Basic testing framework

.kitchen.yml

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+---
+driver:
+  name: docker
+
+driver_config:
+  use_sudo: false
+  privileged: true
+  provision_command: mkdir -p /run/sshd
+  run_command: /sbin/init
+
+platforms:
+  - name: debian-9
+  - name: ubuntu-17.10
+  - name: centos-7
+    driver_config:
+      image: saltstack/centos-7-minimal
+
+provisioner:
+  name: salt_solo
+  log_level: info
+  require_chef: false
+  salt_version: latest
+  formula: postfix
+  salt_copy_filter:
+    - .kitchen
+    - .git
+  pillars:
+    top.sls:
+      base:
+        '*':
+          - postfix
+    postfix.sls:
+      postfix:
+         manage_master_config: False
+
+verifier:
+  name: inspec
+  sudo: false
+  # cli, documentation, html, progress, json, json-min, json-rspec, junit
+  reporter: cli
+  inspec_tests:
+    - path: test/integration/default
+
+suites:
+  - name: postfix
+    provisioner:
+      state_top:
+        base:
+          '*':
+            - postfix
+            - postfix.config

.travis.yml

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+sudo: required
+cache: bundler
+language: ruby
+
+services:
+  - docker
+
+before_install:
+  - bundle install
+
+script: bundle exec kitchen verify

test/integration/default/pkgs_spec.rb

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+control 'Postfix packages' do
+  title 'should be installed'
+
+  describe package('postfix') do
+    it { should be_installed }
+  end
+end

test/integration/default/service_spec.rb

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+control 'Postfix service' do
+  title 'should be running'
+
+  describe service('postfix') do
+    it { should be_enabled }
+    it { should be_running }
+  end
+
+  describe port(25) do
+    it { should be_listening }
+  end
+end