diff --git a/modoboa/core/forms.py b/modoboa/core/forms.py
index 8779ec0ac..719badc5a 100644
--- a/modoboa/core/forms.py
+++ b/modoboa/core/forms.py
@@ -12,6 +12,9 @@ from modoboa.lib import parameters
 
 
 class LoginForm(forms.Form):
+
+    """User login form."""
+
     username = forms.CharField(
         label=ugettext_lazy("Username"),
         widget=forms.TextInput(attrs={"class": "form-control"})
diff --git a/modoboa/core/tests.py b/modoboa/core/tests.py
index af5794290..23e8df7f2 100644
--- a/modoboa/core/tests.py
+++ b/modoboa/core/tests.py
@@ -6,6 +6,27 @@ from modoboa.lib.tests import ModoTestCase
 from . import factories
 
 
+class AuthenticationTestCase(ModoTestCase):
+
+    """Validate authentication scenarios."""
+
+    @classmethod
+    def setUpTestData(cls):
+        """Create test data."""
+        super(AuthenticationTestCase, cls).setUpTestData()
+        cls.account = factories.UserFactory(
+            username="user@test.com", groups=('SimpleUsers',)
+        )
+
+    def test_authentication(self):
+        """Validate simple case."""
+        self.clt.logout()
+        data = {"username": "user@test.com", "password": "toto"}
+        response = self.clt.post(reverse("core:login"), data)
+        self.assertEqual(response.status_code, 302)
+        self.assertTrue(response.url.endswith(reverse("core:user_index")))
+
+
 class ProfileTestCase(ModoTestCase):
 
     @classmethod