Try integrate the Travis CI

.travis.yml

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+language: bash
+sudo: true
+services:
+  - docker
+
+before_install:
+  - docker info
+  - docker version
+  - echo "==> Build with Docker ..."
+  - docker build -f tests/Dockerfile.ubuntu16.04  -t chrony:ubuntu16.04 . | tee tests/output.ubuntu16.04.log
+  - docker build -f tests/Dockerfile.centos7      -t chrony:centos7     . | tee tests/output.centos7.log
+
+script:
+  - echo "==> Run Test case ..."
+  - grep 'chronyc (chrony) version' tests/output.ubuntu16.04.log
+  - grep 'chronyc (chrony) version' tests/output.centos7.log
+
+notifications:
+  webhooks: https://galaxy.ansible.com/api/v1/notifications/
+

tests/Dockerfile.centos7

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+# Dockerfile for building image that contains software stack provisioned by Ansible.
+
+FROM williamyeh/ansible:centos7-onbuild
+MAINTAINER Chu-Siang Lai <chusiang.lai@gmail.com>
+
+# run.
+ENV PLAYBOOK provision.yml
+RUN ansible-playbook-wrapper -vvv

tests/Dockerfile.ubuntu16.04

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+# Dockerfile for building image that contains software stack provisioned by Ansible.
+
+FROM williamyeh/ansible:ubuntu16.04-onbuild
+MAINTAINER Chu-Siang Lai <chusiang.lai@gmail.com>
+
+# init.
+#
+# fix policy-rc.d for Docker
+# @see http://www.monblocnotes.com/node/2057
+# @see http://askubuntu.com/a/365912
+RUN sed -i -e 's/exit\s\s*101/exit 0/' /usr/sbin/policy-rc.d
+
+# run.
+ENV PLAYBOOK provision.yml
+RUN ansible-playbook-wrapper -vvv