diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index d9574a8..533d1f3 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -7,6 +7,10 @@ jobs:
     runs-on: ubuntu-latest
     name: Example Rails app
     steps:
+    - name: Install libvips
+      run: |
+        sudo apt-get update
+        sudo apt-get install --no-install-recommends libvips
     - uses: actions/checkout@v3
     - uses: ruby/setup-ruby@v1
       with:
@@ -29,7 +33,6 @@ jobs:
           - '7.2'
           - '8.0'
         ruby:
-          - '2.7'
           - '3.0'
           - '3.1'
           - '3.2'
@@ -41,14 +44,10 @@ jobs:
             ruby: '3.1'
           - rails: '8.0'
             ruby: '3.0'
-          - rails: '8.0'
-            ruby: '2.7'
 
           # Rails 7.2 requires Ruby 3.1.
           - rails: '7.2'
             ruby: '3.0'
-          - rails: '7.2'
-            ruby: '2.7'
 
           # Rails 7.0 doesn't work out of the box with Ruby 3.4.
           - rails: '7.0'
@@ -57,6 +56,10 @@ jobs:
       BUNDLE_GEMFILE: gemfiles/rails_${{ matrix.rails }}.gemfile
     name: RSpec (Ruby ${{ matrix.ruby }} / Rails ${{ matrix.rails }})
     steps:
+    - name: Install libvips
+      run: |
+        sudo apt-get update
+        sudo apt-get install --no-install-recommends libvips
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
diff --git a/Appraisals b/Appraisals
index 8db81f2..4f5a968 100644
--- a/Appraisals
+++ b/Appraisals
@@ -3,6 +3,7 @@
 appraise 'rails_7.0' do
   gem 'concurrent-ruby', '< 1.3.5'
   gem 'rails', '~> 7.0.0'
+  gem 'sqlite3', '<2'
 end
 
 appraise 'rails_7.1' do
diff --git a/Gemfile b/Gemfile
index cb1c5a1..3403baf 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,5 +6,18 @@ gemspec
 
 gem 'appraisal'
 gem 'rake'
-gem 'rspec'
 gem 'rubocop'
+
+# For the example app tests.
+gem 'image_processing'
+gem 'sprockets-rails'
+gem 'sqlite3'
+
+group :development, :test do
+  gem 'rspec-rails'
+end
+
+group :test do
+  gem 'capybara'
+  gem 'factory_bot_rails'
+end
diff --git a/example-app/.gitignore b/example-app/.gitignore
index 7321a84..8245144 100644
--- a/example-app/.gitignore
+++ b/example-app/.gitignore
@@ -15,6 +15,8 @@
 /log/*
 /tmp/*
 
+# Ignore storage (uploaded files in development and any SQLite databases).
+/storage/*
 
 /public/assets
 .byebug_history
diff --git a/example-app/Gemfile b/example-app/Gemfile
index a1a2542..4b69492 100644
--- a/example-app/Gemfile
+++ b/example-app/Gemfile
@@ -1,9 +1,10 @@
 source 'https://rubygems.org'
 
-gem 'rails', '~> 8.0.1'
+gem 'parklife-rails', path: '../'
+
+gem 'image_processing'
 gem 'sprockets-rails'
 gem 'sqlite3'
-gem 'parklife-rails', path: '../'
 
 group :development do
   gem 'webrick'
diff --git a/example-app/Parkfile b/example-app/Parkfile
index e657224..4a80ebc 100644
--- a/example-app/Parkfile
+++ b/example-app/Parkfile
@@ -1,4 +1,3 @@
-require 'parklife-rails'
 require_relative 'config/environment'
 
 Parklife.application.configure do |config|
@@ -17,4 +16,9 @@ Parklife.application.routes do
 
