ansible.utils/tests/integration/targets/index_of/tasks/main.yaml

---
- name: Recursively find all test files
  find:
    file_type: file
    paths: "{{ role_path }}/tasks/include"
    recurse: true
    use_regex: true
    patterns:
      - '^(?!_).+$'
  register: found

- include: "{{ item.path }}"
  loop: "{{ found.files }}"