Add failing test for unicode string encryption

Author: doc-hex

tests/unit/test_secret.py

@@ -20,3 +20,23 @@ def test_secret(self):
         clear3 = box.decrypt(ctxt2)
         self.assertEqual(clear3, msg)
 
+    def test_unicode_issues(self):
+        msg = u'Unicode string'
+        box = libnacl.secret.SecretBox()
+
+        # Encrypting a unicode string (in py2) should
+        # probable assert, but instead it encryptes zeros,
+        # perhaps the high bytes in UCS-16?
+        ctxt = box.encrypt(msg)
+        self.assertNotEqual(msg, ctxt)
+
+        box2 = libnacl.secret.SecretBox(box.sk)
+        clear1 = box.decrypt(ctxt)
+
+        self.assertEqual(msg, clear1)
+        clear2 = box2.decrypt(ctxt)
+
+        self.assertEqual(clear1, clear2)
+        ctxt2 = box2.encrypt(msg)
+        clear3 = box.decrypt(ctxt2)
+        self.assertEqual(clear3, msg)