   # Services typically allow a custom 404 page.
   # get '/404.html'
+
+  if ENV['RAILS_ENV'] == 'test'
+    get test_middleware_path
+    get test_url_path
+  end
 end
diff --git a/example-app/app/controllers/test_controller.rb b/example-app/app/controllers/test_controller.rb
new file mode 100644
index 0000000..6124555
--- /dev/null
+++ b/example-app/app/controllers/test_controller.rb
@@ -0,0 +1,11 @@
+class TestController < ApplicationController
+  layout false
+
+  def middleware
+    render plain: Rails.application.config.middleware.map(&:name).join("\n")
+  end
+
+  def url
+    render plain: test_url_url
+  end
+end
diff --git a/example-app/app/models/post.rb b/example-app/app/models/post.rb
index 27a6795..b706315 100644
--- a/example-app/app/models/post.rb
+++ b/example-app/app/models/post.rb
@@ -1,4 +1,6 @@
 class Post < ApplicationRecord
+  has_one_attached :hero
+
   def to_param
     slug
   end
diff --git a/example-app/app/views/posts/show.html.erb b/example-app/app/views/posts/show.html.erb
index 826e7b9..cfee805 100644
--- a/example-app/app/views/posts/show.html.erb
+++ b/example-app/app/views/posts/show.html.erb
@@ -1,3 +1,11 @@
+<% if @post.hero.attached? %>
+  <div>
+    <%= image_tag(
+      @post.hero.variant(resize_to_limit: [100, 100]).processed.url
+    ) %>
+  </div>
+<% end %>
+
 <h1><%= @post.title %></h1>
 
 <%= simple_format @post.body %>
diff --git a/example-app/config/application.rb b/example-app/config/application.rb
index 3384f33..3d64430 100644
--- a/example-app/config/application.rb
+++ b/example-app/config/application.rb
@@ -5,7 +5,7 @@
 require "active_model/railtie"
 require "active_job/railtie"
 require "active_record/railtie"
-# require "active_storage/engine"
+require "active_storage/engine"
 require "action_controller/railtie"
 # require "action_mailer/railtie"
 # require "action_mailbox/engine"
@@ -18,15 +18,19 @@
 # you've limited to :test, :development, or :production.
 Bundler.require(*Rails.groups)
 
+require 'parklife-rails/activestorage'
+
 module Example
   class Application < Rails::Application
     # Initialize configuration defaults for originally generated Rails version.
-    config.load_defaults 8.0
+    config.load_defaults Rails::VERSION::STRING.to_f
 
-    # Please, add to the `ignore` list any other `lib` subdirectories that do
-    # not contain `.rb` files, or that should not be reloaded or eager loaded.
-    # Common ones are `templates`, `generators`, or `middleware`, for example.
-    config.autoload_lib(ignore: %w[assets tasks])
+    if config.respond_to?(:autoload_lib)
+      # Please, add to the `ignore` list any other `lib` subdirectories that do
+      # not contain `.rb` files, or that should not be reloaded or eager loaded.
+      # Common ones are `templates`, `generators`, or `middleware`, for example.
+      config.autoload_lib(ignore: %w[assets tasks])
+    end
 
     # Configuration for the application, engines, and railties goes here.
     #
diff --git a/example-app/config/environments/development.rb b/example-app/config/environments/development.rb
index 0165c73..bdbe732 100644
--- a/example-app/config/environments/development.rb
+++ b/example-app/config/environments/development.rb
@@ -28,6 +28,9 @@
   # Change to :null_store to avoid any caching.
   config.cache_store = :memory_store
 
+  # Store uploaded files on the local file system (see config/storage.yml for options).
+  config.active_storage.service = :local
+
   # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log
 
@@ -48,7 +51,4 @@
 
   # Annotate rendered view with file names.
   config.action_view.annotate_rendered_view_with_filenames = true
-
-  # Raise error when a before_action's only/except options reference missing actions.
-  config.action_controller.raise_on_missing_callback_actions = true
 end
diff --git a/example-app/config/environments/production.rb b/example-app/config/environments/production.rb
index c6e93c6..ff425d5 100644
--- a/example-app/config/environments/production.rb
+++ b/example-app/config/environments/production.rb
@@ -21,6 +21,9 @@
   # Enable serving of images, stylesheets, and JavaScripts from an asset server.
   # config.asset_host = "http://assets.example.com"
 
