When xdebug client is not active, functional test error message doesn't print to console.

[skyred]

With the current version (running phpunit as www-data and standard error path is set):

If xdebug client is not active/turn on, then the error message doesn't print to console as well as /var/log/php_error.log. Instead, xdebug warning like:

Xdebug: [Step Debug] Could not connect to debugging client. Tried: host.docker.internal:9003 (fallback through xdebug.client_host/xdebug.client_port) :-(

is printed to both console and /var/log/php_error.log

Comparing to:

• If xdebug client is active, then functional test error message prints fine, break points also work well
• If the test is kernel, then the error message prints fine no matter if the xdebug client is active or not.

Workaround for now:

1. Turn on xdebug client, set or unset breakpoints would work. Easy.
2. Turn off xdebug serve side in the container (';xdebug.mode=debug' in /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini), but this would debugging functional test from working.