feat(meals): suggest complementary sides

backend/tests/test_meal_pairings.py

@@ -0,0 +1,56 @@
+from types import SimpleNamespace
+
+from app.models import MealType
+from app.services.meal_pairings import components_with_suggested_sides, suggest_sides_for_recipe
+
+
+def _recipe(**kwargs):
+    defaults = {
+        "name": "Grilled Chicken Breast",
+        "protein_type": "chicken",
+        "cuisine_tags": [],
+        "ingredients": [],
+        "side_dishes": [],
+    }
+    defaults.update(kwargs)
+    return SimpleNamespace(**defaults)
+
+
+def test_simple_protein_gets_vegetable_and_carb_pairing():
+    sides = suggest_sides_for_recipe(_recipe(), MealType.DINNER)
+
+    assert sides is not None
+    assert sides["vegetable"] == "roasted broccoli"
+    assert sides["carb"] == "rice pilaf or roasted potatoes"
+
+
+def test_complete_meal_does_not_get_extra_pairing():
+    recipe = _recipe(name="Chicken Pasta Bake", protein_type="chicken")
+
+    assert suggest_sides_for_recipe(recipe, MealType.DINNER) is None
+
+
+def test_breakfast_does_not_get_side_pairing():
+    recipe = _recipe(name="Turkey Sausage", protein_type="turkey")
+
+    assert suggest_sides_for_recipe(recipe, MealType.BREAKFAST) is None
+
+
+def test_recipe_side_dishes_are_used_when_present():
+    recipe = _recipe(side_dishes=[{"name": "green salad"}, {"name": "garlic bread"}])
+
+    sides = suggest_sides_for_recipe(recipe, "dinner")
+
+    assert sides is not None
+    assert sides["items"] == ["green salad", "garlic bread"]
+
+
+def test_components_preserve_existing_scores():
+    components = components_with_suggested_sides(
+        _recipe(),
+        MealType.DINNER,
+        {"savings": 0.25},
+    )
+
+    assert components["savings"] == 0.25
+    assert components["suggested_sides"]["needed"] is True