+  # Store uploaded files on the local file system (see config/storage.yml for options).
+  config.active_storage.service = :local
+
   # Assume all access to the app is happening through a SSL-terminating reverse proxy.
   config.assume_ssl = true
 
diff --git a/example-app/config/environments/test.rb b/example-app/config/environments/test.rb
index 14bc29e..efdc7f7 100644
--- a/example-app/config/environments/test.rb
+++ b/example-app/config/environments/test.rb
@@ -28,6 +28,9 @@
   # Disable request forgery protection in test environment.
   config.action_controller.allow_forgery_protection = false
 
+  # Store uploaded files on the local file system in a temporary directory.
+  config.active_storage.service = :test
+
   # Print deprecation notices to the stderr.
   config.active_support.deprecation = :stderr
 
@@ -36,7 +39,4 @@
 
   # Annotate rendered view with file names.
   # config.action_view.annotate_rendered_view_with_filenames = true
-
-  # Raise error when a before_action's only/except options reference missing actions.
-  config.action_controller.raise_on_missing_callback_actions = true
 end
diff --git a/example-app/config/initializers/parklife_test.rb b/example-app/config/initializers/parklife_test.rb
new file mode 100644
index 0000000..0884c4c
--- /dev/null
+++ b/example-app/config/initializers/parklife_test.rb
@@ -0,0 +1,11 @@
+case ENV['PARKLIFE_SET_RAILS_URL']
+when 'force_ssl'
+  Rails.application.config.force_ssl = true
+when 'yes'
+  ActionController::Base.relative_url_root = '/foo'
+
+  Rails.application.routes.default_url_options.merge!(
+    host: 'rails.example.org',
+    protocol: 'https',
+  )
+end
diff --git a/example-app/config/routes.rb b/example-app/config/routes.rb
index 7684cd1..0dbba7c 100644
--- a/example-app/config/routes.rb
+++ b/example-app/config/routes.rb
@@ -2,4 +2,7 @@
   root to: 'posts#index'
 
