ci(travis): add Inspec tests

test/integration/default/README.md

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+# InSpec Profile: `default`
+
+This shows the implementation of the `default` InSpec [profile](https://github.com/inspec/inspec/blob/master/docs/profiles.md).
+
+## Verify a profile
+
+InSpec ships with built-in features to verify a profile structure.
+
+```bash
+$ inspec check default
+Summary
+-------
+Location: default
+Profile: profile
+Controls: 4
+Timestamp: 2019-06-24T23:09:01+00:00
+Valid: true
+
+Errors
+------
+
+Warnings
+--------
+```
+
+## Execute a profile
+
+To run all **supported** controls on a local machine use `inspec exec /path/to/profile`.
+
+```bash
+$ inspec exec default
+..
+
+Finished in 0.0025 seconds (files took 0.12449 seconds to load)
+8 examples, 0 failures
+```
+
+## Execute a specific control from a profile
+
+To run one control from the profile use `inspec exec /path/to/profile --controls name`.
+
+```bash
+$ inspec exec default --controls package
+.
+
+Finished in 0.0025 seconds (files took 0.12449 seconds to load)
+1 examples, 0 failures
+```
+
+See an [example control here](https://github.com/inspec/inspec/blob/master/examples/profile/controls/example.rb).

test/integration/default/controls/config_spec.rb

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+control 'Timezone configuration' do
+  title 'should match desired lines'
+
+  def test_file_content(config_file)
+    describe file(config_file) do
+      its('content') { should include 'Europe/Paris' }
+    end
+  end
+
+  def test_symlink(config_file)
+    describe file(config_file) do
+      its('link_path') { should eq '/usr/share/zoneinfo/Europe/Paris' }
+    end
+  end
+
+  case os[:family]
+  when 'debian'
+    test_file_content('/etc/timezone')
+  else
+    test_symlink('/etc/localtime')
+  end
+end

test/integration/default/controls/package_spec.rb

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+control 'Timezone package' do
+  title 'should be installed'
+
+  package_name =
+    case os[:family]
+    when 'suse'
+      'timezone'
+    else
+      'tzdata'
+    end
+
+  describe package(package_name) do
+    it { should be_installed }
+  end
+end

test/integration/default/inspec.yml

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+---
+name: default
+title: timezone formula
+maintainer: SaltStack Formulas
+license: Apache-2.0
+summary: Verify that the timezone formula is setup and configured correctly
+supports:
+  - platform-name: debian
+  - platform-name: ubuntu
+  - platform-name: centos
+  - platform-name: fedora
+  - platform-name: opensuse
+  - platform-name: suse
+  - platform-name: freebsd
+  - platform-name: amazon

test/salt/pillar/timezone.sls

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+---
+timezone:
+  name: 'Europe/Paris'
+  utc: true