Support custom folder structures in `wp-config.php` file by schlessera · Pull Request #5460 · wp-cli/wp-cli

@schlessera I pulled & switched to this branch.
And ran composer behat -- features/wp-config.feature

And get 2 errors, I guess unrelated to the problem this should address.

.F------..F----

(::) failed steps (::)

01. Notice: Undefined index: DB_USER in /home/vagrant/wp-cli-dev/wp-cli-tests/features/bootstrap/FeatureContext.php line 559
    In step `And a wp-config-override.php file:'.                                                    # /home/vagrant/wp-cli-dev/wp-cli-tests/features/steps/given.php:48
    From scenario `Default WordPress install with WP_CONFIG_PATH specified in environment variable'. # features/wp-config.feature:3
    Of feature `wp-config'.                                                                          # features/wp-config.feature

02. Notice: Undefined index: DB_USER in /home/vagrant/wp-cli-dev/wp-cli-tests/features/bootstrap/FeatureContext.php line 559
    In step `And a wp-config.php file:'.                                                             # /home/vagrant/wp-cli-dev/wp-cli-tests/features/steps/given.php:48
    From scenario `__FILE__ and __DIR__ in wp-config.php don't point into the PHAR filesystem'.      # features/wp-config.feature:42
    Of feature `wp-config'.  

I'm followed the handbook.
And created the DB & user, I'm running it inside VVV
Am I missing something?