Needle is a tool for testing your CSS with Selenium and nose.

It checks that CSS renders correctly by taking screenshots of portions of a website and comparing them against known good screenshots. It also provides tools for testing calculated CSS values and the position of HTML elements.

This is what a Needle test case looks like:

from needle.cases import NeedleTestCase

class BBCNewsTest(NeedleTestCase):
    def test_masthead(self):
        self.driver.get('http://www.bbc.co.uk/news/')
        self.assertScreenshot('#blq-mast', 'bbc-masthead')

This example checks for regressions in the appearance of the BBC's masthead.

Full documentation is on Read the Docs.

$ nosetests