diff --git a/test/test_helper.rb b/test/test_helper.rb
index b14e886..4b5388d 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -152,6 +152,14 @@ module TestDatabase
     assert_equal expected, User.group_by_day(:created_at).group_by_year(:created_at).count
   end
 
+  def test_groupdate_multiple_hour_of_day_day_of_week
+    create_user "2013-05-01 00:00:00 UTC", 1
+    expected = {
+      [0, 3] => 1
+    }
+    assert_equal expected, User.group_by_hour_of_day(:created_at).group_by_day_of_week(:created_at).count
+  end
+
   def test_not_modified
     create_user "2013-05-01 00:00:00 UTC"
     expected = {utc.parse("2013-05-01 00:00:00 UTC") => 1}
--
libgit2 0.21.0