ansible/test/integration/targets/roles/no_dupes.yml

- name: play should only show 1 invocation of a, as dependencies in this play are deduped
  hosts: testhost
  gather_facts: false
  tags: [ 'inroles' ]
  roles:
    - role: a
    - role: b
    - role: c

- name: play should only show 1 invocation of a, as dependencies in this play are deduped even outside of roles
  hosts: testhost
  gather_facts: false
  tags: [ 'acrossroles' ]
  roles:
    - role: a
    - role: b
  tasks:
    - name: execute role c which depends on a
      import_role: name=c
Prevent duplicate role insertion into roles: (#50552) * Corner case in which import_role would add another instance of a role with the same signature into roles: when it already existed there. roles: - name: a tasks: - import_role: name=a would execute role 'a' 3 times instead of the intended 2 (x2 in roles: phase +1 in tasks:) * added tests 6 years ago			`- name: play should only show 1 invocation of a, as dependencies in this play are deduped`
			`hosts: testhost`
			`gather_facts: false`
			`tags: [ 'inroles' ]`
			`roles:`
			`- role: a`
			`- role: b`
			`- role: c`

			`- name: play should only show 1 invocation of a, as dependencies in this play are deduped even outside of roles`
			`hosts: testhost`
			`gather_facts: false`
			`tags: [ 'acrossroles' ]`
			`roles:`
			`- role: a`
			`- role: b`
			`tasks:`
			`- name: execute role c which depends on a`
			`import_role: name=c`