add drag and drop feature for dependencies

features/dependencies.feature

@@ -0,0 +1,20 @@
+Feature: dependencies
+
+  As a Tracks user
+  In order to keep track of complex todos
+  I want to assign and manage todo dependencies
+
+  Background:
+    Given the following user record
+      | login    | password | is_admin |
+      | testuser | secret   | false    |
+    And I have logged in as "testuser" with password "secret"
+
+  @selenium
+  Scenario: Adding dependency to dependency
+  Given I have 3 todos
+  And "todo 2" depends on "todo 1"
+  When I go to the home page
+  And I drag "todo 3" to "todo 1"
+  Then the dependencies of "todo 1" should include "todo 2"
+  And the dependencies of "todo 1" should include "todo 3"

features/step_definitions/todo_steps.rb

@@ -24,8 +24,30 @@ Given /^I have ([0-9]+) completed todos$/ do |count|
   end
 end
 
+Given /^"(.*)" depends on "(.*)"$/ do |successor_name, predecessor_name|
+  successor = Todo.find_by_description(successor_name)
+  predecessor = Todo.find_by_description(predecessor_name)
+  
+  successor.add_predecessor(predecessor)
+  successor.state = "pending"
+  successor.save!
+end
+
+When /^I drag "(.*)" to "(.*)"$/ do |dragged, target|
+  drag_id = Todo.find_by_description(dragged).id
+  drop_id = Todo.find_by_description(target).id
+  drag_name = "xpath=//div[@id='line_todo_#{drag_id}']//img[@class='grip']"
+  drop_name = "xpath=//div[@id='line_todo_#{drop_id}']//div[@class='description']"
+  selenium.drag_and_drop_to_object(drag_name, drop_name)
+end
+
 Then /^I should see ([0-9]+) todos$/ do |count|
   count.to_i.downto 1 do |i|
     match_xpath "div["
   end
+end
+
+Then /^the dependencies of "(.*)" should include "(.*)"$/ do |parent_name, child_name|
+   parent_id = Todo.find_by_description(parent_name).id
+   assert_contain(parent_name)
 end

features/support/selenium.rb

@@ -2,6 +2,7 @@ Webrat.configure do |config|
   config.mode = :selenium
   config.application_environment = :selenium
   config.selenium_browser_startup_timeout = 30
+  #config.selenium_server_address = "localhost"
 end
 
 Cucumber::Rails::World.use_transactional_fixtures = false