Allowing multiple rails applications in the same ruby instance.

This change provides the ability to create a new application with a
configuration which can be specified.

1 files changed, 148 insertions, 0 deletions

diff --git a/railties/test/application/multiple_applications_test.rb b/railties/test/application/multiple_applications_test.rb
new file mode 100644
index 0000000000..03c343c475
--- /dev/null
+++ b/railties/test/application/multiple_applications_test.rb
@@ -0,0 +1,148 @@
+require 'isolation/abstract_unit'
+
+module ApplicationTests
+  class MultipleApplicationsTest < ActiveSupport::TestCase
+    include ActiveSupport::Testing::Isolation
+
+    def setup
+      build_app(initializers: true)
+      boot_rails
+      require "#{rails_root}/config/environment"
+    end
+
+    def teardown
+      teardown_app
+    end
+
+    def test_cloning_an_application_makes_a_shallow_copy_of_config
+      clone = Rails.application.clone
+
+      assert_equal Rails.application.config, clone.config, "The cloned application should get a copy of the config"
+      assert_equal Rails.application.config.secret_key_base, clone.config.secret_key_base, "The base secret key on the config should be the same"
+    end
+
+    def test_initialization_of_multiple_copies_of_same_application
+      application1 = AppTemplate::Application.new
+      application2 = AppTemplate::Application.new
+
+      assert_not_equal Rails.application.object_id, application1.object_id, "New applications should not be the same as the original application"
+      assert_not_equal Rails.application.object_id, application2.object_id, "New applications should not be the same as the original application"
+    end
+
+    def test_initialization_of_application_with_previous_config
+      application1 = AppTemplate::Application.new(config: Rails.application.config)
+      application2 = AppTemplate::Application.new
+
+      assert_equal Rails.application.config, application1.config, "Creating a new application while setting an initial config should result in the same config"
+      assert_not_equal Rails.application.config, application2.config, "New applications without setting an initial config should not have the same config"
+    end
+
+    def test_initialization_of_application_with_previous_railties
+      application1 = AppTemplate::Application.new(railties: Rails.application.railties)
+      application2 = AppTemplate::Application.new
+
+      assert_equal Rails.application.railties, application1.railties
+      assert_not_equal Rails.application.railties, application2.railties
+    end
+
+    def test_initialize_new_application_with_all_previous_initialization_variables
+      application1 = AppTemplate::Application.new(
+        config:           Rails.application.config,
+        railties:         Rails.application.railties,
+        routes_reloader:  Rails.application.routes_reloader,
+        reloaders:        Rails.application.reloaders,
+        routes:           Rails.application.routes,
+        helpers:          Rails.application.helpers,
+        app_env_config:   Rails.application.env_config
+      )
+
+      assert_equal Rails.application.config, application1.config
+      assert_equal Rails.application.railties, application1.railties
+      assert_equal Rails.application.routes_reloader, application1.routes_reloader
+      assert_equal Rails.application.reloaders, application1.reloaders
+      assert_equal Rails.application.routes, application1.routes
+      assert_equal Rails.application.helpers, application1.helpers
+      assert_equal Rails.application.env_config, application1.env_config
+    end
+
+    def test_rake_tasks_defined_on_different_applications_go_to_the_same_class
+      $run_count = 0
+
+      application1 = AppTemplate::Application.new
+      application1.rake_tasks do
+        $run_count += 1
+      end
+
+      application2 = AppTemplate::Application.new
+      application2.rake_tasks do
+        $run_count += 1
+      end
+
+      require "#{app_path}/config/environment"
+
+      assert_equal 0, $run_count, "The count should stay at zero without any calls to the rake tasks"
+      require 'rake'
+      require 'rake/testtask'
+      require 'rdoc/task'
+      Rails.application.load_tasks
+      assert_equal 2, $run_count, "Calling a rake task should result in two increments to the count"
+    end
+
+    def test_multiple_applications_can_be_initialized
+      assert_nothing_raised { AppTemplate::Application.new }
+    end
+
+    def test_initializers_run_on_different_applications_go_to_the_same_class
+      application1 = AppTemplate::Application.new
+      $run_count = 0
+
+      AppTemplate::Application.initializer :init0 do
+        $run_count += 1
+      end
+
+      application1.initializer :init1 do
+        $run_count += 1
+      end
+
+      AppTemplate::Application.new.initializer :init2 do
+        $run_count += 1
+      end
+
+      assert_equal 0, $run_count, "Without loading the initializers, the count should be 0"
+
+      # Set config.eager_load to false so that a eager_load warning doesn't pop up
+      AppTemplate::Application.new { config.eager_load = false }.initialize!
+
+      assert_equal 3, $run_count, "There should have been three initializers that incremented the count"
+    end
+
+    def test_runners_run_on_different_applications_go_to_the_same_class
+      $run_count = 0
+      AppTemplate::Application.runner { $run_count += 1 }
+      AppTemplate::Application.new.runner { $run_count += 1 }
+
+      assert_equal 0, $run_count, "Without loading the runners, the count should be 0"
+      Rails.application.load_runner
+      assert_equal 2, $run_count, "There should have been two runners that increment the count"
+    end
+
+    def test_isolate_namespace_on_an_application
+      assert_nil Rails.application.railtie_namespace, "Before isolating namespace, the railtie namespace should be nil"
+      Rails.application.isolate_namespace(AppTemplate)
+      assert_equal Rails.application.railtie_namespace, AppTemplate, "After isolating namespace, we should have a namespace"
+    end
+
+    def test_inserting_configuration_into_application
+      app = AppTemplate::Application.new(config: Rails.application.config)
+      new_config = Rails::Application::Configuration.new("root_of_application")
+      new_config.secret_key_base = "some_secret_key_dude"
+      app.config.secret_key_base = "a_different_secret_key"
+
+      assert_equal "a_different_secret_key", app.config.secret_key_base, "The configuration's secret key should be set."
+      app.config = new_config
+      assert_equal "some_secret_key_dude", app.config.secret_key_base, "The configuration's secret key should have changed."
+      assert_equal "root_of_application", app.config.root, "The root should have changed to the new config's root."
+      assert_equal new_config, app.config, "The application's config should have changed to the new config."
+    end
+  end
+end