charger

#https://en.wikipedia.org/wiki/Luhn_algorithm
# v1
def self.check_digit_for(number)
  digits = number.to_s.reverse.split(//)

  sum = 0
  digits.each_with_index do |digit, index|
    digit = digit.to_i
    digit *= 2 if index.even?
    digit -= 9 if digit > 9

charger

#/spec/support/the_service.rb

#ensure that after all specs TheService will be stopped
RSpec.configure do |config|
  config.after :suite do
    TheServiceControl.stop
  end
end

class TheServiceControl

charger

#/spec/support/the_service.rb

class TheServiceControl
#....
    def start
      return unless @pid.nil?
      puts "TheService starting. "
      env = config['rails']['env']
      cmd = "go run #{config['rails']['main_go']} --config.file=#{config_path}"
      puts cmd #useful for debug when need run project manually

charger

#/spec/support/the_service_config.yml

server:
  addr: 127.0.0.1:8082
db:
  dsn: dbname=project_test sslmode=disable user=postgres password=secret
redis:
  url: redis://127.0.0.1:6379/1

rails:

charger

#/spec/support/the_service.rb

class TheServiceControl
#....
    def stop
      return if @pid.nil?
      print "Stopping TheService (PID: #{@pid}). "
      Process.kill("KILL", -Process.getpgid(@pid))
      res = Process.wait
      @pid = nil

charger

#spec/support/shared_contexts/the_service_black_box.rb

shared_context 'the_service_black_box' do
  let(:params) do
    {
      type: 'save',
      data: 1
    }
  end

charger

#spec/requests/the_service/ping_spec.rb

require 'spec_helper'

describe 'ping request' do
  include_context 'the_service_black_box'

  it 'returns response back' do
    params[:type] = 'ping'