feat: add RecipeCreate/Update/Read schemas with canonical ingredient refs

backend/tests/test_recipe_schema.py

@@ -0,0 +1,41 @@
+from uuid import uuid4
+
+import pytest
+from pydantic import ValidationError
+
+from app.schemas.recipe import RecipeCreate, RecipeIngredientRef, ResolveIngredientRequest
+
+
+def test_recipe_create_requires_canonical_ingredient_ids() -> None:
+    iid = uuid4()
+    payload = RecipeCreate(
+        name="Sheet-Pan Chicken Thighs",
+        servings=4,
+        prep_time_minutes=10,
+        cook_time_minutes=30,
+        cuisine_tags=["american"],
+        protein_type="chicken",
+        ingredients=[RecipeIngredientRef(ingredient_id=iid, qty=2.0, unit="lb")],
+        instructions=["Preheat oven", "Roast"],
+    )
+    assert payload.ingredients[0].ingredient_id == iid
+    assert payload.servings == 4
+
+
+def test_recipe_create_rejects_empty_ingredients() -> None:
+    with pytest.raises(ValidationError):
+        RecipeCreate(
+            name="Empty",
+            servings=4,
+            prep_time_minutes=5,
+            cook_time_minutes=5,
+            cuisine_tags=[],
+            protein_type="vegetarian",
+            ingredients=[],
+            instructions=["nope"],
+        )
+
+
+def test_resolve_ingredient_request_round_trip() -> None:
+    req = ResolveIngredientRequest(text="1 lb chicken thighs")
+    assert req.text == "1 lb chicken thighs"