add unit test

tests/test_imap.py

@@ -1,17 +1,22 @@
 #!/usr/bin/python
 # -*- coding: UTF-8 -*-
 
-import os
+import datetime
 import unittest
-
-from stacosys.core.imap import _to_utf8, _email_non_ascii_to_uft8
 from email.header import Header
 
+from stacosys.core import imap
+
 
 class ImapTestCase(unittest.TestCase):
 
     def test_utf8_decode(self):
         h = Header(s="Chez Darty vous avez re\udcc3\udca7u un nouvel aspirateur Vacuum gratuit jl8nz",
                    charset="unknown-8bit")
-        decoded = _email_non_ascii_to_uft8(h)
+        decoded = imap._email_non_ascii_to_uft8(h)
         self.assertEqual(decoded, "Chez Darty vous avez reçu un nouvel aspirateur Vacuum gratuit jl8nz")
+
+    def test_parse_date(self):
+        now = datetime.datetime.now()
+        self.assertGreaterEqual(imap._parse_date(None), now)
+        self.assertEqual(imap._parse_date("Wed, 8 Dec 2021 20:05:20 +0100"), datetime.datetime(2021, 12, 8, 20, 5, 20))