Allow issue grouping by custom field (#2679).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3071 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/query_test.rb

@@ -197,6 +197,11 @@ class QueryTest < ActiveSupport::TestCase
     assert q.has_column?(c)
   end
   
+  def test_groupable_columns_should_include_custom_fields
+    q = Query.new
+    assert q.groupable_columns.detect {|c| c.is_a? QueryCustomFieldColumn}
+  end
+  
   def test_default_sort
     q = Query.new
     assert_equal [], q.sort_criteria