Spits out a report at the end of your tests on how many times each model was created

report_model_creation_counts.rb

if Rails.application.config.report_model_creation_counts

  class ReportModelCreationCounts < ActiveRecord::Observer

    @@creates = Hash.new { |hash, key| hash[key] = 0 }

    def after_create(record)
      @@creates[record.class] += 1
    end

    def self.print_report
      puts 'Your tests created the following objects:'
      longest_key = @@creates.keys.max { |a, b| a.to_s.length <=> b.to_s.length }.to_s
      report = @@creates.sort { |a,b| b[1] <=> a[1] } # sort in descending order
      report.each do |klass, creations|
        printf "%-#{longest_key.length}s %s\n", klass, creations if creations > 0
      end
    end

    def self.all_models
      models = ActiveRecord::Base.send(:descendants)
      @@required ||= false
      unless @@required
        Dir.glob(Rails.root.to_s + '/app/models/**/*.rb').each do |file|
          begin
            klass = File.basename(file.gsub('/app/models/', '').gsub('/', '_'), '.rb').classify.constantize
          rescue
            require file
          end
        end
      end
      @@required = true
      models = ActiveRecord::Base.send(:descendants).map(&:to_s).sort.map(&:constantize)
      models.each do |model|
        @@creates[model] = 0
      end
    end

    observe all_models

  end

  ReportModelCreationCounts.instance

  RSpec.configure do |config|

    config.after(:suite) do
      ReportModelCreationCounts.print_report
    end

  end

end

Put it in your spec/support directory to get it working.