Requires In-Commerce module installed to test.
# enable debug mode
# In `gc` unit (file: `modules/in-commerce/units/gift_certificates/gift_certificates_config.php`) add `'show_mode' => smDEBUG` to section's `in-commerce:gift-certificates` definition
# go to {nav E-commerce > Discounts & Certificates} section and confirm that `Gift Certificates` tab is visible
# disable debug mode
# go to {nav E-commerce > Discounts & Certificates} section and confirm that `Gift Certificates` tab is not visible