Try to successfully test travis

molecule/default/Dockerfile.j2

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+# Molecule managed
+
+{% if item.registry is defined %}
+FROM {{ item.registry.url }}/{{ item.image }}
+{% else %}
+FROM {{ item.image }}
+{% endif %}
+
+{% if item.env is defined %}
+{% for var, value in item.env.items() %}
+{% if value %}
+ENV {{ var }} {{ value }}
+{% endif %}
+{% endfor %}
+{% endif %}
+
+RUN if [ $(command -v apt-get) ]; then                                                        apt-get update && apt-get install -y python sudo bash ca-certificates iproute2 init && apt-get clean; \
+    elif [ $(command -v zypper) ]; then                                                       zypper refresh && zypper install -y python sudo bash python-xml iproute2 systemd-sysvinit && zypper clean -a; \
+    elif [ $(command -v apk) ]; then                                                          apk update && apk add --no-cache python sudo bash ca-certificates; \
+    elif [ $(command -v xbps-install) ]; then                                                 xbps-install -Syu && xbps-install -y python sudo bash ca-certificates iproute2 && xbps-remove -O; \
+    elif [ $(command -v swupd) ]; then                                                        swupd bundle-add python3-basic sudo iproute2; \
+    elif [ $(command -v dnf) ] && cat /etc/os-release | grep -q '^NAME=Fedora' && \
+           cat /etc/os-release | grep -q '^VERSION_ID=30'; then                               dnf makecache && dnf --assumeyes install python sudo python-devel python3-dnf bash iproute && dnf clean all; \
+    elif [ $(command -v dnf) ] && cat /etc/os-release | grep -q '^NAME=Fedora'; then          dnf makecache && dnf --assumeyes install python sudo python-devel python*-dnf bash iproute && dnf clean all; \
+    elif [ $(command -v dnf) ] && cat /etc/os-release | grep -q '^NAME="CentOS Linux"' ; then dnf makecache && dnf --assumeyes install python36 sudo platform-python-devel python*-dnf bash iproute && dnf clean all && ln -s /usr/bin/python3 /usr/bin/python; \
+    elif [ $(command -v yum) ]; then                                                          yum makecache fast && yum install -y python sudo yum-plugin-ovl bash iproute && sed -i 's/plugins=0/plugins=1/g' /etc/yum.conf && yum clean all; \
+    fi
+
+# Centos:8 + ansible 2.7 failed with error: "The module failed to execute correctly, you probably need to set the interpreter"
+# Solution: ln -s /usr/bin/python3 /usr/bin/python
+
+# Fedora:30 deprecated python2-dnf
+# Solution: explicitly use python3-dnf instead
+# https://github.com/ansible/ansible/issues/54855
+# https://github.com/ansible/ansible/issues/59248

molecule/default/INSTALL.rst

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+*******
+Docker driver installation guide
+*******
+
+Requirements
+============
+
+* Docker Engine
+
+Install
+=======
+
+Please refer to the `Virtual environment`_ documentation for installation best
+practices. If not using a virtual environment, please consider passing the
+widely recommended `'--user' flag`_ when invoking ``pip``.
+
+.. _Virtual environment: https://virtualenv.pypa.io/en/latest/
+.. _'--user' flag: https://packaging.python.org/tutorials/installing-packages/#installing-to-the-user-site
+
+.. code-block:: bash
+
+    $ pip install 'molecule[docker]'

molecule/default/molecule.yml

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+---
+dependency:
+  name: galaxy
+driver:
+  name: docker
+lint:
+  name: yamllint
+platforms:
+  - name: instance-${TOX_ENVNAME}
+    image: ${MOLECULE_DISTRO:-'centos:7'}
+    command: /sbin/init
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    privileged: true
+provisioner:
+  name: ansible
+  lint:
+    name: ansible-lint
+verifier:
+  name: testinfra
+  lint:
+    name: flake8

molecule/default/playbook.yml

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+---
+- name: Converge
+  hosts: all
+  roles:
+    - role: ansible-role-example

molecule/default/tests/test_default.py

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+import os
+
+import testinfra.utils.ansible_runner
+
+testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
+    os.environ['MOLECULE_INVENTORY_FILE']
+).get_hosts('all')
+
+
+def test_hello_world_file(host):
+    f = host.file('/tmp/hello-world.txt')
+    assert f.exists