def assert_perform_under(threshold, options = {}, &work)
      actual, _ = ExecutionTime.run(options, &work)
      actual <= threshold
    end
def assert_perform_under(threshold, options = {}, &work)
      actual, _ = ExecutionTime.run(options, &work)
      actual <= threshold
    end
Run given work and gather time statistics

 @param [Float] threshold

 @return [Boolean]

 @api public