- hosts: localhost
  gather_facts: false
  vars:
    output_dir: "{{ lookup('env', 'OUTPUT_DIR') }}"
    var_a: "value"
    var_b: "{{ var_a }}"
    var_c: "<< var_a >>"
  tasks:
    - set_fact:
        var_d: "{{ var_a }}"

    - template:
        src: in_template_overrides.j2
        dest: '{{ output_dir }}/in_template_overrides.out'

    - template:
        src: arg_template_overrides.j2
        dest: '{{ output_dir }}/arg_template_overrides.out'
        variable_start_string: '<<'
        variable_end_string: '>>'

    - command: cat '{{ output_dir }}/in_template_overrides.out'
      register: in_template_overrides_out

    - command: cat '{{ output_dir }}/arg_template_overrides.out'
      register: arg_template_overrides_out

    - assert:
        that:
          - "'var_a: value' in in_template_overrides_out.stdout"
          - "'var_b: value' in in_template_overrides_out.stdout"
          - "'var_c: << var_a >>' in in_template_overrides_out.stdout"
          - "'var_d: value' in in_template_overrides_out.stdout"

          - "'var_a: value' in arg_template_overrides_out.stdout"
          - "'var_b: value' in arg_template_overrides_out.stdout"
          - "'var_c: << var_a >>' in arg_template_overrides_out.stdout"
          - "'var_d: value' in arg_template_overrides_out.stdout"