--- acct_mgr/tests/register.py
+++ acct_mgr/tests/register.py
@@ -100,6 +100,7 @@ class BasicCheckTestCase(_BaseTestCase):
         _BaseTestCase.setUp(self)
         self.env = EnvironmentStub(
                 enable=['trac.*', 'acct_mgr.admin.*',
+                        'acct_mgr.db.sessionstore',
                         'acct_mgr.pwhash.HtDigestHashMethod'])
         self.env.path = tempfile.mkdtemp()
         self.env.config.set('account-manager', 'password_store',
@@ -200,7 +201,8 @@ class EmailCheckTestCase(_BaseTestCase):
     def test_verify_conf_changes(self):
         """Registration challenges with EmailVerificationModule enabled."""
         self.env = EnvironmentStub(
-                enable=['trac.*', 'acct_mgr.admin.*', 'acct_mgr.register.*'])
+                enable=['trac.*', 'acct_mgr.admin.*', 'acct_mgr.register.*',
+                        'acct_mgr.pwhash.HtDigestHashMethod'])
         self.env.path = tempfile.mkdtemp()
         set_user_attribute(self.env, 'admin', 'email', 'admin@foo.bar')