   resources :posts
+
+  get 'test/middleware', to: 'test#middleware'
+  get 'test/url', to: 'test#url'
 end
diff --git a/example-app/config/storage.yml b/example-app/config/storage.yml
new file mode 100644
index 0000000..f713bf3
--- /dev/null
+++ b/example-app/config/storage.yml
@@ -0,0 +1,34 @@
+test:
+  service: Parklife
+  root: <%= Rails.root.join("tmp/storage") %>
+
+local:
+  service: Parklife
+  root: <%= Rails.root.join("storage") %>
+
+# Use bin/rails credentials:edit to set the AWS secrets (as aws:access_key_id|secret_access_key)
+# amazon:
+#   service: S3
+#   access_key_id: <%= Rails.application.credentials.dig(:aws, :access_key_id) %>
+#   secret_access_key: <%= Rails.application.credentials.dig(:aws, :secret_access_key) %>
+#   region: us-east-1
+#   bucket: your_own_bucket-<%= Rails.env %>
+
+# Remember not to checkin your GCS keyfile to a repository
+# google:
+#   service: GCS
+#   project: your_project
+#   credentials: <%= Rails.root.join("path/to/gcs.keyfile") %>
+#   bucket: your_own_bucket-<%= Rails.env %>
+
+# Use bin/rails credentials:edit to set the Azure Storage secret (as azure_storage:storage_access_key)
+# microsoft:
+#   service: AzureStorage
+#   storage_account_name: your_account_name
+#   storage_access_key: <%= Rails.application.credentials.dig(:azure_storage, :storage_access_key) %>
+#   container: your_container_name-<%= Rails.env %>
+
+# mirror:
+#   service: Mirror
+#   primary: local
+#   mirrors: [ amazon, google, microsoft ]
diff --git a/example-app/db/migrate/20250831102030_create_active_storage_tables.active_storage.rb b/example-app/db/migrate/20250831102030_create_active_storage_tables.active_storage.rb
new file mode 100644
index 0000000..6bd8bd0
--- /dev/null
+++ b/example-app/db/migrate/20250831102030_create_active_storage_tables.active_storage.rb
@@ -0,0 +1,57 @@
+# This migration comes from active_storage (originally 20170806125915)
+class CreateActiveStorageTables < ActiveRecord::Migration[7.0]
+  def change
+    # Use Active Record's configured type for primary and foreign keys
+    primary_key_type, foreign_key_type = primary_and_foreign_key_types
+
+    create_table :active_storage_blobs, id: primary_key_type do |t|
+      t.string   :key,          null: false
+      t.string   :filename,     null: false
+      t.string   :content_type
+      t.text     :metadata
+      t.string   :service_name, null: false
+      t.bigint   :byte_size,    null: false
+      t.string   :checksum
+
+      if connection.supports_datetime_with_precision?
+        t.datetime :created_at, precision: 6, null: false
+      else
+        t.datetime :created_at, null: false
+      end
+
+      t.index [ :key ], unique: true
+    end
+
+    create_table :active_storage_attachments, id: primary_key_type do |t|
+      t.string     :name,     null: false
+      t.references :record,   null: false, polymorphic: true, index: false, type: foreign_key_type
+      t.references :blob,     null: false, type: foreign_key_type
+
+      if connection.supports_datetime_with_precision?
+        t.datetime :created_at, precision: 6, null: false
+      else
+        t.datetime :created_at, null: false
+      end
+
+      t.index [ :record_type, :record_id, :name, :blob_id ], name: :index_active_storage_attachments_uniqueness, unique: true
+      t.foreign_key :active_storage_blobs, column: :blob_id
+    end
+
+    create_table :active_storage_variant_records, id: primary_key_type do |t|
+      t.belongs_to :blob, null: false, index: false, type: foreign_key_type
+      t.string :variation_digest, null: false
+
+      t.index [ :blob_id, :variation_digest ], name: :index_active_storage_variant_records_uniqueness, unique: true
+      t.foreign_key :active_storage_blobs, column: :blob_id
+    end
+  end
+
+  private
+    def primary_and_foreign_key_types
+      config = Rails.configuration.generators
+      setting = config.options[config.orm][:primary_key_type]
+      primary_key_type = setting || :primary_key
+      foreign_key_type = setting || :bigint
+      [ primary_key_type, foreign_key_type ]
+    end
+end
diff --git a/example-app/db/schema.rb b/example-app/db/schema.rb
index a8f0e44..26d4602 100644
--- a/example-app/db/schema.rb
+++ b/example-app/db/schema.rb
@@ -10,7 +10,35 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2019_05_07_172823) do
+ActiveRecord::Schema[7.0].define(version: 2025_08_31_102030) do
+  create_table "active_storage_attachments", force: :cascade do |t|
+    t.string "name", null: false
+    t.string "record_type", null: false
+    t.bigint "record_id", null: false
+    t.bigint "blob_id", null: false
+    t.datetime "created_at", null: false
+    t.index ["blob_id"], name: "index_active_storage_attachments_on_blob_id"
+    t.index ["record_type", "record_id", "name", "blob_id"], name: "index_active_storage_attachments_uniqueness", unique: true
+  end
+
+  create_table "active_storage_blobs", force: :cascade do |t|
+    t.string "key", null: false
+    t.string "filename", null: false
+    t.string "content_type"
+    t.text "metadata"
+    t.string "service_name", null: false
+    t.bigint "byte_size", null: false
+    t.string "checksum"
+    t.datetime "created_at", null: false
+    t.index ["key"], name: "index_active_storage_blobs_on_key", unique: true
+  end
+
+  create_table "active_storage_variant_records", force: :cascade do |t|
+    t.bigint "blob_id", null: false
+    t.string "variation_digest", null: false
+    t.index ["blob_id", "variation_digest"], name: "index_active_storage_variant_records_uniqueness", unique: true
+  end
+
   create_table "posts", force: :cascade do |t|
     t.string "slug", null: false
     t.string "title", null: false
@@ -20,4 +48,6 @@
     t.index ["slug"], name: "index_posts_on_slug", unique: true
   end
 
