Sample test file

gistfile1.rb

require 'abstract_unit'
require 'benchmark'
require 'benchmark/ips'
require 'ruby-prof'

class AController < ActionController::Base
  def index
    render html: 'ok'
  end
end

class AControllerTest < ActionController::TestCase
  def test_profile
    get :index
    assert_equal 'ok', response.body
  end
end

class AController1Test < ActionDispatch::IntegrationTest
  def test_profile
    get 'https://www.example.com/a/index'
    assert_equal 'ok', response.body
  end
end

Benchmark.bm(30) do |bm|
  bm.report 'Slow' do
    RubyProf.start
    400.times do
    Minitest.run_one_method(AController1Test, 'test_profile')
    end
    results = RubyProf.stop
    File.open "a.html", 'w' do |file|
      RubyProf::GraphHtmlPrinter.new(results).print(file)
    end
  end

  bm.report 'Fast' do
    Minitest.run_one_method(AController1Test, 'test_profile')
  end
end