diff --git a/test/test_client_contact.py b/test/test_client_contact.py
new file mode 100644
index 0000000..ad360c7
--- /dev/null
+++ b/test/test_client_contact.py
@@ -0,0 +1,52 @@
+import pytest  # type: ignore
+from unittest.mock import patch
+from superfaktura.client_contacts import (
+    ClientContactModel,
+    ClientContact,
+    ClientException,
+)
+
+
+@pytest.fixture
+def client_contact():
+    with patch("superfaktura.client_contacts.ClientContact", return_value=None):
+        return ClientContact()
+
+
+def test_add_contact_success(client_contact):
+    client = ClientContactModel(
+        name="John Doe",
+    )
+
+    with patch("superfaktura.superfaktura_api.SuperFakturaAPI.post") as mock_post:
+        mock_post.return_value = {"error_message": "Client created"}
+        assert client_contact.add_contact(contact=client)
+
+
+def test_add_contact_failed(client_contact):
+    client = ClientContactModel(
+        name="John Doe",
+    )
+
+    with patch("superfaktura.superfaktura_api.SuperFakturaAPI.post") as mock_post:
+        mock_post.return_value = {"error_message": "Client creation failed"}
+        assert not client_contact.add_contact(contact=client)
+
+
+def test_list(client_contact):
+    with patch("superfaktura.superfaktura_api.SuperFakturaAPI.get") as mock_get:
+        mock_get.return_value = {"data": "test"}
+        assert client_contact.list() == {"data": "test"}
+
+
+def test_get_client_exists(client_contact):
+    with patch("superfaktura.superfaktura_api.SuperFakturaAPI.get") as mock_get:
+        mock_get.return_value = {"Client": {"name": "John Doe", "id": 1}}
+        assert client_contact.get_client(client_id=1).name == "John Doe"
+
+
+def test_get_client_not_exists(client_contact):
+    with patch("superfaktura.superfaktura_api.SuperFakturaAPI.get") as mock_get:
+        mock_get.return_value = {}
+        with pytest.raises(ClientException):
+            client_contact.get_client(client_id=1)