diff --git a/test_planka_logic.py b/test_planka_logic.py
new file mode 100644
index 0000000..7948f1d
--- /dev/null
+++ b/test_planka_logic.py
@@ -0,0 +1,62 @@
+import pytest
+from unittest.mock import MagicMock, patch
+from server import PlankaClient
+
+@pytest.fixture
+def client():
+    return PlankaClient("https://planka.test", "fake-token")
+
+def test_get_projects_nested(client):
+    mock_response = {
+        "items": [
+            {"id": "1", "name": "Project 1"},
+            {"id": "2", "name": "Project 2"}
+        ]
+    }
+    with patch("requests.get") as mock_get:
+        mock_get.return_value.json.return_value = mock_response
+        mock_get.return_value.status_code = 200
+        
+        projects = client.get_projects()
+        assert len(projects) == 2
+        assert projects[0]["name"] == "Project 1"
+
+def test_get_boards_included(client):
+    # Test the 'included' structure we saw in the real API
+    mock_response = {
+        "included": {
+            "boards": [
+                {"id": "b1", "name": "Board 1"}
+            ]
+        }
+    }
+    with patch("requests.get") as mock_get:
+        mock_get.return_value.json.return_value = mock_response
+        mock_get.return_value.status_code = 200
+        
+        boards = client.get_boards("p1")
+        assert len(boards) == 1
+        assert boards[0]["name"] == "Board 1"
+
+def test_get_boards_empty(client):
+    mock_response = {"item": {"id": "p1"}, "included": {}}
+    with patch("requests.get") as mock_get:
+        mock_get.return_value.json.return_value = mock_response
+        mock_get.return_value.status_code = 200
+        
+        boards = client.get_boards("p1")
+        assert boards == []
+
+def test_get_cards_nested(client):
+    mock_response = {
+        "items": [
+            {"id": "c1", "name": "Card 1"}
+        ]
+    }
+    with patch("requests.get") as mock_get:
+        mock_get.return_value.json.return_value = mock_response
+        mock_get.return_value.status_code = 200
+        
+        cards = client.get_cards("b1")
+        assert len(cards) == 1
+        assert cards[0]["name"] == "Card 1"