run molecule init to create the role

.travis.yml

+---
+language: python
+python: "2.7"
+
+# Use the new container infrastructure
+sudo: false
+
+# Install ansible
+addons:
+  apt:
+    packages:
+    - python-pip
+
+install:
+  # Install ansible
+  - pip install ansible
+
+  # Check ansible version
+  - ansible --version
+
+  # Create ansible.cfg with correct roles_path
+  - printf '[defaults]\nroles_path=../' >ansible.cfg
+
+script:
+  # Basic role syntax check
+  - ansible-playbook tests/test.yml -i tests/inventory --syntax-check
+
+notifications:
+  webhooks: https://galaxy.ansible.com/api/v1/notifications/
\ No newline at end of file

.yamllint

+---
+# Based on ansible-lint config
+extends: default
+
+rules:
+  braces:
+    max-spaces-inside: 1
+    level: error
+  brackets:
+    max-spaces-inside: 1
+    level: error
+  colons:
+    max-spaces-after: -1
+    level: error
+  commas:
+    max-spaces-after: -1
+    level: error
+  comments: disable
+  comments-indentation: disable
+  document-start: disable
+  empty-lines:
+    max: 3
+    level: error
+  hyphens:
+    level: error
+  indentation: disable
+  key-duplicates: enable
+  line-length: disable
+  new-line-at-end-of-file: disable
+  new-lines:
+    type: unix
+  trailing-spaces: disable
+  truthy: disable

README.md

+Role Name
+=========
+
+A brief description of the role goes here.
+
+Requirements
+------------
+
+Any pre-requisites that may not be covered by Ansible itself or the role should be mentioned here. For instance, if the role uses the EC2 module, it may be a good idea to mention in this section that the boto package is required.
+
+Role Variables
+--------------
+
+A description of the settable variables for this role should go here, including any variables that are in defaults/main.yml, vars/main.yml, and any variables that can/should be set via parameters to the role. Any variables that are read from other roles and/or the global scope (ie. hostvars, group vars, etc.) should be mentioned here as well.
+
+Dependencies
+------------
+
+A list of other roles hosted on Galaxy should go here, plus any details in regards to parameters that may need to be set for other roles, or variables that are used from other roles.
+
+Example Playbook
+----------------
+
+Including an example of how to use your role (for instance, with variables passed in as parameters) is always nice for users too:
+
+    - hosts: servers
+      roles:
+         - { role: username.rolename, x: 42 }
+
+License
+-------
+
+BSD
+
+Author Information
+------------------
+
+An optional section for the role authors to include contact information, or a website (HTML is not allowed).

defaults/main.yml

+---
+# defaults file for iptables

handlers/main.yml

+---
+# handlers file for iptables

meta/main.yml

+galaxy_info:
+  author: your name
+  description: your role description
+  company: your company (optional)
+
+  # If the issue tracker for your role is not on github, uncomment the
+  # next line and provide a value
+  # issue_tracker_url: http://example.com/issue/tracker
+
+  # Choose a valid license ID from https://spdx.org - some suggested licenses:
+  # - BSD-3-Clause (default)
+  # - MIT
+  # - GPL-2.0-or-later
+  # - GPL-3.0-only
+  # - Apache-2.0
+  # - CC-BY-4.0
+  license: license (GPL-2.0-or-later, MIT, etc)
+
+  min_ansible_version: 2.1
+
+  # If this a Container Enabled role, provide the minimum Ansible Container version.
+  # min_ansible_container_version:
+
+  #
+  # Provide a list of supported platforms, and for each platform a list of versions.
+  # If you don't wish to enumerate all versions for a particular platform, use 'all'.
+  # To view available platforms and versions (or releases), visit:
+  # https://galaxy.ansible.com/api/v1/platforms/
+  #
+  # platforms:
+  # - name: Fedora
+  #   versions:
+  #   - all
+  #   - 25
+  # - name: SomePlatform
+  #   versions:
+  #   - all
+  #   - 1.0
+  #   - 7
+  #   - 99.99
+
+  galaxy_tags: []
+    # List tags for your role here, one per line. A tag is a keyword that describes
+    # and categorizes the role. Users find roles by searching for tags. Be sure to
+    # remove the '[]' above, if you add tags to this list.
+    #
+    # NOTE: A tag is limited to a single word comprised of alphanumeric characters.
+    #       Maximum 20 tags per role.
+
+dependencies: []
+  # List your role dependencies here, one per line. Be sure to remove the '[]' above,
+  # if you add dependencies to this list.

molecule/default/INSTALL.rst

+*******
+Delegated driver installation guide
+*******
+
+Requirements
+============
+
+This driver is delegated to the developer.  Up to the developer to implement
+requirements.
+
+Install
+=======
+
+This driver is delegated to the developer.  Up to the developer to implement
+requirements.

molecule/default/converge.yml

+---
+- name: Converge
+  hosts: all
+  tasks:
+    - name: "Include iptables"
+      include_role:
+        name: "iptables"

molecule/default/create.yml

+---
+- name: Create
+  hosts: localhost
+  connection: local
+  gather_facts: false
+  no_log: "{{ molecule_no_log }}"
+  tasks:
+
+    # TODO: Developer must implement and populate 'server' variable
+
+    - when: server.changed | default(false) | bool
+      block:
+        - name: Populate instance config dict
+          set_fact:
+            instance_conf_dict: {
+              'instance': "{{ }}",
+              'address': "{{ }}",
+              'user': "{{ }}",
+              'port': "{{ }}",
+              'identity_file': "{{ }}", }
+          with_items: "{{ server.results }}"
+          register: instance_config_dict
+
+        - name: Convert instance config dict to a list
+          set_fact:
+            instance_conf: "{{ instance_config_dict.results | map(attribute='ansible_facts.instance_conf_dict') | list }}"
+
+        - name: Dump instance config
+          copy:
+            content: |
+              # Molecule managed
+
+              {{ instance_conf | to_json | from_json | to_yaml }}
+            dest: "{{ molecule_instance_config }}"

molecule/default/destroy.yml

+---
+- name: Destroy
+  hosts: localhost
+  connection: local
+  gather_facts: false
+  no_log: "{{ molecule_no_log }}"
+  tasks:
+    # Developer must implement.
+
+    # Mandatory configuration for Molecule to function.
+
+    - name: Populate instance config
+      set_fact:
+        instance_conf: {}
+
+    - name: Dump instance config
+      copy:
+        content: |
+          # Molecule managed
+
+          {{ instance_conf | to_json | from_json | to_yaml }}
+        dest: "{{ molecule_instance_config }}"
+      when: server.changed | default(false) | bool

molecule/default/molecule.yml

+---
+dependency:
+  name: galaxy
+driver:
+  name: delegated
+platforms:
+  - name: instance
+provisioner:
+  name: ansible
+verifier:
+  name: ansible

molecule/default/verify.yml

+---
+# This is an example playbook to execute Ansible tests.
+
+- name: Verify
+  hosts: all
+  gather_facts: false
+  tasks:
+  - name: Example assertion
+    assert:
+      that: true

tasks/main.yml

+---
+# tasks file for iptables

tests/inventory

+localhost
+

tests/test.yml

+---
+- hosts: localhost
+  remote_user: root
+  roles:
+    - iptables

vars/main.yml

+---
+# vars file for iptables