fix: coerce numeric nutrition values to strings in Cookbook model (fixes #708)

Agent-Logs-Url: https://github.com/dylanlangston/nextcloud-mcp-server/sessions/d7163bb6-ad5d-4406-8d11-145c5317ec19

Co-authored-by: dylanlangston <16236219+dylanlangston@users.noreply.github.com>

tests/unit/test_nutrition_model.py

@@ -0,0 +1,77 @@
+"""Unit tests for Nutrition model numeric coercion (issue #708)."""
+
+import pytest
+
+from nextcloud_mcp_server.models.cookbook import Nutrition
+
+
+@pytest.mark.unit
+def test_nutrition_calories_accepts_string():
+    """String calories values should be accepted as-is."""
+    n = Nutrition(calories="650 kcal")
+    assert n.calories == "650 kcal"
+
+
+@pytest.mark.unit
+def test_nutrition_calories_coerces_int():
+    """Integer calories values should be coerced to strings."""
+    n = Nutrition(calories=260)
+    assert n.calories == "260"
+
+
+@pytest.mark.unit
+def test_nutrition_calories_coerces_float():
+    """Float calories values should be coerced to strings."""
+    n = Nutrition(calories=260.5)
+    assert n.calories == "260.5"
+
+
+@pytest.mark.unit
+def test_nutrition_calories_accepts_none():
+    """None calories should remain None."""
+    n = Nutrition(calories=None)
+    assert n.calories is None
+
+
+@pytest.mark.unit
+def test_nutrition_all_fields_coerce_int():
+    """All nutrition content fields should coerce integer values to strings."""
+    n = Nutrition(
+        calories=260,
+        carbohydrateContent=30,
+        cholesterolContent=10,
+        fatContent=15,
+        fiberContent=5,
+        proteinContent=20,
+        saturatedFatContent=3,
+        servingSize=1,
+        sodiumContent=500,
+        sugarContent=8,
+        transFatContent=0,
+        unsaturatedFatContent=12,
+    )
+    assert n.calories == "260"
+    assert n.carbohydrateContent == "30"
+    assert n.cholesterolContent == "10"
+    assert n.fatContent == "15"
+    assert n.fiberContent == "5"
+    assert n.proteinContent == "20"
+    assert n.saturatedFatContent == "3"
+    assert n.servingSize == "1"
+    assert n.sodiumContent == "500"
+    assert n.sugarContent == "8"
+    assert n.transFatContent == "0"
+    assert n.unsaturatedFatContent == "12"
+
+
+@pytest.mark.unit
+def test_nutrition_mixed_types():
+    """Nutrition model should handle a mix of string, int, and None values."""
+    n = Nutrition(
+        calories="650 kcal",
+        proteinContent=18,
+        fatContent=None,
+    )
+    assert n.calories == "650 kcal"
+    assert n.proteinContent == "18"
+    assert n.fatContent is None