Visual diff tests for Python

Automate chrome browser render diffs for website testing

Featuring Puppeteer, headless Chrome and Python image diffing

Installation

pip install visualdiff

Usage

Create your tests calling visualdiff.compare(url), this will drive a headless Chrome session rendering the desired URL and comparing the resulting image with an expected one.

The expectation are stored by default in a visualdiff subfolder of the current calling test script.

There are several additional options you can use, we'll see them in the examples

Examples

import visualdiff as vd

assert not vd.difference('https://example.com')

Credits:

• It is a long time that I wanted a tool like this one, but thanks to this article from Monica Dinculescu for finally convincing me.
• Thanks to Mijakogi for the outstanding work on Pyppeteer