Clean up test app

test/support/rails_app.rb

@@ -1,27 +1,34 @@
-class ActiveModelSerializers::RailsApplication < Rails::Application
-  if Rails::VERSION::MAJOR >= 4
-    config.eager_load = false
+require 'support/isolated_unit'
+module ActiveModelSerializers
+  RailsApplication = TestHelpers::Generation.make_basic_app do |app|
+    app.configure do
+      config.secret_key_base = 'abc123'
+      config.active_support.test_order = :random
+      config.action_controller.perform_caching = true
+      ActionController::Base.cache_store = :memory_store
+    end
 
-    config.secret_key_base = 'abc123'
-
-    config.active_support.test_order = :random
-
-    config.logger = Logger.new(nil)
-
-    config.action_controller.perform_caching = true
-    ActionController::Base.cache_store = :memory_store
-
-    Rails.application.routes.default_url_options = { host: 'example.com' }
+    app.routes.default_url_options = { host: 'example.com' }
   end
 end
-ActiveModelSerializers::RailsApplication.initialize!
 
-module TestHelper
-  Routes = ActionDispatch::Routing::RouteSet.new
-  Routes.draw do
-    get ':controller(/:action(/:id))'
-    get ':controller(/:action)'
+Routes = ActionDispatch::Routing::RouteSet.new
+Routes.draw do
+  get ':controller(/:action(/:id))'
+  get ':controller(/:action)'
+end
+ActionController::Base.send :include, Routes.url_helpers
+ActionController::TestCase.class_eval do
+  def setup
+    @routes = Routes
   end
 
-  ActionController::Base.send :include, Routes.url_helpers
+  # For Rails5
+  # https://github.com/rails/rails/commit/ca83436d1b3b6cedd1eca2259f65661e69b01909#diff-b9bbf56e85d3fe1999f16317f2751e76L17
+  def assigns(key = nil)
+    warn "DEPRECATION: Calling 'assigns(#{key})' from #{caller[0]}"
+    assigns = {}.with_indifferent_access
+    @controller.view_assigns.each { |k, v| assigns.regular_writer(k, v) }
+    key.nil? ? assigns : assigns[key]
+  end
 end