# frozen_string_literal: true
require "isolation/abstract_unit"
require "active_support/dependencies/zeitwerk_integration"
class ZeitwerkIntegrationTest < ActiveSupport::TestCase
include ActiveSupport::Testing::Isolation
def setup
build_app
end
def boot(env = "development")
app(env)
end
def teardown
teardown_app
end
def deps
ActiveSupport::Dependencies
end
def decorated?
deps.singleton_class < deps::ZeitwerkIntegration::Decorations
end
test "ActiveSupport::Dependencies is decorated by default" do
boot
assert decorated?
assert Rails.autoloaders.zeitwerk_enabled?
assert_instance_of Zeitwerk::Loader, Rails.autoloaders.main
assert_instance_of Zeitwerk::Loader, Rails.autoloaders.once
assert_equal [Rails.autoloaders.main, Rails.autoloaders.once], Rails.autoloaders.to_a
end
test "ActiveSupport::Dependencies is not decorated in classic mode" do
add_to_config "config.autoloader = :classic"
boot
assert_not decorated?
assert_not Rails.autoloaders.zeitwerk_enabled?
assert_nil Rails.autoloaders.main
assert_nil Rails.autoloaders.once
assert_equal 0, Rails.autoloaders.count
end
test "autoloaders inflect with Active Support" do
app_file "config/initializers/inflections.rb", <<-RUBY
ActiveSupport::Inflector.inflections(:en) do |inflect|
inflect.acronym 'RESTful'
end
RUBY
app_file "app/controllers/restful_controller.rb", <<-RUBY
class RESTfulController < ApplicationController
end
RUBY
boot
basename = "restful_controller"
abspath = "#{Rails.root}/app/controllers/#{basename}.rb"
camelized = "RESTfulController"
Rails.autoloaders.each do |autoloader|
assert_equal camelized, autoloader.inflector.camelize(basename, abspath)
end
assert RESTfulController
end
test "constantize returns the value stored in the constant" do
app_file "app/models/admin/user.rb", "class Admin::User; end"
boot
assert_same Admin::User, deps.constantize("Admin::User")
end
test "constantize raises if the constant is unknown" do
boot
assert_raises(NameError) { deps.constantize("Admin") }
end
test "safe_constantize returns the value stored in the constant" do
app_file "app/models/admin/user.rb", "class Admin::User; end"
boot
assert_same Admin::User, deps.safe_constantize("Admin::User")
end
test "safe_constantize returns nil for unknown constants" do
boot
assert_nil deps.safe_constantize("Admin")
end
test "autoloaded_constants returns autoloaded constant paths" do
app_file "app/models/admin/user.rb", "class Admin::User; end"
app_file "app/models/post.rb", "class Post; end"
boot
assert Admin::User
assert_equal ["Admin", "Admin::User"], deps.autoloaded_constants
end
test "autoloaded? says if a constant has been autoloaded" do
app_file "app/models/user.rb", "class User; end"
app_file "app/models/post.rb", "class Post; end"
boot
assert Post
assert deps.autoloaded?("Post")
assert deps.autoloaded?(Post)
assert_not deps.autoloaded?("User")
end
test "eager loading loads the application code" do
$zeitwerk_integration_test_user = false
$zeitwerk_integration_test_post = false
app_file "app/models/user.rb", "class User; end; $zeitwerk_integration_test_user = true"
app_file "app/models/post.rb", "class Post; end; $zeitwerk_integration_test_post = true"
boot("production")
assert $zeitwerk_integration_test_user
assert $zeitwerk_integration_test_post
end
test "eager loading loads code in engines" do
$test_blog_engine_eager_loaded = false
engine("blog") do |bukkit|
bukkit.write("lib/blog.rb", "class BlogEngine < Rails::Engine; end")
bukkit.write("app/models/post.rb", "Post = $test_blog_engine_eager_loaded = true")
end
boot("production")
assert $test_blog_engine_eager_loaded
end
test "eager loading loads anything managed by Zeitwerk" do
$zeitwerk_integration_test_user = false
app_file "app/models/user.rb", "class User; end; $zeitwerk_integration_test_user = true"
