Final commit, I've learned my lesson

dkim/__init__.py

@@ -301,6 +301,7 @@ def validate_signature_fields(sig, mandatory_fields=[b'v', b'a', b'b', b'bh', b'
     if b'cv' in sig and sig[b'cv'] not in (CV_Pass, CV_Fail, CV_None):
         raise ValidationError("cv= value is not valid (%s)" % sig[b'cv'])
 
+    # Somehow convert it to UTF8 before going to this?
     # Limit domain validation to ASCII domains because too hard
     try:
         str(sig[b'd'], 'ascii')
@@ -311,6 +312,7 @@ def validate_signature_fields(sig, mandatory_fields=[b'v', b'a', b'b', b'bh', b'
         # Not an ASCII domain
         pass
 
+
     # Nasty hack to support both str and bytes... check for both the
     # character and integer values.
     if not arc and b'i' in sig and (

dkim/__main__.py

@@ -1,7 +1,7 @@
 import unittest
 import doctest
 import dkim
-from tests import test_suite
+from dkim.tests import test_suite
 
 doctest.testmod(dkim)
 unittest.TextTestRunner().run(test_suite())