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Manage headless displays with Xvfb (X virtual framebuffer)

License: Other

Python 100.00%

xvfbwrapper's Introduction

xvfbwrapper

Manage headless displays with Xvfb (X virtual framebuffer)

https://travis-ci.org/cgoldberg/xvfbwrapper.svg?branch=master

Info:


About xvfbwrapper:

xvfbwrapper is a python module for controlling virtual displays with Xvfb.


What is Xvfb?:

Xvfb (X virtual framebuffer) is a display server implementing the X11 display server protocol. It runs in memory and does not require a physical display. Only a network layer is necessary.

Xvfb is useful for running acceptance tests on headless servers.


Install xvfbwrapper from PyPI:

pip install xvfbwrapper

System Requirements:

  • X11 Windowing System
  • Xvfb (sudo apt-get install xvfb, yum install xorg-x11-server-Xvfb, etc)
  • Python 2.7 or 3.4+

Examples

Basic Usage:

from xvfbwrapper import Xvfb

vdisplay = Xvfb()
vdisplay.start()

try:
    # launch stuff inside virtual display here.
finally:
    # always either wrap your usage of Xvfb() with try / finally,
    # or alternatively use Xvfb as a context manager.
    # If you don't, you'll probably end up with a bunch of junk in /tmp
    vdisplay.stop()

Basic Usage, specifying display geometry:

from xvfbwrapper import Xvfb

vdisplay = Xvfb(width=1280, height=740)
vdisplay.start()

try:
    # launch stuff inside virtual display here.
finally:
    vdisplay.stop()

Basic Usage, specifying display number:

from xvfbwrapper import Xvfb

vdisplay = Xvfb(display=23)
vdisplay.start()
# Xvfb is started with display :23
# see vdisplay.new_display

Usage as a Context Manager:

from xvfbwrapper import Xvfb

with Xvfb() as xvfb:
    # launch stuff inside virtual display here.
    # Xvfb will stop when this block completes

Testing Example: Headless Selenium WebDriver Tests:

This test class uses selenium webdriver and xvfbwrapper to run test cases on Firefox with a headless display.

import unittest

from selenium import webdriver
from xvfbwrapper import Xvfb


class TestPages(unittest.TestCase):

    def setUp(self):
        self.xvfb = Xvfb(width=1280, height=720)
        self.addCleanup(self.xvfb.stop)
        self.xvfb.start()
        self.browser = webdriver.Firefox()
        self.addCleanup(self.browser.quit)

    def testUbuntuHomepage(self):
        self.browser.get('http://www.ubuntu.com')
        self.assertIn('Ubuntu', self.browser.title)

    def testGoogleHomepage(self):
        self.browser.get('http://www.google.com')
        self.assertIn('Google', self.browser.title)


if __name__ == '__main__':
    unittest.main()
  • virtual display is launched
  • Firefox launches inside virtual display (headless)
  • browser is not shown while tests are run
  • conditions are asserted in each test case
  • browser quits during cleanup
  • virtual display stops during cleanup

Look Ma', no browser!

(You can also take screenshots inside the virtual display to help diagnose test failures)

xvfbwrapper's People

Contributors

alkuzad avatar cgoldberg avatar fuhrysteve avatar gesellc avatar jayakumarc avatar koterpillar avatar miljank avatar moschlar avatar peterdemin avatar pjw91 avatar

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