fix: addon free_threshold calculation fixed

src/lib/format.test.ts

@@ -14,8 +14,8 @@ import type { AddonData, PricingPlans } from '../types';
 const pricing: PricingPlans = {
   device_price: 100,
   addons: [
-    { id: 'a', name: 'A', price: 50, free_threshold: 0 },
-    { id: 'b', name: 'B', price: 30, free_threshold: 0 },
+    { id: 'a', name: 'A', price: 50, free_threshold: -1 },
+    { id: 'b', name: 'B', price: 30, free_threshold: -1 },
   ],
 };
 
@@ -30,10 +30,20 @@ describe('round2', () => {
 describe('sumAddonPrices', () => {
   const addons: AddonData[] = pricing.addons;
   it('sums selected addon prices', () => {
-    expect(sumAddonPrices(addons, ['a', 'b'])).toBe(80);
-    expect(sumAddonPrices(addons, ['a'])).toBe(50);
-    expect(sumAddonPrices(addons, ['unknown'])).toBe(0);
-    expect(sumAddonPrices(addons, [])).toBe(0);
+    expect(sumAddonPrices(addons, ['a', 'b'], 6)).toBe(80);
+    expect(sumAddonPrices(addons, ['a'], 6)).toBe(50);
+    expect(sumAddonPrices(addons, ['unknown'], 6)).toBe(0);
+    expect(sumAddonPrices(addons, [], 6)).toBe(0);
+  });
+
+  it('makes addons free at their device threshold but keeps -1 paid', () => {
+    const thresholdAddons: AddonData[] = [
+      { id: 'threshold', name: 'Threshold', price: 50, free_threshold: 6 },
+      { id: 'paid', name: 'Paid', price: 30, free_threshold: -1 },
+    ];
+
+    expect(sumAddonPrices(thresholdAddons, ['threshold', 'paid'], 5)).toBe(80);
+    expect(sumAddonPrices(thresholdAddons, ['threshold', 'paid'], 6)).toBe(30);
   });
 });