Fix tests for group leave feature

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

features/dashboard/group.feature

@@ -24,7 +24,8 @@ Feature: Dashboard Group
     When I visit dashboard groups page
     Then I should see group "Owned" in group list
     Then I should see group "Guest" in group list
-    Then I should not see the "Leave" button for group "Owned"
+    When I click on the "Leave" button for group "Owned"
+    Then I should see the "Can not leave message"
 
   @javascript
   Scenario: Guest should be able to leave from group

features/steps/dashboard/group.rb

@@ -60,4 +60,8 @@ class Spinach::Features::DashboardGroup < Spinach::FeatureSteps
     page.should have_content "Samurai"
     page.should have_content "Tokugawa Shogunate"
   end
+
+  step 'I should see the "Can not leave message"' do
+    page.should have_content "You can not leave Owned group because you're the last owner"
+  end
 end