set engine's route in the functional test is generated in the engine

railties/lib/rails/generators/test_unit/controller/templates/functional_test.rb

@@ -2,6 +2,12 @@
 
 <% module_namespacing do -%>
 class <%= class_name %>ControllerTest < ActionController::TestCase
+<% if defined?(ENGINE_ROOT) -%>
+  setup do
+    @routes = Engine.routes
+  end
+
+<% end -%>
 <% if actions.empty? -%>
   # test "the truth" do
   #   assert true

railties/lib/rails/generators/test_unit/scaffold/scaffold_generator.rb

@@ -15,6 +15,15 @@ def create_test_files
                  File.join("test/controllers", controller_class_path, "#{controller_file_name}_controller_test.rb")
       end
 
+      def fixture_name
+        @fixture_name ||=
+          if defined?(ENGINE_ROOT)
+            namespaced_path + "_" + table_name
+          else
+            table_name
+          end
+      end
+
       private
 
         def attributes_hash

railties/lib/rails/generators/test_unit/scaffold/templates/functional_test.rb

@@ -3,7 +3,10 @@
 <% module_namespacing do -%>
 class <%= controller_class_name %>ControllerTest < ActionController::TestCase
   setup do
-    @<%= singular_table_name %> = <%= table_name %>(:one)
+    @<%= singular_table_name %> = <%= fixture_name %>(:one)
+<% if defined?(ENGINE_ROOT) -%>
+    @routes = Engine.routes
+<% end -%>
   end
 
   test "should get index" do

railties/test/generators/scaffold_controller_generator_test.rb

@@ -174,4 +174,15 @@ def test_model_name_option
       end
     end
   end
+
+  def test_controller_tests_pass_by_default_inside_mountable_engine
+    Dir.chdir(destination_root) { `bundle exec rails plugin new bukkits --mountable` }
+
+    engine_path = File.join(destination_root, "bukkits")
+
+    Dir.chdir(engine_path) do
+      quietly { `bin/rails g controller dashboard foo` }
+      assert_match(/2 runs, 2 assertions, 0 failures, 0 errors/, `bundle exec rake test 2>&1`)
+    end
+  end
 end

railties/test/generators/scaffold_generator_test.rb

@@ -393,4 +393,18 @@ def test_scaffold_generator_password_digest
       assert_match(/password_digest: <%= BCrypt::Password.create\('secret'\) %>/, content)
     end
   end
+
+  def test_scaffold_tests_pass_by_default_inside_mountable_engine
+    Dir.chdir(destination_root) { `bundle exec rails plugin new bukkits --mountable` }
+
+    engine_path = File.join(destination_root, "bukkits")
+
+    Dir.chdir(engine_path) do
+      quietly do
+        `bin/rails g scaffold User name:string age:integer;
+        bundle exec rake db:migrate`
+      end
+      assert_match(/8 runs, 13 assertions, 0 failures, 0 errors/, `bundle exec rake test 2>&1`)
+    end
+  end
 end