[in_app_purchase_storekit] fix price displayed with wrong precision (#8127)

Fixes flutter/flutter#159080

Author: LouiseHsu

packages/in_app_purchase/in_app_purchase_storekit/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.3.20+2
+
+* Fixes price not being displayed correctly.
+
 ## 0.3.20+1
 
 * Prevent devices below iOS 15 or macOS 15 from enabling StoreKit2.

packages/in_app_purchase/in_app_purchase_storekit/lib/src/types/app_store_product_details.dart

@@ -66,7 +66,7 @@ class AppStoreProduct2Details extends ProductDetails {
       id: product.id,
       title: product.displayName,
       description: product.description,
-      price: product.priceLocale.currencySymbol + product.price.toString(),
+      price: product.displayPrice,
       rawPrice: product.price,
       currencyCode: product.priceLocale.currencyCode,
       currencySymbol: product.priceLocale.currencySymbol,

packages/in_app_purchase/in_app_purchase_storekit/pubspec.yaml

@@ -2,7 +2,7 @@ name: in_app_purchase_storekit
 description: An implementation for the iOS and macOS platforms of the Flutter `in_app_purchase` plugin. This uses the StoreKit Framework.
 repository: https://github.com/flutter/packages/tree/main/packages/in_app_purchase/in_app_purchase_storekit
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+in_app_purchase%22
-version: 0.3.20+1
+version: 0.3.20+2
 
 environment:
   sdk: ^3.3.0

packages/in_app_purchase/in_app_purchase_storekit/test/store_kit_wrappers/pigeon_converter_test.dart

@@ -1,9 +1,10 @@
 // Copyright 2013 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
 import 'package:flutter_test/flutter_test.dart';
+import 'package:in_app_purchase_storekit/in_app_purchase_storekit.dart';
 import 'package:in_app_purchase_storekit/src/messages.g.dart';
+import 'package:in_app_purchase_storekit/src/store_kit_2_wrappers/sk2_product_wrapper.dart';
 import 'package:in_app_purchase_storekit/store_kit_wrappers.dart';
 
 void main() {
@@ -104,4 +105,24 @@ void main() {
     expect(wrapper.domain, 'domain');
     expect(wrapper.userInfo, <String, Object>{});
   });
+
+  test('test AppStoreProduct2Details conversion', () {
+    final SK2Product product = SK2Product(
+        id: '123',
+        displayName: 'name',
+        displayPrice: '0.99',
+        description: 'description',
+        price: 9.99,
+        type: SK2ProductType.consumable,
+        priceLocale: SK2PriceLocale(currencyCode: 'USD', currencySymbol: r'$'));
+
+    final AppStoreProduct2Details details =
+        AppStoreProduct2Details.fromSK2Product(product);
+
+    expect(details.sk2Product, product);
+    expect(details.price, product.displayPrice);
+    expect(details.id, product.id);
+    expect(details.description, product.description);
+    expect(details.currencySymbol, product.priceLocale.currencySymbol);
+  });
 }