run to see if it is just my machine.

Ok, this is a waste of time. I'm giving up for now. Latest try build here: https://treeherder.mozilla.org/#/jobs?repo=try-comm-central&revision=892457c7638a