community.general/tests/integration/targets/interfaces_file/tasks/main.yml

---
- name:
  set_fact:
    interfaces_testfile: '{{ remote_tmp_dir }}/interfaces'

- name: Copy interfaces file
  copy:
    src: 'files/interfaces_ff'
    dest: '{{ interfaces_testfile }}'

- name: Change IP address to 1.2.3.5
  community.general.interfaces_file:
    dest: "{{ interfaces_testfile }}"
    iface: eno1
    option: address
    value: 1.2.3.5
  register: ifile_1

- assert:
    that:
    - ifile_1 is changed

- name: Change IP address to 1.2.3.5 again
  community.general.interfaces_file:
    dest: "{{ interfaces_testfile }}"
    iface: eno1
    option: address
    value: 1.2.3.5
  register: ifile_2

- assert:
    that:
    - ifile_2 is not changed