- hosts: all
  tasks:

    - include_role:
        name: update-json-file
      vars:
        update_json_file_name: some/test.json
        update_json_file_default:
          foo: bar
        update_json_file_combine:
          moo: boo
        update_json_file_debug: true

    - include_role:
        name: update-json-file
      vars:
        update_json_file_name: some/test.json
        update_json_file_combine:
          new: content
          a:
            - list
            - of
            - items
        update_json_file_debug: true

    - name: Load resulting merged file
      slurp:
        path: 'some/test.json'
      register: _file

    - name: Parse merged file
      set_fact:
        _config: "{{ _file.content | b64decode | from_json }}"

    - assert:
        that:
          - _config['foo'] == 'bar'
          - _config['moo'] == 'boo'
          - _config['new'] == 'content'
          - _config['a'] == ['list', 'of', 'items']