Error while executing molecule verify: RuntimeError: One or more hosts is required with the docker backend

[dj-wasabi]

When doing an molecule verify with TestInfra:

 (molecule_test) $ molecule verify
WARNING:vagrant:The Vagrant executable cannot be found. Please check if it is in the system path.
--> Executing testinfra tests found in tests/.
============================= test session starts ==============================
platform linux2 -- Python 2.7.5, pytest-3.0.0, py-1.4.31, pluggy-0.3.1
rootdir: /git/ansible/ansible-zabbix-proxy, inifile:
plugins: cov-2.3.1, xdist-1.14, testinfra-1.4.1
collected 0 items / 1 errorss

==================================== ERRORS ====================================
____________________ ERROR collecting tests/test_default.py ____________________
/usr/lib/python2.7/site-packages/testinfra/plugin.py:124: in pytest_generate_tests
    ansible_inventory=metafunc.config.option.ansible_inventory,
/usr/lib/python2.7/site-packages/testinfra/__init__.py:35: in get_backends
    _BACKENDS_CACHE[key] = backend.get_backends(hosts, **kwargs)
/usr/lib/python2.7/site-packages/testinfra/backend/__init__.py:87: in get_backends
    for name in klass.get_hosts(host, **kw):
/usr/lib/python2.7/site-packages/testinfra/backend/base.py:126: in get_hosts
    cls.get_connection_type(),),
E   RuntimeError: One or more hosts is required with the docker backend
============================ pytest-warning summary ============================
WP1 None Modules are already imported so can not be re-written: testinfra
!!!!!!!!!!!!!!!!!!! Interrupted: 1 errors during collection !!!!!!!!!!!!!!!!!!!!
================== 1 pytest-warnings, 1 error in 0.27 seconds ==================
ERROR: 

  RAN: '/usr/bin/testinfra tests/test_default.py --connection=docker'

  STDOUT:


  STDERR:

Molecule: 1.9.0
Ansible: 2.1.1.0
TestInfra: 1.4.1

Running testinfra manually does work.

[retr0h]

For those which run molecule init under 1.9 the test files will be created properly. Unfortunately, your tests were created with an older version of testinfra. I didn't think of the repercussions appropriately with this change.

Updating your tests with this, will fix your problem.

[retr0h]

Closing since this is resolved.

[mrmuli]

now here
also don't forget to update your MOLECULE_INVENTORY_FILE env var