ansible/test/playbook-changed_when.yml

---
- hosts: all
  connection: local
  gather_facts: False

  tasks:
  - action: command echo first action
  - action: command echo second action
    register: var
    changed_when: "'X' in var.stdout"
  - action: shell exit 2
    register: exit
    ignore_errors: yes
    changed_when: "exit.rc < 1"
  - action: command echo third action
    changed_when: false
  - action: file path=/ state=directory
    changed_when: true
  - action: command echo {{item}}
    register: out
    changed_when: "'e' in out.stdout"
    with_items:
      - hello
      - foo
      - bye