Fix #130 - Fix on Tests.

   . Move session tests from test_models to test_session.
   . Re-write valid/unvalid IP Address session tests.

ban/tests/auth/test_models.py

@@ -1,7 +1,5 @@
-import pytest
-
 from ban.auth import models
-from ban.tests.factories import UserFactory, ClientFactory
+from ban.tests.factories import UserFactory
 
 
 def test_user_password_is_hashed():
@@ -12,30 +10,3 @@ def test_user_password_is_hashed():
     user = models.User.get(models.User.id == user.id)
     assert user.password != password
     assert user.check_password(password)
-
-
-def test_session_can_be_created_with_a_user():
-    user = UserFactory()
-    session = models.Session.create(user=user)
-    assert session.user == user
-    assert session.as_relation == {
-        'id': session.pk,
-        'user': user.username,
-        'client': None
-    }
-
-
-def test_session_can_be_created_with_a_client():
-    client = ClientFactory()
-    session = models.Session.create(client=client)
-    assert session.client == client
-    assert session.as_relation == {
-        'id': session.pk,
-        'user': None,
-        'client': client.name
-    }
-
-
-def test_session_should_have_either_a_client_or_a_user():
-    with pytest.raises(ValueError):
-        models.Session.create()