Add molecule jobs to test the modules

Change-Id: I0b252e2fc7d34f54f739199bdce450b1bef8d20b

ansible.cfg

@@ -0,0 +1,4 @@
+# Used for testing to avoid using one from outside repository
+[defaults]
+# Avoid noise which can make debugging test failures harder
+deprecation_warnings=False

molecule/default/converge.yml

@@ -0,0 +1,14 @@
+---
+- name: Converge
+  hosts: all
+  tasks:
+
+    - name: "Test yum_config repo"
+      tripleo.repos.yum_config:
+        type: repo
+        name: appstream
+        enabled: true
+      tags:
+        # TODO: fix yum_config to correctly report changed state and uncomment
+        # the line below which disables molecule idemptotence test.
+        - molecule-idempotence-notest

molecule/default/molecule.yml

@@ -0,0 +1,12 @@
+---
+dependency:
+  name: galaxy
+driver:
+  name: docker
+platforms:
+  - name: instance
+    image: quay.io/centos/centos:stream8
+provisioner:
+  name: ansible
+verifier:
+  name: ansible

molecule/default/verify.yml

@@ -0,0 +1,10 @@
+---
+# This is an example playbook to execute Ansible tests.
+
+- name: Verify
+  hosts: all
+  gather_facts: false
+  tasks:
+  - name: Example assertion
+    assert:
+      that: true

tox.ini

@@ -7,7 +7,9 @@ requires =
 
 [testenv]
 usedevelop = True
-setenv = VIRTUAL_ENV={envdir}
+setenv =
+  ANSIBLE_FORCE_COLOR={tty:1:0}
+  VIRTUAL_ENV={envdir}
 passenv =
   HOME
 deps =
@@ -81,6 +83,19 @@ commands =
 whitelist_externals =
   sh
 
+[testenv:molecule]
+description = Used by all molecule jobs (tox-ansible)
+deps =
+  ansible-core
+  molecule>=3.3.0,<3.4.0  # bug with collection install
+  molecule-docker
+usedevelop = False
+skip_install = true
+commands =
+  ansible-galaxy collection install -v 'community.docker:>=1.8.0'
+  ansible-galaxy collection install -v --force .
+  molecule test
+
 [flake8]
 ignore = H803
 show-source = True

zuul.d/layout.yaml

@@ -21,6 +21,7 @@
             vars:
               tox_envlist: pep8,packaging
         - openstack-tox-py39
+        - tripleo-tox-molecule
         - tripleo-buildimage-overcloud-full-centos-8:
             dependencies: &deps_unit_lint_cprovider
               - openstack-tox-pep8