ansible/test/integration/targets/ignore_unreachable/test_cannot_connect.yml

---
- hosts: localhost
  gather_facts: false
  tasks:
    - name: Hi
      ping:
- hosts: [localhost, nonexistent]
  ignore_unreachable: true
  gather_facts: false
  tasks:
    - name: Hi
      ping:
- hosts: nonexistent
  ignore_unreachable: true
  gather_facts: false
  tasks:
    - name: Hi
      ping:
    - name: This should print anyway
      debug:
        msg: This should print worked even though host was unreachable
    - name: Hi
      ping:
      register: should_fail
    - assert:
        that:
          - 'should_fail is unreachable'
          - 'not (should_fail is skipped)'
          - 'not (should_fail is failed)'