just add encoding header to all test files "# -*- coding: utf-8 -*-"

tests/__init__.py

@@ -0,0 +1 @@
+# -*- coding: utf-8 -*-

tests/conftest.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 """pytest configuration for the unit tests."""
 
 import os

tests/constants.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 """Constants for unit tests."""
 
 

tests/test_identity.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 """Identity unit tests."""
 import os
 

tests/test_message.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 """Message unit tests."""
 
 from . import constants

tests/test_pep.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 """Unit test for pEp package, not for subpackages or modules."""