ansible/test/integration/targets/docker_network/tasks/tests/substring.yml

---
- name: Registering container and network names
  set_fact:
    nname_1: "{{ name_prefix ~ '-network-foo' }}"
    nname_2: "{{ name_prefix ~ '-network-foobar' }}"
- name: Registering container and network names
  set_fact:
    dnetworks: "{{ dnetworks + [nname_1, nname_2] }}"

####################################################################

- name: Create network (superstring)
  docker_network:
    name: "{{ nname_2 }}"
    state: present
  register: networks_1

- name: Create network (substring)
  docker_network:
    name: "{{ nname_1 }}"
    state: present
  register: networks_2

- name: Cleanup
  docker_network:
    name: "{{ network_name }}"
    state: absent
  loop:
  - "{{ nname_1 }}"
  - "{{ nname_2 }}"
  loop_control:
    loop_var: network_name

- assert:
    that:
    - networks_1 is changed
    - networks_2 is changed