Add test case for truncate_datetime

Author: 3schwartz

tests/test_diff_datetime.py

@@ -22,6 +22,9 @@ def test_datetime_within_array_with_timezone_diff(self):
         res_ignore = DeepDiff(d1, d2, ignore_order=True)
         assert res_ignore == expected
 
+        res_truncate = DeepDiff(d1, d2, truncate_datetime='second')
+        assert res_truncate == {}
+
 
     def test_datetime_diff(self):
         """Testing for the correct setting and usage of epsilon."""