integration-test-time-assertion.rb

require 'benchmark'

class ActionController::TestCase
  alias __old_process__ process

  def process(*args)
    max_time = 0.2
    time = Benchmark.realtime { __old_process__(*args) }
    assert time < max_time, exceeded_run_time(time, max_time)
  end

  private

  def exceeded_run_time(time, max_time)
    "Request time of #{time} seconds is greater than the max allowed time of #{max_time}"
  end
end