init

molecule/default/Dockerfile.j2

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+FROM {{ item.image }}
+RUN /bin/sh -c 'apt-get update && apt-get upgrade -y && apt-get install -y python sudo bash'

molecule/default/create.yml

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+---
+- name: Setup
+  hosts: localhost
+  connection: local
+  gather_facts: False
+  no_log: "{{ not lookup('env', 'MOLECULE_DEBUG') | bool }}"
+  vars:
+    molecule_file: "{{ lookup('env', 'MOLECULE_FILE') }}"
+    molecule_ephemeral_directory: "{{ lookup('env', 'MOLECULE_EPHEMERAL_DIRECTORY') }}"
+    molecule_scenario_directory: "{{ lookup('env', 'MOLECULE_SCENARIO_DIRECTORY') }}"
+    molecule_yml: "{{ lookup('file', molecule_file) | from_yaml }}"
+  tasks:
+    - name: Create Dockerfiles from image names
+      template:
+        src: "{{ molecule_scenario_directory }}/Dockerfile.j2"
+        dest: "{{ molecule_ephemeral_directory }}/Dockerfile_{{ item.image | regex_replace('[^a-zA-Z0-9_]', '_') }}"
+      with_items: "{{ molecule_yml.platforms }}"
+      register: platforms
+
+    - name: Build an Ansible compatible image
+      docker_image:
+        path: "{{ molecule_ephemeral_directory }}"
+        name: "molecule_local/{{ item.item.image }}"
+        dockerfile: "{{ item.item.dockerfile | default(item.invocation.module_args.dest) }}"
+        force: "{{ item.item.force | default(True) }}"
+      with_items: "{{ platforms.results }}"
+      when: platforms.changed
+
+    - name: Create molecule instance(s)
+      docker_container:
+        name: "{{ item.name }}"
+        hostname: "{{ item.name }}"
+        image: "molecule_local/{{ item.image }}"
+        state: started
+        recreate: False
+        log_driver: json-file
+        command: "{{ item.command | default('sleep infinity') }}"
+        privileged: "{{ item.privileged | default(omit) }}"
+        volumes: "{{ item.volumes | default(omit) }}"
+        capabilities: "{{ item.capabilities | default(omit) }}"
+      with_items: "{{ molecule_yml.platforms }}"

molecule/default/destroy.yml

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+---
+- name: Teardown
+  hosts: localhost
+  connection: local
+  gather_facts: False
+  no_log: "{{ not lookup('env', 'MOLECULE_DEBUG') | bool }}"
+  vars:
+    molecule_file: "{{ lookup('env','MOLECULE_FILE') }}"
+    molecule_yml: "{{ lookup('file', molecule_file) | from_yaml }}"
+  tasks:
+    - name: Destroy molecule instance(s)
+      docker_container:
+        name: "{{ item.name }}"
+        state: absent
+        force_kill: "{{ item.force_kill | default(True) }}"
+      with_items: "{{ molecule_yml.platforms }}"

molecule/default/molecule.yml

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+---
+dependency:
+  name: gilt
+
+driver:
+  name: docker
+
+lint:
+  name: yamllint
+
+platforms:
+  - name: container
+    image: debian:stretch
+    privileged: true
+
+provisioner:
+  name: ansible
+  lint:
+    name: ansible-lint
+  connection_options:
+    ansible_ssh_user: 'root'
+    ansible_ssh_common_args: -o ServerAliveInterval=30 -o ControlMaster=auto -o ControlPersist=60s
+
+scenario:
+  name: default
+  test_sequence:
+    - dependency
+    - lint
+    - cleanup
+    - destroy
+    - syntax
+    - create
+    - prepare
+    - converge
+    # no idempotence for the moment
+    # - idempotence
+    - side_effect
+    - verify
+    - cleanup
+    - destroy
+
+verifier:
+  name: testinfra
+  lint:
+    name: flake8

molecule/default/playbook.yml

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+---
+- name: Converge
+  hosts: all
+  gather_facts: True
+  become: true
+  roles:
+    - role: autonomic.discourse.email
+      vars:
+        hostname: forum.example.com
+        root_email_forward: nobody@example.com
+        DISCOURSE_API_KEY: foobar

molecule/default/prepare.yml

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+---
+- name: Prepare
+  hosts: all
+  gather_facts: True
+  become: True
+  roles:
+    - role: geerlingguy.docker
+  tasks:
+    - name: Install python for Ansible
+      raw: test -e /usr/bin/python || (apt -y update && apt install -y python-minimal python-zipstream)
+      become: true
+      changed_when: false
+
+    - name: Install Ansible Python packages
+      apt:
+        package:
+          - python-setuptools
+          - python-pip
+      become: true
+
+    - name: Install python-docker
+      pip:
+        name: docker
+
+    - name: Create dummy Discourse container
+      docker_container:
+        name: app
+        image: alpine
+        state: started
+        privileged: true

molecule/default/requirements.yml

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+---
+- geerlingguy.docker

molecule/default/tests/test_default.yml

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+---
+
+file:
+  /etc/mail-receiver-environment.json:
+    exists: true
+
+package:
+  postfix:
+    installed: true