ansible/test/integration/targets/blockinfile/tasks/insertbefore.yml

- name: Create insertbefore test file
  copy:
    dest: "{{ remote_tmp_dir }}/before.txt"
    content: |
      line1
      line2
      line3      

- name: Add block using insertbefore
  blockinfile:
    path: "{{ remote_tmp_dir }}/before.txt"
    insertbefore: line2
    block: |
      block1
      block2      
  register: after1

- name: Add block using insertbefore again
  blockinfile:
    path: "{{ remote_tmp_dir }}/before.txt"
    insertbefore: line2
    block: |
      block1
      block2      
  register: after2

- name: Stat the before.txt file
  stat:
    path: "{{ remote_tmp_dir }}/before.txt"
  register: after_file

- command: cat {{ remote_tmp_dir }}/before.txt

- name: Ensure insertbefore worked correctly
  assert:
    that:
      - after1 is changed
      - after2 is not changed
      - after_file.stat.checksum == '16681d1d7f29d173243bb951d6afb9c0824d7bf4'