create_dummy_app method that allows to easily create dummy application from template

railties/lib/rails/generators/rails/plugin_new/plugin_new_generator.rb

@@ -37,13 +37,19 @@ module Rails
     def test
       template "test/test_helper.rb"
       template "test/%name%_test.rb"
+      append_file "Rakefile", <<-EOF
+#{rakefile_test_tasks}
+
+task :default => :test
+      EOF
       if full?
         template "test/integration/navigation_test.rb"
       end
     end
 
-    def generate_test_dummy
+    def generate_test_dummy(force = false)
       opts = (options || {}).slice(:skip_active_record, :skip_javascript, :database, :javascript)
+      opts[:force] = force
 
       invoke Rails::Generators::AppGenerator,
         [ File.expand_path(dummy_path, destination_root) ], opts
@@ -70,33 +76,12 @@ module Rails
       end
     end
 
-    def script
-      directory "script" do |content|
+    def script(force = false)
+      directory "script", :force => force do |content|
         "#{shebang}\n" + content
       end
       chmod "script", 0755, :verbose => false
     end
-
-    def rakefile_test_tasks
-      <<-RUBY
-require 'rake/testtask'
-
-Rake::TestTask.new(:test) do |t|
-  t.libs << 'lib'
-  t.libs << 'test'
-  t.pattern = 'test/**/*_test.rb'
-  t.verbose = false
-end
-      RUBY
-    end
-
-    def dummy_path
-      "#{test_path}/dummy"
-    end
-
-    def test_path
-      "test"
-    end
   end
 
   module Generators
@@ -143,7 +128,7 @@ end
 
       def create_test_dummy_files
         return if options[:skip_test_unit]
-        create_test_dummy(dummy_path)
+        create_dummy_app
       end
 
       def finish_template
@@ -153,13 +138,17 @@ end
       public_task :apply_rails_template, :bundle_if_dev_or_edge
 
     protected
-      def create_test_dummy(dummy_path)
+      def create_dummy_app(path = nil)
+        dummy_path(path) if path
+
         say_status :vendor_app, dummy_path
         mute do
           build(:generate_test_dummy)
           store_application_definition!
           build(:test_dummy_config)
           build(:test_dummy_clean)
+          # ensure that script/rails has proper dummy_path
+          build(:script, true)
         end
       end
 
@@ -205,10 +194,22 @@ end
         defined?(::PluginBuilder) ? ::PluginBuilder : Rails::PluginBuilder
       end
 
-      [:test_path, :dummy_path, :rakefile_test_tasks].each do |name|
-        define_method name do
-          builder.send(name) if builder.respond_to?(name)
-        end
+      def rakefile_test_tasks
+        <<-RUBY
+require 'rake/testtask'
+
+Rake::TestTask.new(:test) do |t|
+  t.libs << 'lib'
+  t.libs << 'test'
+  t.pattern = 'test/**/*_test.rb'
+  t.verbose = false
+end
+        RUBY
+      end
+
+      def dummy_path(path = nil)
+        @dummy_path = path if path
+        @dummy_path || "test/dummy"
       end
 
       def mute(&block)

railties/lib/rails/generators/rails/plugin_new/templates/Rakefile

@@ -9,12 +9,6 @@ end
 require 'rake'
 require 'rake/rdoctask'
 
-<% unless options[:skip_test_unit] -%>
-<%= rakefile_test_tasks %>
-
-task :default => :test
-<% end -%>
-
 Rake::RDocTask.new(:rdoc) do |rdoc|
   rdoc.rdoc_dir = 'rdoc'
   rdoc.title    = '<%= camelized %>'

railties/lib/rails/generators/rails/plugin_new/templates/script/rails.tt

@@ -2,4 +2,4 @@
 # This command will automatically be run when you run "rails" with Rails 3 gems installed from the root of your application.
 
 ENGINE_PATH = File.expand_path('../..',  __FILE__)
-load File.expand_path('../../<%= test_path %>/dummy/script/rails',  __FILE__)
+load File.expand_path('../../<%= dummy_path %>/script/rails',  __FILE__)

railties/test/fixtures/lib/create_test_dummy_template.rb

@@ -0,0 +1 @@
+create_dummy_app("spec/dummy")

railties/test/fixtures/lib/plugin_builders/spec_builder.rb

@@ -1,13 +1,19 @@
 class PluginBuilder < Rails::PluginBuilder
   def test
     create_file "spec/spec_helper.rb"
+    append_file "Rakefile", <<-EOF
+# spec tasks in rakefile
+
+task :default => :spec
+    EOF
   end
 
-  def test_path
-    "spec"
+  def generate_test_dummy
+    dummy_path("spec/dummy")
+    super
   end
 
-  def rakefile_test_tasks
-    "# spec tasks in rakefile"
+  def skip_test_unit?
+    true
   end
 end

railties/test/generators/plugin_new_generator_test.rb

@@ -56,6 +56,13 @@ class PluginNewGeneratorTest < Rails::Generators::TestCase
     assert_no_match /It works from file!.*It works_from_file/, run_generator([destination_root, "-m", "lib/template.rb"])
   end
 
+  def test_ensure_that_test_dummy_can_be_generated_from_a_template
+    FileUtils.cd(Rails.root)
+    run_generator([destination_root, "-m", "lib/create_test_dummy_template.rb", "--skip-test-unit"])
+    assert_file "spec/dummy"
+    assert_no_file "test"
+  end
+
   def test_database_entry_is_assed_by_default_in_full_mode
     run_generator([destination_root, "--full"])
     assert_file "test/dummy/config/database.yml", /sqlite/
@@ -143,9 +150,9 @@ class CustomPluginGeneratorTest < Rails::Generators::TestCase
     FileUtils.cd(destination_root)
     run_generator([destination_root, "-b", "#{Rails.root}/lib/plugin_builders/spec_builder.rb"])
     assert_file 'spec/spec_helper.rb'
+    assert_file 'spec/dummy'
     assert_file 'Rakefile', /task :default => :spec/
     assert_file 'Rakefile', /# spec tasks in rakefile/
-    assert_file 'spec/dummy'
     assert_file 'script/rails', %r{spec/dummy}
   end