ansible/test/integration/targets/collections/inventory_test.yml

- name: test a collection-hosted connection plugin against hosts from collection-hosted inventory plugins
  hosts: dynamic_host_a, dynamic_host_redirected
  gather_facts: no
  vars:
    ansible_connection: testns.testcoll.localconn
    ansible_localconn_connectionvar: from_play
  tasks:
  - raw: echo 'hello world'
    register: connection_out

  - assert:
      that:
      - connection_out.stdout == "localconn ran echo 'hello world'"
      # ensure that the connection var we overrode above made it into the running config
      - connection_out.stderr == "connectionvar is from_play"


- hosts: localhost
  gather_facts: no
  tasks:
  - assert:
      that:
      - hostvars['dynamic_host_a'] is defined
      - hostvars['dynamic_host_a'].connection_out.stdout == "localconn ran echo 'hello world'"
      - hostvars['dynamic_host_redirected'] is defined
      - hostvars['dynamic_host_redirected'].connection_out.stdout == "localconn ran echo 'hello world'"