Starting with Drupal 8.8, a database connection seems to be needed even for unit tests

[alberto56]

In Start unit testing your Drupal and other PHP code today, October 16, 2019, Dcycle Blog I recommend using this to run tests as would the Drupal testbot. However starting with Drupal 8.8, I'm getting

Next PDOException: SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known in     /var/www/html/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php:416
Stack trace:
#0 /var/www/html/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php(416): PDO->__construct('mysql:host=mysq...', 'root', '', Array)

which signals that a database is required even for unit tests. Until this issue is fixed this project is unusable. I recommend using CircleCI or a the technique in the above article which does not require the Drupal infrastructure.

[alberto56]

See https://circleci.com/gh/dcycle/expose_status/13 for an example.

[alberto56]

A workaround is to install https://github.com/dcycle/starterkit-drupal8site and then run:

docker-compose exec drupal /bin/bash -c 'drush en -y simpletest && php core/scripts/run-tests.sh my-test-group'