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@@ -29,4 +29,82 @@ task :cruise do
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   ['db:migrate', 'test', 'test:plugins'].each do |t|
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     Rake::Task[t].invoke
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   end  
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+end
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+
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+namespace :test do
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+  
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+  def test_app_dir
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+    File.join(File.dirname(__FILE__), 'test_app')
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+  end
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+  
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+  def mirror_test_files(src, dest=nil)
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+    destination_dir = File.join(*([test_app_dir, dest].compact))
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+    FileUtils.cp_r(File.join(File.dirname(__FILE__), 'test', src), destination_dir)
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+  end
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+  
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+  def append_engines_test_helper
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+    File.open(File.join(test_app_dir, *%w[test test_helper.rb]), 'a') do |f|
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+      f.puts # a blank line
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+      f.puts "require 'engines_test_helper'"
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+    end
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+  end
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+  
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+  def link_engines_plugin
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+    system "ln -s #{File.expand_path(File.dirname(__FILE__))} #{test_app_dir}/vendor/plugins/engines"
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+  end
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+  
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+  def insert_engines_boot_loader_line
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+    environment_rb_file = File.join(test_app_dir, 'config', 'environment.rb')
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+    environment_rb_lines = File.readlines(environment_rb_file)
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+    first_initializer_line = environment_rb_lines.find { |line| line =~ /\ARails::Initializer/ }
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+    index = environment_rb_lines.index(first_initializer_line)
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+    environment_rb_lines.insert(index, "require File.join(File.dirname(__FILE__), '../vendor/plugins/engines/boot')\n")
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+    File.open(environment_rb_file, 'w') { |f| f.write environment_rb_lines.join("\n") }
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+  end
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+  
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+  def create_database_yml
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+    File.open(File.join(test_app_dir, 'config', 'database.yml'), 'w') do |f|
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+      f.write <<-YML
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+development:
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+  adapter: sqlite3
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+  database: engines_development.sqlite3
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+test:
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+  adapter: sqlite3
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+  database: engines_test.sqlite3
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+      YML
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+    end
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+  end
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+  
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+  task :clean do
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+    FileUtils.rm_r(test_app_dir) if File.exist?(test_app_dir)
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+  end
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+  
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+  task :generate_app do
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+    if ENV['edge']
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+      vendor_dir = File.join(test_app_dir, 'vendor')
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+      FileUtils.mkdir_p vendor_dir
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+      system "cd #{vendor_dir} && git clone --depth 1 git://github.com/rails/rails.git"
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+      system "ruby #{File.join(vendor_dir, 'rails', 'railties', 'bin', 'rails')} #{test_app_dir}"
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+    else
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+      system "rails #{test_app_dir}"
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+    end
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+  end
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+  
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+  task :prepare_app do
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+    mirror_test_files('app')
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+    mirror_test_files('lib')
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+    mirror_test_files('plugins', 'vendor')
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+    mirror_test_files('unit', 'test')
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+    mirror_test_files('functional', 'test')
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+    append_engines_test_helper
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+    link_engines_plugin
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+    insert_engines_boot_loader_line
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+    create_database_yml
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+    FileUtils.cp(File.join(File.dirname(__FILE__), *%w[test schema.rb]), 
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+                 File.join(test_app_dir, 'db'))
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+    system "cd #{test_app_dir} && rake db:schema:load"
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+  end
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+  
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+  desc 'Prepare the engines test environment'
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+  task :prepare => [:clean, :generate_app, :prepare_app]
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 end
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