Hey Mike,
according to our code coverage report, nsAutoConfig is never executed during 
tests.

As far as I can see, it is actually not tested, as the test you mentioned is 
not setting the autoadmin.global_config_url pref that would make nsReadConfig 
instantiate nsAutoConfig. Is that correct?

I'd like to understand whether this is a problem in our coverage collection 
tools that are not picking up this file for some reason or if it actually is 
not tested. I've opened https://bugzilla.mozilla.org/show_bug.cgi?id=1413600.

- Marco.

On Tuesday, October 31, 2017 at 4:22:06 PM UTC+1, mka...@mozilla.com wrote:
> On Tuesday, October 31, 2017 at 12:10:21 AM UTC-5, Nicholas Nethercote wrote:
> > Hi,
> > 
> > I was just looking at the extensions/pref/autoconfig/ directory and trying
> > to understand what it does.
> > 
> > As far as I can tell, the code is there to allow custom deployments with
> > particular prefs set, as described at
> > https://developer.mozilla.org/en-US/Firefox/Enterprise_deployment#Configuration
> > 
> > It's initialized by modules/libpref/Preferences.cpp if a
> > "general.config.filename" pref is found:
> > http://searchfox.org/mozilla-central/rev/1ebd2eff44617df3b82eea7d2f3ca1b60cc591a0/modules/libpref/Preferences.cpp#3907-3920
> > 
> > There is also some MozHarness code relating to it here:
> > http://searchfox.org/mozilla-central/source/testing/mozharness/mozharness/mozilla/firefox/autoconfig.py
> > 
> > Just to check: is this still supported functionality?
> > 
> > Thanks.
> > 
> > Nick
> 
> Yes, this is very much supported functionality. It is our primary means of 
> enterprise customization right now.
> 
> The reason there are very few tests is because when it was first developed, 
> it wasn't possible to write tests that involved putting down files before 
> startup. There are some tests now:
> 
> http://searchfox.org/mozilla-central/source/extensions/pref/autoconfig/test/unit
> 
> Mike Kaply

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