adds comments clarifying the role of SharedGeneratorTests

railties/test/generators/app_generator_test.rb

@@ -39,6 +39,8 @@
 class AppGeneratorTest < Rails::Generators::TestCase
   include GeneratorsTestHelper
   arguments [destination_root]
+
+  # brings setup, teardown, and some tests
   include SharedGeneratorTests
 
   def default_files

railties/test/generators/plugin_new_generator_test.rb

@@ -22,6 +22,8 @@ class PluginNewGeneratorTest < Rails::Generators::TestCase
   include GeneratorsTestHelper
   destination File.join(Rails.root, "tmp/bukkits")
   arguments [destination_root]
+
+  # brings setup, teardown, and some tests
   include SharedGeneratorTests
 
   def default_files

railties/test/generators/shared_generator_tests.rb

+#
+# Tests, setup, and teardown common to the application and plugin generator suites.
+#
 module SharedGeneratorTests
   def setup
     Rails.application = TestApp::Application