ansible/test/integration/targets/error_from_connection/play.yml

- hosts: testhost
  gather_facts: false
  tasks:
    - name: "use a connection plugin raising an exception, exception message contains Jinja template."
      connection: dummy
      command: /bin/true  # command won't be executed
      register: result
      ignore_errors: True

    - name: "check that Jinja template embedded in exception message isn't rendered"
      debug:
        msg: 'ok'
      when: result is failed
      register: debug_task

    - assert:
        that:
          - result is failed
          - "'an error with' in result.msg"  # makes sure plugin was found
          - debug_task is success