starting on 15.2

cookbook/015/02/passingdata/test/performance/browsing_test.rb

@@ -0,0 +1,9 @@
+require 'test_helper'
+require 'rails/performance_test_help'
+
+# Profiling results for each test method are written to tmp/performance.
+class BrowsingTest < ActionDispatch::PerformanceTest
+  def test_homepage
+    get '/'
+  end
+end

cookbook/015/02/passingdata/test/test_helper.rb

@@ -0,0 +1,13 @@
+ENV["RAILS_ENV"] = "test"
+require File.expand_path('../../config/environment', __FILE__)
+require 'rails/test_help'
+
+class ActiveSupport::TestCase
+  # Setup all fixtures in test/fixtures/*.(yml|csv) for all tests in alphabetical order.
+  #
+  # Note: You'll currently still have to declare fixtures explicitly in integration tests
+  # -- they do not yet inherit this setting
+  fixtures :all
+
+  # Add more helper methods to be used by all tests here...
+end