Ensure config/application.rb also uses app_const instead of app_name.classify.

railties/lib/rails/generators/rails/app/app_generator.rb

@@ -193,8 +193,12 @@ def app_name
         @app_name ||= File.basename(destination_root)
       end
 
+      def app_const_base
+        @app_const_base ||= app_name.gsub(/\W/, '_').squeeze('_').classify
+      end
+
       def app_const
-        @app_const ||= "#{app_name.gsub(/\W/, '_').squeeze('_').classify}::Application"
+        @app_const ||= "#{app_const_base}::Application"
       end
 
       def valid_app_const?

railties/lib/rails/generators/rails/app/templates/config/application.rb

 require File.expand_path('../boot', __FILE__)
 
-module <%= app_name.classify %>
+module <%= app_const_base %>
   class Application < Rails::Application
     # Settings in config/environments/* take precedence over those specified here.
     # Application configuration should go into files in config/initializers

railties/test/generators/app_generator_test.rb

@@ -61,7 +61,8 @@ def test_invalid_application_name_raises_an_error
 
   def test_invalid_application_name_is_fixed
     silence(:stdout){ Rails::Generators::AppGenerator.start [File.join(destination_root, "things-43")] }
-    assert_file "things-43/config/environment.rb", /Things43::Application/
+    assert_file "things-43/config/environment.rb", /Things43::Application\.initialize!/
+    assert_file "things-43/config/application.rb", /^module Things43$/
   end
 
   def test_config_database_is_added_by_default