def assert_perform_ips(iterations, options = {}, &work)
      mean, stddev, _ = Iteration.run(options, &work)
      iterations <= (mean + 3 * stddev)
    end
def assert_perform_ips(iterations, options = {}, &work)
      mean, stddev, _ = Iteration.run(options, &work)
      iterations <= (mean + 3 * stddev)
    end
Assert work is performed within expected iterations per second

 @param [Integer] iterations

 @return [Boolean]

 @api public