Added a cucumber feature for the dashboard section option :if

Author: gregbell

features/dashboard.feature

@@ -24,3 +24,21 @@ Feature: Dashboard
     Then I should not see the default welcome message
     And I should see a dashboard widget "Hello World"
     And I should see "Hello world from the content"
+
+  Scenario: Displaying a dashboard widget using the ':if' option
+    Given a configuration of:
+      """
+      ActiveAdmin::Dashboards.build do
+        section 'Hello World', :if => proc{ current_admin_user } do
+          "Hello world from the content"
+        end
+
+        section 'Hidden by If', :if => proc{ false } do
+          "Hello world from the content"
+        end
+      end
+      """
+    When I go to the dashboard
+    Then I should not see the default welcome message
+    And I should see a dashboard widget "Hello World"
+    And I should not see a dashboard widget "Hidden by If"

features/step_definitions/dashboard_steps.rb

@@ -7,5 +7,9 @@
 end
 
 Then /^I should see a dashboard widget "([^"]*)"$/ do |name|
-  Then %{I should see "#{name}" within ".dashboard .panel h3"}
+  page.should have_css('.dashboard .panel h3', :text => name) 
+end
+
+Then /^I should not see a dashboard widget "([^"]*)"$/ do |name|
+  page.should_not have_css('.dashboard .panel h3', :text => name) 
 end