Fix runner for JsTestDriver based tests on OS X #5045
Merged
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This PR introduces two changes:
Background
Only applications compiled for X11 can use Xvfb to run in headless mode, since actually it's not the browsers running in headless mode but the X11 server.
Firefox (or Chrome or Safari) on OS X do not use X11 but Aqua. This means they can not run in headless mode.
It is possible to install Xvfb on OS X using the XQuartz project, but even then the browsers will not use the headless X11 server.
It is possible to compile Firefox on OS X to use X11, but that is quite involved and should not be required to run the JS tests.
Under OS X the JsTestRunner should simply start an instance of Firefox in the background and run the tests.