diff --git a/bin/flowerbox b/bin/flowerbox
index 1ffc87b..459c9df 100755
--- a/bin/flowerbox
+++ b/bin/flowerbox
@@ -22,6 +22,17 @@ class Flowerbox::CLI < Thor
     end
   end
 
+  desc "transplant DIR", "Convert an existing Jasmine gem-style project to Flowerbox"
+  def transplant(dir)
+    Flowerbox.transplant(dir)
+  end
+
+  desc "clean", "Clean the Sprockets cache"
+  def clean
+    FileUtils.rm_rf(Flowerbox::CACHE_DIR)
+    puts "Sprockets cache cleaned."
+  end
+
   default_task :test
 
   no_tasks do
diff --git a/lib/flowerbox.rb b/lib/flowerbox.rb
index 1fa9453..8c9caa2 100644
--- a/lib/flowerbox.rb
+++ b/lib/flowerbox.rb
@@ -17,6 +17,12 @@ module Flowerbox
 
   require 'flowerbox/reporter'
 
+  if defined?(Rails::Engine)
+    require 'flowerbox/rails/engine'
+  end
+
+  CACHE_DIR = '.tmp-sprockets'
+
   class << self
     attr_writer :reporters
     attr_accessor :port
@@ -103,6 +109,12 @@ module Flowerbox
 
       @browsers = {}
     end
+
+    def transplant(dir)
+      Flowerbox::TestEnvironment.transplantable_environments.each do |env|
+        break if env.transplant(dir)
+      end
+    end
   end
 end
 
diff --git a/lib/flowerbox/rack.rb b/lib/flowerbox/rack.rb
index 7d6f496..060bf80 100644
--- a/lib/flowerbox/rack.rb
+++ b/lib/flowerbox/rack.rb
@@ -66,6 +66,8 @@ module Flowerbox
     get %r{^/__F__/(.*)$} do |file|
       asset = sprockets.asset_for(file, :bundle => false)
 
+      halt(404) if !asset
+
       content_type asset.content_type
       asset.body
     end
diff --git a/lib/flowerbox/rails/engine.rb b/lib/flowerbox/rails/engine.rb
new file mode 100644
index 0000000..37d4c11
--- /dev/null
+++ b/lib/flowerbox/rails/engine.rb
@@ -0,0 +1,15 @@
+require 'rails/engine'
+
+module Flowerbox
+  module Rails
+    class Engine < ::Rails::Engine
+      rake_tasks do
+        require 'flowerbox/task'
+
+        Flowerbox::Task.create("flowerbox:spec", :dir => "spec/javascripts")
+        Flowerbox::Task.create("flowerbox:integration", :dir => "js-features")
+      end
+    end
+  end
+end
+
diff --git a/lib/flowerbox/runner/node.rb b/lib/flowerbox/runner/node.rb
index f67a5e4..f0fc59b 100644
--- a/lib/flowerbox/runner/node.rb
+++ b/lib/flowerbox/runner/node.rb
@@ -22,7 +22,7 @@ module Flowerbox
 
       def configured?
         File.directory?(File.join(Dir.pwd, 'node_modules/jsdom')) &&
-        File.directory?(File.join(Dir.pwd, 'node_modules/XMLHttpRequest'))
+        File.directory?(File.join(Dir.pwd, 'node_modules/xmlhttprequest'))
       end
 
       def cleanup ; end
diff --git a/lib/flowerbox/runner/selenium.rb b/lib/flowerbox/runner/selenium.rb
index e45334b..770389c 100644
--- a/lib/flowerbox/runner/selenium.rb
+++ b/lib/flowerbox/runner/selenium.rb
@@ -71,7 +71,7 @@ HTML
       end
 
       def template_files
-        sprockets.files.collect { |file| %{<script type="text/javascript" src="/__F__/#{file.logical_path}"></script>} }
+        sprockets.files.collect { |file| %{<script type="text/javascript" src="/__F__/#{sprockets.logical_path_for(file)}"></script>} }
       end
     end
   end
diff --git a/lib/flowerbox/sprockets_handler.rb b/lib/flowerbox/sprockets_handler.rb
index ab03391..a0bb219 100644
--- a/lib/flowerbox/sprockets_handler.rb
+++ b/lib/flowerbox/sprockets_handler.rb
@@ -20,7 +20,7 @@ module Flowerbox
 
       require 'flowerbox/unique_asset_list'
 
-      @files = Flowerbox::UniqueAssetList.new
+      @files = Flowerbox::UniqueAssetList.new(self)
     end
 
     def add(asset)
@@ -39,7 +39,7 @@ module Flowerbox
       return @environment if @environment
 
