andreastt

A datapoint is that we have not had many deviations in results between Xvfb and headless mode in the Firefox CI, as https://searchfox.org/mozilla-central/search?q=headless&case=false&regexp=false&path=testing%2Fmarionette%2Fharness%2F**%2F*.py shows. To the contrary, running Firefox in...

I filed https://bugzilla.mozilla.org/show_bug.cgi?id=1434382 about a wptrunner `--headless` flag some time ago, but maybe a GitHub issue would’ve been better.

@foolip For the functional Marionette tests, all tests are expected to pass unless marked to skip, so we only have one test for the remote protocol that we can’t get...

Just out of curiosity, I would be interested to know how Firefox fares in that experiment. Setting `MOZ_HEADLESS=1` in the environment should be sufficient.

> I'll give it a shot, @andreastt . Is setting MOZ_HEADLESS=1 different > than using the -headless flag? They are equivalent.

Can you include `--webdriver-arg=-vv` in that?

Depending on what version of Firefox you’re using, you need to set the preference in the correct case. Since recently, Nightly only supports `Trace` (capital T). The log does say...

Yes, regrading the log pref casing I was misremembering events. The casing shouldn’t matter. Also the debug log shows `enable=false` which does indeed mean Marionette is not getting enabled. >...

If we want to use a real WM I’d suggest something along the lines of this: xvfb-run --auto-servernum --server-args '-ac -screen 0 1024x768x24' \ openbox --startup '/home/ato/src/gecko/mach wpt /home/ato/src/gecko/testing/web-platform/tests/webdriver' But...

WebDriver tests from WPT run fine in the Firefox CI and upstream using the `wpt` helper.