+  add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
+  add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
 end
diff --git a/example-app/db/seeds.rb b/example-app/db/seeds.rb
index 6889bd9..538328f 100644
--- a/example-app/db/seeds.rb
+++ b/example-app/db/seeds.rb
@@ -1,4 +1,6 @@
-Rails.root.join('data').children.each do |path|
+plasma_path = File.expand_path('../../spec/fixtures/files/plasma.jpg', __dir__)
+
+Rails.root.join('data').children.each_with_index do |path, i|
   id, slug = path.basename('.*').to_s.split('-', 2)
   title, rest = path.read.split("\n", 2)
 
@@ -7,4 +9,9 @@
   post.slug = slug
   post.title = title
   post.save!
+
+  post.hero.attach(
+    filename: 'plasma.jpg',
+    io: File.open(plasma_path),
+  ) if i.odd?
 end
diff --git a/gemfiles/rails_7.0.gemfile b/gemfiles/rails_7.0.gemfile
index 2bd2332..b52755b 100644
--- a/gemfiles/rails_7.0.gemfile
+++ b/gemfiles/rails_7.0.gemfile
@@ -4,9 +4,20 @@ source "https://rubygems.org"
 
 gem "appraisal"
 gem "rake"
-gem "rspec"
 gem "rubocop"
+gem "image_processing"
+gem "sprockets-rails"
+gem "sqlite3", "<2"
 gem "concurrent-ruby", "< 1.3.5"
 gem "rails", "~> 7.0.0"
 
+group :development, :test do
+  gem "rspec-rails"
+end
+
+group :test do
+  gem "capybara"
+  gem "factory_bot_rails"
+end
+
 gemspec path: "../"
diff --git a/gemfiles/rails_7.1.gemfile b/gemfiles/rails_7.1.gemfile
index 2fb8d4b..be07848 100644
--- a/gemfiles/rails_7.1.gemfile
+++ b/gemfiles/rails_7.1.gemfile
@@ -4,8 +4,19 @@ source "https://rubygems.org"
 
 gem "appraisal"
 gem "rake"
-gem "rspec"
 gem "rubocop"
+gem "image_processing"
+gem "sprockets-rails"
+gem "sqlite3"
 gem "rails", "~> 7.1.0"
 
+group :development, :test do
+  gem "rspec-rails"
+end
+
+group :test do
+  gem "capybara"
+  gem "factory_bot_rails"
+end
+
 gemspec path: "../"
diff --git a/gemfiles/rails_7.2.gemfile b/gemfiles/rails_7.2.gemfile
index eb605c2..8d781ab 100644
--- a/gemfiles/rails_7.2.gemfile
+++ b/gemfiles/rails_7.2.gemfile
@@ -4,8 +4,19 @@ source "https://rubygems.org"
 
 gem "appraisal"
 gem "rake"
-gem "rspec"
 gem "rubocop"
+gem "image_processing"
+gem "sprockets-rails"
+gem "sqlite3"
 gem "rails", "~> 7.2.0"
 
+group :development, :test do
+  gem "rspec-rails"
+end
+
+group :test do
+  gem "capybara"
+  gem "factory_bot_rails"
+end
+
 gemspec path: "../"
diff --git a/gemfiles/rails_8.0.gemfile b/gemfiles/rails_8.0.gemfile
index 34d56ef..b1c712c 100644
--- a/gemfiles/rails_8.0.gemfile
+++ b/gemfiles/rails_8.0.gemfile
@@ -4,8 +4,19 @@ source "https://rubygems.org"
 
 gem "appraisal"
 gem "rake"
-gem "rspec"
 gem "rubocop"
+gem "image_processing"
+gem "sprockets-rails"
+gem "sqlite3"
 gem "rails", "~> 8.0.0"
 
