ansible-playbook 2.9.27
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible-playbook
  python version = 2.7.5 (default, Nov 14 2023, 16:14:06) [GCC 4.8.5 20150623 (Red Hat 4.8.5-44)]
Using /etc/ansible/ansible.cfg as config file
Skipping callback 'actionable', as we already have a stdout callback.
Skipping callback 'counter_enabled', as we already have a stdout callback.
Skipping callback 'debug', as we already have a stdout callback.
Skipping callback 'dense', as we already have a stdout callback.
Skipping callback 'dense', as we already have a stdout callback.
Skipping callback 'full_skip', as we already have a stdout callback.
Skipping callback 'json', as we already have a stdout callback.
Skipping callback 'minimal', as we already have a stdout callback.
Skipping callback 'null', as we already have a stdout callback.
Skipping callback 'oneline', as we already have a stdout callback.
Skipping callback 'selective', as we already have a stdout callback.
Skipping callback 'skippy', as we already have a stdout callback.
Skipping callback 'stderr', as we already have a stdout callback.
Skipping callback 'unixy', as we already have a stdout callback.
Skipping callback 'yaml', as we already have a stdout callback.

PLAYBOOK: tests_default.yml ****************************************************
1 plays in /tmp/collections-NtO/ansible_collections/fedora/linux_system_roles/tests/postfix/tests_default.yml

PLAY [Ensure that the rule runs with default parameters] ***********************
META: ran handlers

TASK [Run the postfix role] ****************************************************
task path: /tmp/collections-NtO/ansible_collections/fedora/linux_system_roles/tests/postfix/tests_default.yml:6
ERROR! the role 'fedora.linux_system_roles.postfix' was not found in /tmp/collections-NtO/ansible_collections/fedora/linux_system_roles/tests/postfix/roles:/root/.ansible/roles:/usr/share/ansible/roles:/etc/ansible/roles:/tmp/collections-NtO/ansible_collections/fedora/linux_system_roles/tests/postfix

The error appears to be in '/tmp/collections-NtO/ansible_collections/fedora/linux_system_roles/tests/postfix/tests_default.yml': line 8, column 15, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

      include_role:
        name: fedora.linux_system_roles.postfix
              ^ here

PLAY RECAP *********************************************************************