add event_invite to facebook_session

lib/facebooker/session.rb

@@ -334,6 +334,14 @@ def cancel_event(eid, options = {})
       result == '1' ? true : false
     end
 
+    # Invite users to an event
+    # http://wiki.developers.facebook.com/index.php/Events.invite
+    # E.g:
+    # @session.event_invite('1000321123', %w{1234 4567 1000123321}, :personal_message => "Please come!")
+    def event_invite(eid, uids, options = {})
+      post('facebook.events.invite', options.merge(:eid => eid, :uids => uids))
+    end
+
     def event_members(eid)
       @members ||= {}
       @members[eid] ||= post('facebook.events.getMembers', :eid => eid) do |response|

test/facebooker/session_test.rb

@@ -218,6 +218,11 @@ def test_can_cancel_events
     assert @session.cancel_event("12345", :cancel_message => "It's raining")
   end
 
+  def test_can_invite_to_events
+    expect_http_posts_with_responses(example_event_invite_xml)
+    assert @session.event_invite("12345", %w{1234 4567 100043211234}, :personal_message => 'Please come!')
+  end
+
   def test_can_query_for_events
     expect_http_posts_with_responses(example_events_get_xml)
     events = @session.events
@@ -520,6 +525,15 @@ def example_event_create_xml
     </events_create_response> 
     XML
   end
+
+  def example_event_invite_xml
+    <<-XML
+    <?xml version="1.0" encoding="UTF-8"?>
+    <events_invite_response xmlns="http://api.facebook.com/1.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://api.facebook.com/1.0/ http://api.facebook.com/1.0/facebook.xsd">
+      1
+    </events_invite_response>
+    XML
+  end
 
   def example_event_cancel_xml
     <<-XML