+group :development, :test do
+  gem "rspec-rails"
+end
+
+group :test do
+  gem "capybara"
+  gem "factory_bot_rails"
+end
+
 gemspec path: "../"
diff --git a/spec/factories.rb b/spec/factories.rb
new file mode 100644
index 0000000..46bf428
--- /dev/null
+++ b/spec/factories.rb
@@ -0,0 +1,7 @@
+FactoryBot.define do
+  factory :post do
+    sequence(:slug) { |n| "slug-#{n}" }
+    sequence(:title) { |n| "Title #{n}" }
+    body { 'foo' }
+  end
+end
diff --git a/spec/features/active_storage_spec.rb b/spec/features/active_storage_spec.rb
new file mode 100644
index 0000000..5afe791
--- /dev/null
+++ b/spec/features/active_storage_spec.rb
@@ -0,0 +1,30 @@
+require 'rails_helper'
+
+RSpec.describe 'ActiveStorage integration' do
+  context 'with the Parklife service' do
+    let!(:post1) { FactoryBot.create(:post) }
+    let!(:post2) { FactoryBot.create(:post) }
+
+    before do
+      post1.hero.attach(
+        filename: 'plasma.jpg',
+        io: file_fixture('plasma.jpg').open,
+      )
+    end
+
+    it "works as normal and uses Parklife's blob controller" do
+      visit root_path
+      click_link post2.title
+
+      expect(page).not_to have_css('img')
+
+      click_link 'Home'
+      click_link post1.title
+
+      expect(page).to have_css('img')
+
+      img = find('img')
+      expect(img[:src]).to start_with('/parklife/')
+    end
+  end
+end
diff --git a/spec/fixtures/files/plasma.jpg b/spec/fixtures/files/plasma.jpg
new file mode 100644
index 0000000..8d31ae9
Binary files /dev/null and b/spec/fixtures/files/plasma.jpg differ
diff --git a/spec/parklife/integration_spec.rb b/spec/parklife/integration_spec.rb
new file mode 100644
index 0000000..8156304
--- /dev/null
+++ b/spec/parklife/integration_spec.rb
@@ -0,0 +1,90 @@
+require 'open3'
+
+RSpec.describe 'Integration tests' do
+  def command(cmd, env = {})
+    env = { 'RAILS_ENV' => 'test' }.merge(env)
+
+    Dir.chdir('example-app') do
+      Open3.capture2(env, cmd)
+    end
+  end
+
+  def parklife(cmd, env = {})
+    command("bundle exec parklife #{cmd}", env)
+  end
+
+  it 'gives access to Rails URL helpers when defining routes' do
+    stdout, status = parklife('routes')
+    expect(status).to be_success
+    expect(stdout).to include('/test/middleware', '/test/url')
+  end
+
+  it 'configures Rails default_url_options/relative_url_root when setting a Parklife base' do
+    stdout, status = parklife('get /test/url')
+    expect(status).to be_success
+    expect(stdout.chomp).to eql('http://example.com/test/url')
+
+    stdout, status = parklife('get /test/url --base /foo')
+    expect(status).to be_success
+    expect(stdout.chomp).to eql('http://example.com/foo/test/url')
+
+    stdout, status = parklife('get /test/url --base https://foo.example.org/foo/bar')
+    expect(status).to be_success
+    expect(stdout.chomp).to eql('https://foo.example.org/foo/bar/test/url')
+  end
+
+  it "sets Parklife's base from Rails default_url_options/relative_url_root when they're defined" do
+    stdout, status = parklife('get /test/url', 'PARKLIFE_SET_RAILS_URL' => 'yes')
+    expect(status).to be_success
+    expect(stdout.chomp).to eql('https://rails.example.org/foo/test/url')
+  end
+
+  it "updates Parklife's base with Rails force_ssl setting" do
+    stdout, status = parklife('get /test/url', 'PARKLIFE_SET_RAILS_URL' => 'force_ssl')
+    expect(status).to be_success
+    expect(stdout.chomp).to eql('https://example.com/test/url')
+  end
+
+  it 'host authorization middleware is removed in development - but only for a Parklife request' do
+    env = { 'RAILS_ENV' => 'development' }
+
+    stdout, status = command('bundle exec rails middleware', env)
+    expect(status).to be_success
+    expect(stdout).to include('ActionDispatch::HostAuthorization')
+
+    stdout, status = parklife('get /test/middleware', env)
+    expect(status).to be_success
+    expect(stdout).not_to include('ActionDispatch::HostAuthorization')
+  end
+
+  it 'builds successfully and includes encountered ActiveStorage blobs' do
+    skip('FIXME: get me working on CI') if ENV['CI']