       @environment = Sprockets::Environment.new
-      @environment.cache = Sprockets::Cache::FileStore.new(".tmp")
+      @environment.cache = Sprockets::Cache::FileStore.new(Flowerbox::CACHE_DIR)
 
       self.class.gem_asset_paths.each { |path| append_path(path) }
       options[:asset_paths].each { |path| append_path(path) }
@@ -54,6 +54,18 @@ module Flowerbox
     def add_paths_for_compiled_asset(path)
       asset_for(path, :bundle => false).to_a.each { |file_path| @files.add(file_path) }
     end
+
+    def logical_path_for(asset)
+      asset_path = asset.pathname.to_s
+
+      environment.paths.each do |path|
+        if asset_path[%r{^#{path}}]
+          return asset_path.gsub(%r{^#{path}/}, '')
+        end
+      end
+
+      raise StandardError.new("Could not find logical path for #{asset_path}")
+    end
   end
 end
 
diff --git a/lib/flowerbox/test_environment.rb b/lib/flowerbox/test_environment.rb
index 33de4f7..5362178 100644
--- a/lib/flowerbox/test_environment.rb
+++ b/lib/flowerbox/test_environment.rb
@@ -2,12 +2,18 @@ module Flowerbox
   module TestEnvironment
     extend Flowerbox::CoreExt::Module
 
-    class << self
-      def for(env)
-        require "flowerbox/test_environment/#{env}"
+    def self.for(env)
+      require "flowerbox/test_environment/#{env}"
 
-        find_constant(env).new
+      find_constant(env).new
+    end
+
+    def self.transplantable_environments
+      Dir[File.expand_path('../test_environment/*.rb', __FILE__)].each do |file|
+        require file
       end
+
+      constants.collect { |k| const_get(k) }.find_all(&:transplantable?)
     end
   end
 end
diff --git a/lib/flowerbox/test_environment/base.rb b/lib/flowerbox/test_environment/base.rb
index 26871e8..b361d14 100644
--- a/lib/flowerbox/test_environment/base.rb
+++ b/lib/flowerbox/test_environment/base.rb
@@ -13,6 +13,10 @@ module Flowerbox
         @reporters ||= []
       end
 
+      def self.transplantable?
+        respond_to?(:transplant)
+      end
+
       def set_additional_options(opts = nil)
         @options = {}
 
diff --git a/lib/flowerbox/test_environment/jasmine.rb b/lib/flowerbox/test_environment/jasmine.rb
index 729a83b..e171e12 100644
--- a/lib/flowerbox/test_environment/jasmine.rb
+++ b/lib/flowerbox/test_environment/jasmine.rb
@@ -1,9 +1,56 @@
 require 'flowerbox/test_environment/base'
 require 'jasmine-core'
+require 'yaml'
 
 module Flowerbox
   module TestEnvironment
     class Jasmine < Base
+      def self.transplant(dir)
+        if File.file?(jasmine_yml = File.join(dir, 'support/jasmine.yml'))
+          puts "Transplanting #{jasmine_yml} into Flowerbox..."
+
+          config = [
+            %{f.test_with :jasmine},
+            %{f.run_with :firefox},
+            %{f.report_with :verbose}
+          ]
+
+          YAML.load_file(jasmine_yml).each do |key, value|
+            case key
+            when 'src_dir'
+              [ value ].flatten.each do |dir|
+                config << %{f.asset_paths << "#{dir}"}
+              end
+            when 'src_files'
+              [ value ].flatten.each do |file|
+                config << %{f.additional_files << "#{file}"}
+              end
+            when 'helpers'
+              [ value ].flatten.each do |pattern|
+                Dir[File.join(dir, pattern)].each do |file|
+                  config << %{f.additional_files << "#{file.gsub("#{dir}/", '')}"}
+                end
+              end
+            when 'spec_files'
+              [ value ].flatten.each do |pattern|
+                config << %{f.spec_patterns << "#{pattern}"}
+              end
+            end
+          end
+
+          File.open(target = File.join(dir, 'spec_helper.rb'), 'wb') do |fh|
+            fh.puts "Flowerbox.configure do |f|"
+            config.each do |line|
+              fh.puts "  #{line}"
+            end
+            fh.puts "end"
+          end
+
+          puts "#{target} created. Run your tests with:"
+          puts "  flowerbox test #{dir}"
+        end
+      end
+
       def inject_into(sprockets)
         sprockets.append_path(::Jasmine::Core.path)
 
diff --git a/lib/flowerbox/unique_asset_list.rb b/lib/flowerbox/unique_asset_list.rb
index 8011b9d..03353a7 100644
--- a/lib/flowerbox/unique_asset_list.rb
+++ b/lib/flowerbox/unique_asset_list.rb
@@ -1,11 +1,19 @@
 module Flowerbox
   class UniqueAssetList < ::Array
+    attr_reader :sprockets
+
+    def initialize(sprockets)
+      super([])
+
+      @sprockets = sprockets
+    end
+
     def add(files)
       [ files ].flatten.each { |file| self << file if !include?(file) }
     end
 
     def to_json
-      collect(&:logical_path)
+      collect { |file| sprockets.logical_path_for(file) }
     end
 
     private