Aws.config[:rds] = { stub_responses: { describe_db_parameters: { parameters: [ { parameter_name: 'basedir', parameter_value: '/rdsdbbin/mysql' }, { parameter_name: 'innodb_buffer_pool_size', parameter_value: '{DBInstanceClassMemory*3/4}' }, { parameter_name: 'max_allowed_packet', parameter_value: '16777216' } ] } } }