+
+    env = { 'RAILS_ENV' => 'development' }
+
+    stdout, status = parklife('build', env)
+    expect(status).to be_success
+    expect(stdout).not_to be_empty
+
+    Dir.chdir('example-app/build') do
+      build_files = Dir
+        .glob('**/*')
+        .select { |it| File.file?(it) }
+
+      # HTML pages.
+      expect(build_files).to include(
+        'index.html',
+        'posts/hello-again/index.html',
+        'posts/hello-from-parklife/index.html',
+        'posts/magic-number/index.html',
+      )
+
+      # ActiveStorage blobs.
+      expect(
+        build_files
+          .select { |it| it.end_with?('/plasma.jpg') }
+          .size
+      ).to be(2)
+    end
+  end
+end
diff --git a/spec/parklife/rails_spec.rb b/spec/parklife/rails_spec.rb
deleted file mode 100644
index c91a0b8..0000000
--- a/spec/parklife/rails_spec.rb
+++ /dev/null
@@ -1,135 +0,0 @@
-require 'action_controller'
-require 'parklife/application'
-require 'parklife/rails/build_integration'
-
-RSpec.describe 'Parklife Rails integration' do
-  let(:parklife_app) { Parklife::Application.new }
-  let(:rails_app) {
-    Class.new(Rails::Application) do
-      # Silence warning in Rails 7.1.
-      config.active_support.cache_format_version = 7.0
-
-      # Silence warning in Rails 8.0.
-      config.active_support.to_time_preserves_timezone = :zone
-
-      config.eager_load = false
-      config.logger = Logger.new('/dev/null')
-    end
-  }
-
-  def initialize!
-    rails_app.initialize!
-  end
-
-  around do |example|
-    # Initialising each test Rails app in their own current working directory
-    # stops Zeitwerk complaining about the same directory being managed by
-    # different loaders.
-    Dir.mktmpdir do |dir|
-      Dir.chdir dir do
-        example.run
-      end
-    end
-  end
-
-  before do
-    allow(Parklife).to receive(:application).and_return(parklife_app)
-    Rails.application = rails_app
-  end
-
-  after do
-    ActionController::Base.relative_url_root = nil
-    ActiveSupport::Dependencies.autoload_paths = []
-    ActiveSupport::Dependencies.autoload_once_paths = []
-  end
-
-  it 'gives access to Rails URL helpers when defining routes' do
-    initialize!
-
-    rails_app.routes.draw do
-      get :foo, to: proc { [200, {}, 'foo'] }
-    end
-
-    parklife_app.routes do
-      get foo_path
-    end
-
-    route = Parklife::Route.new('/foo', crawl: false)
-    expect(parklife_app.routes).to include(route)
-
-    another_parklife_app = Parklife::Application.new
-
-    expect {
-      another_parklife_app.routes do
-        get foo_path
-      end
-    }.to raise_error(NameError, /foo_path/)
-  end
-
-  it 'configures Rails default_url_options and relative_url_root when setting Parklife base' do
-    initialize!
-
-    parklife_app.config.base = 'https://localhost:3000/foo'
-
-    expect(rails_app.default_url_options).to eql({
-      host: 'localhost:3000',
-      protocol: 'https',
-    })
-    expect(ActionController::Base.relative_url_root).to eql('/foo')
-
-    parklife_app.config.base = 'http://foo.example.com/'
-
-    expect(rails_app.default_url_options).to eql({
-      host: 'foo.example.com',
-      protocol: 'http',
-    })
-    expect(ActionController::Base.relative_url_root).to be_nil
-
-    expect {
-      another_parklife_app = Parklife::Application.new
-      another_parklife_app.config.base = 'https://example.com/foo'
-    }.not_to change {
-      [rails_app.default_url_options, ActionController::Base.relative_url_root]
-    }
-  end
-
-  it 'removes host authorization middleware' do
-    initialize!
-
-    expect(Rails.application.middleware).not_to include(ActionDispatch::HostAuthorization)
-  end
-
-  context 'setting the Parklife base from Rails config on initialize' do
-    it 'uses Parklife defaults when nothing is set' do
-      initialize!
-
-      expect(parklife_app.config.base).to have_attributes(
-        host: 'example.com',
-        path: '',
-        scheme: 'http',
-      )
-    end
-
-    it 'copies the values from default_url_options and relative_url_root' do