$zeitwerk_integration_test_extras = false
app_dir "extras"
app_file "extras/webhook_hacks.rb", "WebhookHacks = 1; $zeitwerk_integration_test_extras = true"
require "zeitwerk"
autoloader = Zeitwerk::Loader.new
autoloader.push_dir("#{app_path}/extras")
autoloader.setup
boot("production")
assert $zeitwerk_integration_test_user
assert $zeitwerk_integration_test_extras
end
test "autoload directories not present in eager load paths are not eager loaded" do
$zeitwerk_integration_test_user = false
app_file "app/models/user.rb", "class User; end; $zeitwerk_integration_test_user = true"
$zeitwerk_integration_test_lib = false
app_dir "lib"
app_file "lib/webhook_hacks.rb", "WebhookHacks = 1; $zeitwerk_integration_test_lib = true"
$zeitwerk_integration_test_extras = false
app_dir "extras"
app_file "extras/websocket_hacks.rb", "WebsocketHacks = 1; $zeitwerk_integration_test_extras = true"
add_to_config "config.autoload_paths << '#{app_path}/lib'"
add_to_config "config.autoload_once_paths << '#{app_path}/extras'"
boot("production")
assert $zeitwerk_integration_test_user
assert !$zeitwerk_integration_test_lib
assert !$zeitwerk_integration_test_extras
assert WebhookHacks
assert WebsocketHacks
assert $zeitwerk_integration_test_lib
assert $zeitwerk_integration_test_extras
end
test "autoload_paths are set as root dirs of main, and in the same order" do
boot
existing_autoload_paths = deps.autoload_paths.select { |dir| File.directory?(dir) }
assert_equal existing_autoload_paths, Rails.autoloaders.main.dirs
end
test "autoload_once_paths go to the once autoloader, and in the same order" do
extras = %w(e1 e2 e3)
extras.each do |extra|
app_dir extra
add_to_config %(config.autoload_once_paths << "\#{Rails.root}/#{extra}")
end
boot
extras = extras.map { |extra| "#{app_path}/#{extra}" }
extras.each do |extra|
assert_not_includes Rails.autoloaders.main.dirs, extra
end
assert_equal extras, Rails.autoloaders.once.dirs
end
test "clear reloads the main autoloader, and does not reload the once one" do
boot
$zeitwerk_integration_reload_test = []
main_autoloader = Rails.autoloaders.main
def main_autoloader.reload
$zeitwerk_integration_reload_test << :main_autoloader
super
end
once_autoloader = Rails.autoloaders.once
def once_autoloader.reload
$zeitwerk_integration_reload_test << :once_autoloader
super
end
ActiveSupport::Dependencies.clear
assert_equal %i(main_autoloader), $zeitwerk_integration_reload_test
end
test "verbose = true sets the dependencies logger if present" do
boot
logger = Logger.new(File::NULL)
ActiveSupport::Dependencies.logger = logger
ActiveSupport::Dependencies.verbose = true
Rails.autoloaders.each do |autoloader|
assert_same logger, autoloader.logger
end
end
test "verbose = true sets the Rails logger as fallback" do
boot
ActiveSupport::Dependencies.verbose = true
Rails.autoloaders.each do |autoloader|
assert_same Rails.logger, autoloader.logger
end
end
test "verbose = false sets loggers to nil" do
boot
ActiveSupport::Dependencies.verbose = true
Rails.autoloaders.each do |autoloader|
assert autoloader.logger
end
ActiveSupport::Dependencies.verbose = false
Rails.autoloaders.each do |autoloader|
assert_nil autoloader.logger
end
end
test "unhooks" do
boot
assert_equal Module, Module.method(:const_missing).owner
assert_equal :no_op, deps.unhook!
end
test "autoloaders.logger=" do
boot
logger = ->(_msg) { }
Rails.autoloaders.logger = logger
Rails.autoloaders.each do |autoloader|
assert_same logger, autoloader.logger
end
Rails.autoloaders.logger = Rails.logger
Rails.autoloaders.each do |autoloader|
assert_same Rails.logger, autoloader.logger
end
Rails.autoloaders.logger = nil
Rails.autoloaders.each do |autoloader|
assert_nil autoloader.logger
end
end
end