With this module, you can create test e-mail address and you can check if you get a related email. You can use this for Google account.

test_data.rb

require 'net/imap'

class TestData
   def initialize()
      @emailBase   = "username"
      @emailSup    = "gmail.com"
      @password    = "password"
      @emails      = ""
   end

   def create_email(number_of_email=1)

      # read the text file as a list of lines
      # find the last line, and insert new line
      data = open('numberRun.txt', "r")
      lineList = data.readlines()
      data.close()

      now = Time.new

      #first time running, empty list
      if lineList.length == 0
         lastLineList = '0' + ',' + @emailBase + ',' + now.strftime("%Y-%m-%d_%H:%M") + ',' + 'False'
      else
         lastLineList = lineList[lineList.length - 1]
      end

      list = lastLineList.split(',')
      lastUsedNumber  = list[0].gsub("[", "").to_i
      lastUsedEmail   = list[1].to_s
      date            = list[2].to_s
      isRegistered    = list[3].gsub("]", "").to_s

      data = open('./numberRun.txt', "a")

      for i in 1..number_of_email
         newEmail        = @emailBase + '+' + (lastUsedNumber + i).to_s + '@' + @emailSup
         @emails << newEmail << ", "
         newEmailFull    = lastUsedNumber + i, newEmail, now.strftime("%Y-%m-%d_%H:%M"), "YES"
         data.write(newEmailFull)
         data.write("\n")
      end

      data.close()

      @emails = @emails[0..-3]
      puts @emails
      return @emails
   end

   def get_email()
      imap = Net::IMAP.new('imap.gmail.com',993,true)
      imap.login((@emailBase + '@' + @emailSup), @password)
      imap.select('INBOX')
      mailIds = imap.search([1])
      mailIds.each do |id|
         msg = imap.fetch(id,'RFC822')[0].attr['RFC822']
         return msg
      end
      imap.logout()
      imap.disconnect()
   end

   def check_email_content(search_content)
      content = get_email()
      result = false

      if content.length == 0
         puts "There is no e-mail"
         result = false
      elsif content.include?(search_content)
         puts "e-mail has content: #{search_content}"
         result = true
      else
         puts "e-mail has no content: #{search_content}"
         result = false
      end

      return result
   end
end