/test/integration/test_hash.yml

 1---
 2- hosts: testhost
 3  vars_files:
 4    - vars/test_hash_vars.yml
 5  vars:
 6    test_hash:
 7      playbook_vars: "this is a playbook variable"
 8    replaced_hash:
 9      extra_args: "this is an extra arg"
10    merged_hash:
11      default_vars: "this is in role default/main.yml"
12      extra_args: "this is an extra arg"
13      group_vars_all: "this is in group_vars/all"
14      host_vars_testhost: "this is in host_vars/testhost"
15      playbook_vars: "this is a playbook variable"
16      role_argument: "this is a role argument variable"
17      role_vars: "this is in role vars/main.yml"
18      vars_file: "this is in a vars_file"
19  roles:
20  - { role: test_hash_behavior, test_hash: {'role_argument':'this is a role argument variable'} }