It help us see things that cannot be seen with our mortal eyes.
You will need to have Node.js installed.
Install using npm
$ npm install -g barong
$ npm install -g casperjs
$ npm install -g slimerjs
This will install barong, casperjs and slimerjs globally.
First thing to do is, you need to create the configuration files. You can use barong init to create a sample configuration file.
$ barong init
Config initilized. We've included some sample config file for you to start with.
barong.json your main config file
scenarios/
capture-selector.json capture with css selector
capture-region.json capture with custom region clip
custom-viewport.json change viewport size
action-hover.json do hover before capture
action-click.json do click before capture
This will create the main config file (barong.json) and some sample scenarios (scenarios/*).
After you adjust the config file, you can start creating the reference files, by doing:
$ barong capture [config]
This will run through all your scenarios configuration and do the captures.
After creating the reference files, you can start capture the the pages that you want to compare, by doing:
$ barong test [config]
After capturing files based on all scenarios, it will open a page to show the result.