1 files changed, 9 insertions, 0 deletions
diff --git a/test/psych/test_date_time.rb b/test/psych/test_date_time.rb
index 91de6a4841..72150ad7db 100644
--- a/test/psych/test_date_time.rb
+++ b/test/psych/test_date_time.rb
@@ -3,6 +3,15 @@ require 'date'
 
 module Psych
   class TestDateTime < TestCase
+    def test_negative_year
+      time = Time.utc -1, 12, 16
+      assert_cycle time
+    end
+
+    def test_new_datetime
+      assert_cycle DateTime.new
+    end
+
     def test_invalid_date
       assert_cycle "2013-10-31T10:40:07-000000000000033"
     end