1 files changed, 10 insertions, 0 deletions
diff --git a/activerecord/test/cases/migration/index_test.rb b/activerecord/test/cases/migration/index_test.rb
index bfa275fee2..0787414d8f 100644
--- a/activerecord/test/cases/migration/index_test.rb
+++ b/activerecord/test/cases/migration/index_test.rb
@@ -97,6 +97,16 @@ module ActiveRecord
         end
       end
 
+      def test_deprecated_type_argument
+        message = "Passing a string as third argument of `add_index` is deprecated and will" +
+          " be removed in Rails 4.1." +
+          " Use add_index(:testings, [:foo, :bar], unique: true) instead"
+
+        assert_deprecated message do
+          connection.add_index :testings, [:foo, :bar], "UNIQUE"
+        end
+      end
+
       def test_unique_index_exists
         connection.add_index :testings, :foo, :unique => true