- name: Jinja dict to key/value list
  gather_facts: no
  hosts: localhost
  vars: 
    expected: param1=foo,param2=bar
    input:
      param1: foo
      param2: bar
    output: '{{ input.items() | map("join", "=") | sort | join(",") }}'
  tasks:
  - debug:
      var: output
  - assert:
      that:
      - output == expected