---
- name: Tests machine connections via Ansible Tower/Ansible Automation Platform
  hosts: all
  gather_facts: no
  become: no


  vars:
    # These vars are used to purposefully fail a node
    fail_host    : "{{ tower_fail_host    | default('no') }}"
    host_to_fail : "{{ tower_host_to_fail | default('lab-prod-1') }}"


  tasks:
    - name: "Test #1 - whoami"
      command      :
        cmd        : whoami
      changed_when : no
      register     : r_cmd_whoami


    - name: "Results #1 - whoami"
      debug:
        msg:
          - "rc     : {{ r_cmd_whoami.rc }}"
          - "stdout : {{ r_cmd_whoami.stdout }}"
          - "stderr : {{ r_cmd_whoami.stderr }}"


    - name: "Test #2 - induce failure (but only for a specified host)"
      command:
        cmd: /bin/false
      when:
        - fail_host | bool and inventory_hostname == host_to_fail

...