Sunspot/RSpec configuration (borrows heavily from https://dzone.com/articles/install-and-test-solrsunspot)

sunspot.rb

require 'sunspot/rails/spec_helper'
require 'net/http'

try_server = proc do |uri|
  begin
    response = Net::HTTP.get_response uri
    response.code != "503"
  rescue Errno::ECONNREFUSED
  end
end

start_server = proc do |timeout|
  server = Sunspot::Rails::Server.new
  uri = URI.parse("http://0.0.0.0:#{server.port}/solr/default/update?wt=json")

  try_server[uri] or begin
    server.start
    at_exit { server.stop }

    timeout.times.any? do
      sleep 1
      try_server[uri]
    end
  end
end

original_session = nil # always nil between specs
sunspot_server = nil   # one server shared by all specs

if defined? Spork
  Spork.prefork do
    sunspot_server = start_server[60] if Spork.using_spork?
  end
end

RSpec.configure do |config|
  config.before(:each) do |example|
    if example.metadata[:solr]
      sunspot_server ||= start_server[60] || raise("SOLR connection timeout")
    else
      original_session = Sunspot.session
      Sunspot.session = Sunspot::Rails::StubSessionProxy.new(original_session)
    end
  end

  config.after(:each) do |example|
    if example.metadata[:solr]
      Sunspot.remove_all!
    else
      Sunspot.session = original_session
    end

    original_session = nil
  end
end