diff --git a/acceptancetests/jujupy/client.py b/acceptancetests/jujupy/client.py
index <HASH>..<HASH> 100644
--- a/acceptancetests/jujupy/client.py
+++ b/acceptancetests/jujupy/client.py
@@ -1605,8 +1605,7 @@ class ModelClient:
 
     Note: A model is often called an enviroment (Juju 1 legacy).
 
-    This class represents the latest Juju version.  Subclasses are used to
-    support older versions (see get_client_class).
+    This class represents the latest Juju version.
     """
 
     # The environments.yaml options that are replaced by bootstrap options.
diff --git a/acceptancetests/jujupy/tests/test_client.py b/acceptancetests/jujupy/tests/test_client.py
index <HASH>..<HASH> 100644
--- a/acceptancetests/jujupy/tests/test_client.py
+++ b/acceptancetests/jujupy/tests/test_client.py
@@ -291,7 +291,7 @@ class TestJuju2Backend(TestCase):
                                soft_deadline=None)
         with patch('subprocess.Popen') as mock_popen:
             mock_popen.return_value.communicate.return_value = (
-                '{"current-model": "model"}', '')
+                b'{"current-model": "model"}', b'')
             mock_popen.return_value.returncode = 0
             result = backend.get_active_model('/foo/bar')
         self.assertEqual(('model'), result)
Clarify testing with py3