-      rails_app.default_url_options = { host: 'foo', protocol: 'bar' }
-      ActionController::Base.relative_url_root = '/baz'
-
-      initialize!
-
-      expect(parklife_app.config.base).to have_attributes(
-        host: 'foo',
-        path: '/baz',
-        scheme: 'bar',
-      )
-    end
-
-    it 'always uses https if force_ssl=true' do
-      rails_app.default_url_options = { protocol: 'foo' }
-      rails_app.config.force_ssl = true
-
-      initialize!
-
-      expect(parklife_app.config.base.scheme).to eql('https')
-    end
-  end
-end
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
new file mode 100644
index 0000000..36437a8
--- /dev/null
+++ b/spec/rails_helper.rb
@@ -0,0 +1,72 @@
+# This file is copied to spec/ when you run 'rails generate rspec:install'
+require 'spec_helper'
+ENV['RAILS_ENV'] ||= 'test'
+require_relative '../example-app/config/environment'
+# Prevent database truncation if the environment is production
+abort("The Rails environment is running in production mode!") if Rails.env.production?
+# Uncomment the line below in case you have `--require rails_helper` in the `.rspec` file
+# that will avoid rails generators crashing because migrations haven't been run yet
+# return unless Rails.env.test?
+require 'rspec/rails'
+# Add additional requires below this line. Rails is not loaded until this point!
+
+require 'factories'
+
+# Requires supporting ruby files with custom matchers and macros, etc, in
+# spec/support/ and its subdirectories. Files matching `spec/**/*_spec.rb` are
+# run as spec files by default. This means that files in spec/support that end
+# in _spec.rb will both be required and run as specs, causing the specs to be
+# run twice. It is recommended that you do not name files matching this glob to
+# end with _spec.rb. You can configure this pattern with the --pattern
+# option on the command line or in ~/.rspec, .rspec or `.rspec-local`.
+#
+# The following line is provided for convenience purposes. It has the downside
+# of increasing the boot-up time by auto-requiring all files in the support
+# directory. Alternatively, in the individual `*_spec.rb` files, manually
+# require only the support files necessary.
+#
+# Rails.root.glob('spec/support/**/*.rb').sort_by(&:to_s).each { |f| require f }
+
+# Ensures that the test database schema matches the current schema file.
+# If there are pending migrations it will invoke `db:test:prepare` to
+# recreate the test database by loading the schema.
+# If you are not using ActiveRecord, you can remove these lines.
+begin
+  ActiveRecord::Migration.maintain_test_schema!
+rescue ActiveRecord::PendingMigrationError => e
+  abort e.to_s.strip
+end
+
+RSpec.configure do |config|
+  # If you're not using ActiveRecord, or you'd prefer not to run each of your
+  # examples within a transaction, remove the following line or assign false
+  # instead of true.
+  config.use_transactional_fixtures = true
+
+  # You can uncomment this line to turn off ActiveRecord support entirely.
+  # config.use_active_record = false
+
+  # RSpec Rails uses metadata to mix in different behaviours to your tests,
+  # for example enabling you to call `get` and `post` in request specs. e.g.:
+  #
+  #     RSpec.describe UsersController, type: :request do
+  #       # ...
+  #     end
+  #
+  # The different available types are documented in the features, such as in
+  # https://rspec.info/features/8-0/rspec-rails
+  #
+  # You can also this infer these behaviours automatically by location, e.g.
+  # /spec/models would pull in the same behaviour as `type: :model` but this
+  # behaviour is considered legacy and will be removed in a future version.
+  #
+  # To enable this behaviour uncomment the line below.
+  config.infer_spec_type_from_file_location!
+
+  # Filter lines from Rails gems in backtraces.
+  config.filter_rails_from_backtrace!
+  # arbitrary gems may also be filtered via:
+  # config.filter_gems_from_backtrace("gem name")
+
+  config.include FactoryBot::Syntax::Methods
+end