gistfile1.diff

diff --git a/test/unit/common/test_utils.py b/test/unit/common/test_utils.py
index 18a12d8..4d874c4 100644
--- a/test/unit/common/test_utils.py
+++ b/test/unit/common/test_utils.py
@@ -228,6 +228,29 @@ class TestTimestamp(unittest.TestCase):
         )
         for value in test_values:
             self.assertEqual(utils.Timestamp(value).isoformat, expected)
+        expected = '1970-01-01T00:00:00.000000'
+        test_values = (
+            '0',
+            '0000000000.00000',
+            '0000000000.00000_ffffffffffff',
+            0,
+            0.0,
+        )
+        for value in test_values:
+            self.assertEqual(utils.Timestamp(value).isoformat, expected)
+
+    def test_not_equal(self):
+        ts = '1402436408.91203_0000000000000001'
+        test_values = (
+            utils.Timestamp('1402436408.91203_0000000000000002'),
+            utils.Timestamp('1402436408.91203'),
+            utils.Timestamp(1402436408.91203),
+            utils.Timestamp(1402436408.91204),
+            utils.Timestamp(1402436408.91203, offset=0),
+            utils.Timestamp(1402436408.91203, offset=2),
+        )
+        for value in test_values:
+            self.assertTrue(value != ts)
 
     def test_no_force_internal_no_offset(self):
         """Test that internal is the same as normal with no offset"""