assert_queries

# File activerecord/lib/active_record/test_case.rb, line 35
    def assert_queries(num = 1, options = {})
      ignore_none = options.fetch(:ignore_none) { num == :any }
      SQLCounter.clear_log
      yield
    ensure
      the_log = ignore_none ? SQLCounter.log_all : SQLCounter.log
      if num == :any
        assert_operator the_log.size, :>=, 1, "1 or more queries expected, but none were executed."
      else
        mesg = "#{the_log.size} instead of #{num} queries were executed.#{the_log.size == 0 ? '' : "\nQueries:\n#{the_log.join("\n")}"}"
        assert_equal num, the_log.size, mesg
      end
    end