Testing

Error N°1 : PHPunit not found

If uou have a message like : Add Phpunit via composer

CAUTION : PHPunit Version >= 8 is not compatable with drupal, so use the 7

composer require --dev phpunit/phpunit:7

To test retina display, just adjust the screen pixel ratio.

SimpleTest (Testing) allow to test your drupal systems in a safe way. It's also allow you to check functionaleties, result ... of your module.

First of all you must active Testing module on your envirenement.
#Drush command:
drush en simpletest -y

Initialisation - Create link to the script (Optional).

ln -s core/scripts/run-tests.sh ~/bin

Run Test and open rest in web browser.

php core/scripts/run-tests.sh --browser --class "Drupal\YOUR_MODULE\Tests\JustTest"

Drupal Tutorial : https://www.drupal.org/simpletest