diff --git a/setup.cfg b/setup.cfg
index 36ee378..8aa0ef4 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -4,7 +4,7 @@ optimize = 1
 [sdist]
 formats = bztar,zip
 
-[pytest]
+[tool:pytest]
 norecursedirs = .git .hg .svn build dist
 
 [egg_info]
diff --git a/suds/version.py b/suds/version.py
index 2516680..84f3e50 100644
--- a/suds/version.py
+++ b/suds/version.py
@@ -22,5 +22,5 @@
 
 """
 
-__version__ = "0.6.3+affirm"
+__version__ = "0.6.4+affirm"
 __build__ = ""
diff --git a/suds/wsse.py b/suds/wsse.py
index 2a091d0..bca0cc2 100644
--- a/suds/wsse.py
+++ b/suds/wsse.py
@@ -139,9 +139,9 @@ def setnonce(self, text=None):
             s = []
             s.append(self.username)
             s.append(self.password)
-            s.append(Token.sysdate())
+            s.append(Token.sysdate().encode('utf-8'))
             m = md5()
-            m.update(':'.join(s))
+            m.update(b':'.join(s))
             self.nonce = m.hexdigest()
         else:
             self.nonce = text
diff --git a/tests/indirect_parametrize.py b/tests/indirect_parametrize.py
index 4c909c0..7e89fd8 100644
--- a/tests/indirect_parametrize.py
+++ b/tests/indirect_parametrize.py
@@ -112,6 +112,7 @@ def pytest_configure(config):
         "argument list and keyword argument dictionary) based on the received "
         "input data. For more detailed information see the "
         "indirect_parametrize pytest plugin implementation module.")
+    pytest.indirect_parametrize = indirect_parametrize_plugin()
 
 
 def pytest_generate_tests(metafunc):
@@ -125,6 +126,5 @@ def pytest_generate_tests(metafunc):
     metafunc.parametrize(*args, **kwargs)
 
 
-def pytest_namespace():
-    """pytest hook publishing references in the toplevel pytest namespace."""
-    return {'indirect_parametrize': indirect_parametrize}
+def indirect_parametrize_plugin():
+    return indirect_parametrize
diff --git a/tests/test_wsse.py b/tests/test_wsse.py
new file mode 100644
index 0000000..7f3059b
--- /dev/null
+++ b/tests/test_wsse.py
@@ -0,0 +1,49 @@
+# -*- coding: utf-8 -*-
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the (LGPL) GNU Lesser General Public License as
+# published by the Free Software Foundation; either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Library Lesser General Public License for more details at
+# ( http://www.gnu.org/licenses/lgpl.html ).
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+# written by: Jurko Gospodnetić ( jurko.gospodnetic@pke.hr )
+
+"""
+Implemented using the 'pytest' testing framework.
+"""
+
+if __name__ == "__main__":
+    import __init__
+    __init__.runUsingPyTest(globals())
+
+
+from suds.wsse import UsernameToken
+
+
+class TestUsernameToken:
+
+    username_token = None
+
+    def setup(self):
+        self.username_token = UsernameToken(
+            username=b"foouser",
+            password=b"barpasswd",
+        )
+
+    def test_setnonce_null(self):
+        self.setup()
+        self.username_token.setnonce()
+        assert self.username_token.nonce != None
+
+    def test_setnonce_text(self):
+        self.setup()
+        self.username_token.setnonce(b"affirm")
+        assert self.username_token.nonce == b"affirm"