make testing fast by stubbing out any call to elasticsearch cluster unless spec is tagged

spec_elasticsearch_helper.rb

# ruby 2.20
#
# gems
#   rspec-3.2.0
#   webmock-1.18.0
#   elasticsearch-extensions-0.0.15
#   elasticsearch-persistence-0.1.4

# Rake needs to be loaded for elasticsearch cluster
require 'rake'

# add some helper methods from lib/issue_data
load 'tasks/helper_methods.rake'

require 'elasticsearch/extensions/test/cluster/tasks'
require 'elasticsearch/persistence/model'

RSpec.configure do |config|
  es_test_cluster = Elasticsearch::Extensions::Test::Cluster
  es_test_cluster_running = false

  config.before :context, elasticsearch: true do |context|
    @elasticsearch_context = true
  end

  config.before :example do |example|
    if @elasticsearch_context || example.metadata[:elasticsearch]
      WebMock::Config.instance.allow_localhost = true

      unless es_test_cluster.running?
        es_test_cluster.start(nodes: 1)
        es_test_cluster_running = true
      end

      purge_index Log, Item
    else
      stub_request(:any, /localhost:9250/).to_return(body: {hits: {total: 0}})
    end
  end

  config.before :suite do
    options = {host: 'localhost:9250'}
    #options[:log] = true
    Elasticsearch::Persistence.client = Elasticsearch::Client.new(options)
  end
  
  config.after :suite do
    es_test_cluster.stop if es_test_cluster_running
  end
end