feat: implement linting and testing

tests/test_resources.py

@@ -0,0 +1,88 @@
+"""Tests for data_platform.resources."""
+
+from unittest.mock import MagicMock, patch
+
+from data_platform.resources import FundaResource, PostgresResource
+
+# ── FundaResource ─────────────────────────────────────────────────────────────
+
+
+class TestFundaResource:
+    def test_get_client_returns_funda_instance(self):
+        resource = FundaResource(timeout=10)
+        from funda import Funda
+
+        client = resource.get_client()
+        assert isinstance(client, Funda)
+
+    def test_default_timeout(self):
+        resource = FundaResource()
+        assert resource.timeout == 30
+
+    def test_custom_timeout(self):
+        resource = FundaResource(timeout=60)
+        assert resource.timeout == 60
+
+
+# ── PostgresResource ──────────────────────────────────────────────────────────
+
+
+class TestPostgresResource:
+    def _make_resource(self, **kwargs):
+        defaults = {
+            "host": "testhost",
+            "port": 5432,
+            "user": "user",
+            "password": "pw",
+            "dbname": "db",
+        }
+        return PostgresResource(**{**defaults, **kwargs})
+
+    def test_connection_url_format(self):
+        res = self._make_resource()
+        # Patch at the module level so the frozen instance isn't mutated
+        with patch("data_platform.resources.create_engine") as mock_create:
+            mock_create.return_value = MagicMock()
+            res.get_engine()
+            call_url = mock_create.call_args[0][0]
+            assert "testhost" in call_url
+            assert "5432" in call_url
+            assert "user" in call_url
+            assert "pw" in call_url
+            assert "db" in call_url
+
+    def test_connection_url_scheme(self):
+        res = self._make_resource()
+        with patch("data_platform.resources.create_engine") as mock_create:
+            mock_create.return_value = MagicMock()
+            res.get_engine()
+            call_url = mock_create.call_args[0][0]
+            assert call_url.startswith("postgresql://")
+
+    def test_execute_calls_engine_begin(self):
+        """execute() wraps its statement in engine.begin()."""
+        mock_engine = MagicMock()
+        mock_conn = MagicMock()
+        mock_engine.begin.return_value.__enter__ = MagicMock(return_value=mock_conn)
+        mock_engine.begin.return_value.__exit__ = MagicMock(return_value=False)
+
+        # Patch create_engine at module level so that get_engine() returns our mock
+        with patch("data_platform.resources.create_engine", return_value=mock_engine):
+            res = self._make_resource()
+            res.execute("SELECT 1")
+
+        mock_conn.execute.assert_called_once()
+
+    def test_execute_many_calls_engine_begin(self):
+        """execute_many() wraps its statement in engine.begin()."""
+        mock_engine = MagicMock()
+        mock_conn = MagicMock()
+        mock_engine.begin.return_value.__enter__ = MagicMock(return_value=mock_conn)
+        mock_engine.begin.return_value.__exit__ = MagicMock(return_value=False)
+
+        with patch("data_platform.resources.create_engine", return_value=mock_engine):
+            res = self._make_resource()
+            rows = [{"id": 1}, {"id": 2}]
+            res.execute_many("INSERT INTO t VALUES (:id)", rows)
+
+        mock_conn.execute.assert_called_once()