ansible/test/integration/targets/delegate_to/verify_interpreter.yml

- name: ensure they are different
  hosts: localhost
  tasks:
    - name: dont game me
      assert:
        msg: 'expected different values but got ((hostvars["testhost"]["ansible_python_interpreter"]}} and {{hostvars["testhost2"]["ansible_python_interpreter"]}}'
        that:
           - hostvars["testhost"]["ansible_python_interpreter"] != hostvars["testhost2"]["ansible_python_interpreter"]

- name: no delegation
  hosts: all
  gather_facts: false
  tasks:
    - name: detect interpreter used by each host
      detect_interpreter:
      register: baseline

    - name: verify it
      assert:
        msg: 'expected {{ansible_python_interpreter}} but got {{baseline.found|basename}}'
        that:
           - baseline.found|basename == ansible_python_interpreter

- name: actual test
  hosts: testhost
  gather_facts: false
  tasks:
    - name: original host
      detect_interpreter:
      register: found

    - name: verify it orig host
      assert:
        msg: 'expected {{ansible_python_interpreter}} but got {{found.found|basename}}'
        that:
           - found.found|basename == ansible_python_interpreter

    - name: delegated host
      detect_interpreter:
      register: found2
      delegate_to: testhost2

    - name: verify it delegated
      assert:
        msg: 'expected {{hostvars["testhost2"]["ansible_python_interpreter"]}} but got {{found2.found|basename}}'
        that:
           - found2.found|basename == hostvars["testhost2"]["ansible_python_interpreter"]