ansible/test/integration/targets/cache-plugins/inspect_cache.yml

- hosts: localhost
  gather_facts: no
  tasks:
    - name: test that the cache only contains the set_fact var
      assert:
        that:
          - ansible_facts | length == 1
          - ansible_facts.foo == 'bar'
          - ansible_facts.foo is ansible._protomatter.tagged_with "Origin"
      tags:
        - set_fact

    - name: test that the cache contains gathered facts and the var
      assert:
        that:
          - ansible_facts | length  > 1
          - ansible_facts.foo == 'bar'
          - ansible_facts.distribution is defined
          - ansible_facts.foo is ansible._protomatter.tagged_with "Origin"
      tags:
        - additive_gather_facts

    - name: test that the cache contains only gathered facts
      assert:
        that:
          - ansible_facts | length > 1
          - ansible_facts.foo is undefined
          - ansible_facts.distribution is defined
      tags:
        - gather_facts