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module Dataset
  module Database # :nodoc:
    
    # Provides Dataset a way to clear, dump and load databases.
    class Base
      include FileUtils
      
      def clear
        connection = ActiveRecord::Base.connection
        ActiveRecord::Base.silence do
          connection.tables.each do |table_name|
            unless %w{table_to_keep another_table even_another_table}.include? (table_name)
              puts "Emptying #{table_name}"
              connection.delete "DELETE FROM #{connection.quote_table_name(table_name)}",
                "Dataset::Database#clear" unless table_name == ActiveRecord::Migrator.schema_migrations_table_name
            else
              puts "Skipping #{table_name}"
            end
          end
        end
      end
    end
  end
end

The goal is to see a marked improvement in overall test run speed, basing this on the assumption that it is faster to have the OS
copy a file or mySQL dump and load. Of course, we may find this to be a false assumption, but there were plenty of bugs in the    
former 'Scenarios' - addressing that afforded the opportunity to test the assumption.