Add test for upgrading from previous version of oss to current

test/integration/helpers/serverspec/oss_upgrade_spec.rb

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+require 'spec_helper'
+
+shared_examples 'oss_upgrade::init' do |vars|
+  describe 'version check' do
+    it 'should be reported as version '+vars['es_version'] do
+      expect(curl_json('http://localhost:9200')['version']['number']).to eq(vars['es_version'])
+    end
+  end
+end

test/integration/oss-upgrade.yml

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+---
+- name: Standard test for single node setup. Tests idempotence.
+  hosts: localhost
+  tasks:
+    - include: elasticsearch/test/integration/debug.yml
+  roles:
+    - { role: elasticsearch, es_instance_name: "node1" }
+  vars:
+    es_version: "{{ '6.2.4' if es_major_version == '6.x' else '5.6.9' }}" # This is set to an older version than the current default to force an upgrade
+    es_enable_xpack: false
+    es_heap_size: "1g"
+
+- name: Standard test for single node setup. Tests idempotence.
+  hosts: localhost
+  tasks:
+    - include: elasticsearch/test/integration/debug.yml
+  roles:
+    - { role: elasticsearch, es_instance_name: "node1" }
+  vars:
+    es_enable_xpack: false
+    es_heap_size: "1g"

test/integration/oss-upgrade/oss-upgrade.yml

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+---
+- host: test-kitchen

test/integration/oss-upgrade/serverspec/default_spec.rb

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+require 'oss_upgrade_spec'
+require 'json'
+vars = JSON.parse(File.read('/tmp/vars.json'))
+
+describe 'oss upgrade Tests' do
+  include_examples 'oss_upgrade::init', vars
+end