Image diffing for PrestaShop

How to install your environment

Clone the repository in your local environment :

git clone https://github.com/SimonGrn/imagediff.git
npm i

You MUST disable DEBUG MODE in your PrestaShop administration :

Advanced Parameters > Performance > Debug Mode

You MUST disable the "Gamification" module.

You MUST disable the "Onboarding" module.

You MUST disable the token security in the BO before launching the script. Add this in your .htaccess file:

SetEnv _TOKEN_ disabled

How it works

You first need to make a golden pass by launching the script with the RUN=golden parameter (see below).

These will be your reference screenshots. You can always remake them when you need it by relaunching the script.

After that you just need to launch the script without the RUN=golden parameter, it will crawl every URL, take a screenshot and compare it with your golden ones. Since this script uses mocha you'll get a resume of what went wrong (if any) as a test result for every URL. You'll also get every diff image in the date/diff folder, if there was more difference than the threshold.

The script also generates a JSON file with every information you might need (date, threshold, every URL and its result).

Everything is accessible in a folder named after the current date (ex : imagediff/2019-09-30).

URLs

The urls.js file contains the list of URL to crawl and capture. You can edit it at your convenience.

The structure is pretty clear, the customAction lets you inject code before taking a screenshot (to remove some random elements for example).

Threshold

By default, the script raises an error if there is more than 0 pixels of difference. You can change that by adding the THRESHOLD parameter, and putting an integer value, ex : THRESHOLD=50.

Available command line parameters

Parameter	Values	Description
URL_FO	String	URL of your PrestaShop website Front Office (default to http://localhost/prestashop)
URL_BO	String	URL of your PrestaShop website Back Office (default to ${URL_FO}/admin-dev)
LOGIN	String	LOGIN of your PrestaShop admin (default to demo@prestashop.com)
PASSWD	String	PASSWD of your PrestaShop admin (default to prestashop_demo)
CLIENT_LOGIN	String	Client LOGIN of your PrestaShop Front-Office (default to pub@prestashop.com)
CLIENT_PASSWD	String	Client PASSWD of your PrestaShop Front-Office (default to 123456789)
THRESHOLD	Integer >= 0	Max number of pixels difference (default to 0)
HEADLESS	true/false	Launch Chrome in headless mode (default to true)
RUN	'golden' / empty	Enforce this to golden to create golden screenshots (default to run)