duplicate config/autoload/local.php.dist
as config/autoload/local.php
duplicate config/autoload/mail.local.php.dist
as config/autoload/mail.local.php
if your Admin will send emails, make sure to fill in SMTP connection params
config/autoload/local.test.php.dist
as config/autoload/local.test.php
this creates a new in-memory database that your tests will run on.