error.log

--> Validating schema /home/tonk/molecule/moletest/molecule/default/molecule.yml.
Validation completed successfully.
--> Test matrix
    
└── default
    └── verify
    
--> Scenario: 'default'
--> Action: 'verify'
--> Executing Testinfra tests found in /home/tonk/molecule/moletest/molecule/default/tests/...
    ============================= test session starts ==============================
    platform linux2 -- Python 2.7.14, pytest-3.3.2, py-1.5.2, pluggy-0.6.0 -- /usr/bin/python2
    rootdir: /home/tonk/molecule/moletest/molecule/default, inifile:
    plugins: testinfra-1.7.1
    ^Mcollecting 0 items                                                             ^Mcollecting 0 items / 1 errors                                                  ^Mcollected 0 items / 1 errors                                                   
    
    ==================================== ERRORS ====================================
    ___________________ ERROR collecting tests/test_packages.py ____________________
    /usr/lib/python2.7/site-packages/pluggy/__init__.py:617: in __call__
        return self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
    /usr/lib/python2.7/site-packages/pluggy/__init__.py:222: in _hookexec
        return self._inner_hookexec(hook, methods, kwargs)
    /usr/lib/python2.7/site-packages/pluggy/__init__.py:216: in <lambda>
        firstresult=hook.spec_opts.get('firstresult'),
    /usr/lib/python2.7/site-packages/_pytest/python.py:192: in pytest_pycollect_makeitem
        res = list(collector._genfunctions(name, obj))
    /usr/lib/python2.7/site-packages/_pytest/python.py:370: in _genfunctions
        self.ihook.pytest_generate_tests(metafunc=metafunc)
    /usr/lib/python2.7/site-packages/pluggy/__init__.py:617: in __call__
        return self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
    /usr/lib/python2.7/site-packages/pluggy/__init__.py:222: in _hookexec
        return self._inner_hookexec(hook, methods, kwargs)
    /usr/lib/python2.7/site-packages/pluggy/__init__.py:216: in <lambda>
        firstresult=hook.spec_opts.get('firstresult'),
    /usr/lib/python2.7/site-packages/testinfra/plugin.py:143: in pytest_generate_tests
        ansible_inventory=metafunc.config.option.ansible_inventory,
    /usr/lib/python2.7/site-packages/testinfra/host.py:125: in get_hosts
        for backend in testinfra.backend.get_backends(hosts, **kwargs):
    /usr/lib/python2.7/site-packages/testinfra/backend/__init__.py:89: in get_backends
        for name in klass.get_hosts(host, **kw):
    /usr/lib/python2.7/site-packages/testinfra/backend/ansible.py:72: in get_hosts
        return AnsibleRunner(kwargs.get("ansible_inventory")).get_hosts(host)
    /usr/lib/python2.7/site-packages/testinfra/utils/ansible_runner.py:171: in __init__
        self.cli._play_prereqs(self.cli.options))
    /usr/lib/python2.7/site-packages/ansible/cli/__init__.py:804: in _play_prereqs
        inventory = InventoryManager(loader=loader, sources=options.inventory)
    /usr/lib/python2.7/site-packages/ansible/inventory/manager.py:145: in __init__
        self.parse_sources(cache=True)
    /usr/lib/python2.7/site-packages/ansible/inventory/manager.py:206: in parse_sources
        parse = self.parse_source(source, cache=cache)
    /usr/lib/python2.7/site-packages/ansible/inventory/manager.py:261: in parse_source
        if plugin.verify_file(source):
    /usr/lib/python2.7/site-packages/ansible/plugins/inventory/yaml.py:84: in verify_file
        if not ext or ext in self.get_option('yaml_extensions'):
    /usr/lib/python2.7/site-packages/ansible/plugins/__init__.py:58: in get_option
        option_value = C.config.get_config_value(option, plugin_type=get_plugin_class(self), plugin_name=self._load_name, variables=hostvars)
    /usr/lib/python2.7/site-packages/ansible/config/manager.py:284: in get_config_value
        value, _drop = self.get_config_value_and_origin(config, cfile=cfile, plugin_type=plugin_type, plugin_name=plugin_name, keys=keys, variables=variables)
    /usr/lib/python2.7/site-packages/ansible/config/manager.py:304: in get_config_value_and_origin
        defs = self._plugins[plugin_type][plugin_name]
    E   KeyError: 'inventory'
    !!!!!!!!!!!!!!!!!!! Interrupted: 1 errors during collection !!!!!!!!!!!!!!!!!!!!
    =========================== 1 error in 1.85 seconds ============================

molecule.yml

---
# Set dependency manager
dependency:
  name: galaxy
  options:
    ignore-certs: True
    ignore-errors: True
#
# Use Docker
#
driver:
  name: docker
#
# Use Linter
#
lint:
  name: yamllint
  options:
    config-file: molecule/default/yamllint.cfg
#
# Ansible provisioner and variables
#
provisioner:
  name: ansible
  inventory:
    group_vars:
      all:
        name: Wile E. Coyote
        company: ACME
        domain: acme.net
  lint:
    name: ansible-lint
#
# Which tests
#
scenario:
  name: default
verifier:
  name: testinfra
  options:
    verbose: True    name: flake8
#
# Which platforms
#
platforms:
  #
  - name: centos7
    hostname: centos7
    image: couchbase/centos7-systemd
    image_version: latest
    privileged: True
    groups:
      - chrony
      - centos
    command: "/usr/sbin/init"
    volumes:
      - "/sys/fs/cgroup:/sys/fs/cgroup:rw"

    debug: False
  lint:

test_packages.py

"""Test infra sctructure."""
import testinfra.utils.ansible_runner as ti

# Get all hosts from the Ansible inventory
# The inventory is generated from the molecule.yml file
inventory = '/tmp/molecule/chrony/default/ansible_inventory.yml'
hosts = ti.AnsibleRunner(inventory).get_hosts('all')

def test_packages(host):
    """Test if all packages are present."""
    present = [
        host.package('chrony'),
        host.package('ca-certificates'),
        host.package('libselinux-python')
    ]

    if present:
        for this in present:
            assert this.is_installed