You can use PyVirtualDisplay (a Python wrapper for Xvfb) to run headless WebDriver tests.
#!/usr/bin/env python
from pyvirtualdisplay import Display
from selenium import webdriver
display = Display(visible=0, size=(800, 600))
display.start()
# now Firefox will run in a virtual display.
# you will not see the browser.
browser = webdriver.Firefox()
browser.get('http://www.google.com')
print browser.title
browser.quit()
display.stop()
You can also use xvfbwrapper, which is a similar module (but has no external dependencies):
from xvfbwrapper import Xvfb
vdisplay = Xvfb()
vdisplay.start()
# launch stuff inside virtual display here
vdisplay.stop()
or better yet, use it as a context manager:
from xvfbwrapper import Xvfb
with Xvfb() as xvfb:
# launch stuff inside virtual display here.
# It starts/stops in this code block.