feat(grid): fetch_grid_page datasource server-side AG Grid (#41)

tests/test_grid.py

@@ -0,0 +1,24 @@
+from src.utils.grid import fetch_grid_page
+
+
+def test_fetch_grid_page_returns_rows_and_count():
+    rows, total = fetch_grid_page(None, None, 0, 20)
+    assert isinstance(rows, list)
+    assert isinstance(total, int)
+    assert total >= len(rows)
+    if rows:
+        # postprocess_page ajoute une colonne 'marche' avec un lien
+        assert "marche" in rows[0]
+
+
+def test_fetch_grid_page_filter_reduces_count():
+    _, total_all = fetch_grid_page(None, None, 0, 1)
+    fm = {"objet": {"filterType": "text", "type": "contains", "filter": "zzzzzznope"}}
+    rows, total_filtered = fetch_grid_page(fm, None, 0, 20)
+    assert total_filtered <= total_all
+    assert rows == [] and total_filtered == 0
+
+
+def test_fetch_grid_page_offset_slicing():
+    rows, _ = fetch_grid_page(None, None, 0, 5)
+    assert len(rows) <= 5