diff --git a/tests/utils/test_session_limiter.py b/tests/utils/test_session_limiter.py
new file mode 100644
index 00000000..50d0ba54
--- /dev/null
+++ b/tests/utils/test_session_limiter.py
@@ -0,0 +1,51 @@
+import pytest
+from redis import Redis
+from unittest.mock import Mock
+from uuid import uuid4
+
+from atst.utils.session_limiter import SessionLimiter
+from tests.factories import UserFactory
+from atst.models.user import User
+
+
+@pytest.fixture
+def mock_redis():
+    return Mock(spec=Redis)
+
+
+@pytest.fixture
+def mock_session():
+    mock = Mock(spec=["sid"])
+    mock.sid = uuid4()
+    return mock
+
+
+def test_session_limiter_deletes_users_old_session(mock_redis, mock_session):
+    last_session_id = uuid4()
+    current_session_id = uuid4()
+
+    mock_session.sid = current_session_id
+
+    session_limiter = SessionLimiter(
+        {"LIMIT_CONCURRENT_SESSIONS": True}, mock_session, mock_redis
+    )
+    user = UserFactory.create(last_session_id=last_session_id)
+    session_limiter.on_login(user)
+
+    mock_redis.delete.assert_called_with("session:{}".format(last_session_id))
+
+
+def test_session_limiter_updates_users_last_sesion_id(mock_redis, mock_session, db):
+    last_session_id = uuid4()
+    current_session_id = uuid4()
+
+    mock_session.sid = current_session_id
+
+    session_limiter = SessionLimiter(
+        {"LIMIT_CONCURRENT_SESSIONS": True}, mock_session, mock_redis
+    )
+    user = UserFactory.create(last_session_id=last_session_id)
+    session_limiter.on_login(user)
+
+    user = db.query(User).get(user.id)
+    assert user.last_session_id == last_session_id