feat: annotate scaled ingredient quantities

Refs #1, #2

test/recipe-scaler.test.js

@@ -1,6 +1,6 @@
 const test = require("node:test");
 const assert = require("node:assert/strict");
-const { parseYield, scaleIngredient, scaleRecipe } = require("../lib/recipe-scaler");
+const { parseYield, scaleIngredient, scaleIngredientWithStatus, scaleRecipe } = require("../lib/recipe-scaler");
 
 test("extracts the number of portions from a recipe yield", () => {
   assert.equal(parseYield("6 servings"), 6);
@@ -25,4 +25,21 @@ test("returns a scaled copy of a recipe", () => {
   assert.equal(scaled.recipeYield, "9 servings");
   assert.deepEqual(scaled.recipeIngredient, ["3 cups oats", "Salt to taste"]);
   assert.equal(original.recipeYield, "6 servings");
+  assert.equal(scaled.originalRecipeYield, "6 servings");
+  assert.deepEqual(scaled.recipeIngredientStatus, ["scaled", "unquantified"]);
+});
+
+test("reports ingredient scaling confidence", () => {
+  assert.deepEqual(scaleIngredientWithStatus("2 cups oats", 1.5), {
+    value: "3 cups oats", status: "scaled"
+  });
+  assert.deepEqual(scaleIngredientWithStatus("Salt to taste", 2), {
+    value: "Salt to taste", status: "unquantified"
+  });
+  assert.deepEqual(scaleIngredientWithStatus("1-2 tbsp oil", 2), {
+    value: "1-2 tbsp oil", status: "unscalable"
+  });
+  assert.deepEqual(scaleIngredientWithStatus("1 cup milk", 0.7), {
+    value: "0.7 cup milk", status: "approximate"
+  });
 });