Adding a "test role again"

.travis.yml

@@ -43,6 +43,9 @@ script:
   # Test role.
   - 'sudo docker exec --tty "$(cat ${container_id})" env TERM=xterm ansible-playbook /etc/ansible/roles/role_under_test/tests/${playbook}'
 
+  # Test role again.
+  - 'sudo docker exec --tty "$(cat ${container_id})" env TERM=xterm ansible-playbook /etc/ansible/roles/role_under_test/tests/${playbook}'
+
   # Test role idempotence.
   - >
     sudo docker exec "$(cat ${container_id})" ansible-playbook /etc/ansible/roles/role_under_test/tests/${playbook}