Add test coverage for Surveys

Author: AliAbdelfattah

lib/Surveys.dart

@@ -1,9 +1,9 @@
 // ignore_for_file: avoid_classes_with_only_static_members
 
 import 'dart:async';
-import 'dart:io' show Platform;
 
 import 'package:flutter/services.dart';
+import 'package:instabug_flutter/utils/platform_manager.dart';
 
 class Surveys {
   static Function? _onShowCallback;
@@ -131,7 +131,7 @@ class Surveys {
   /// NPS Surveys or AppRating Surveys to AppStore to let users rate your app on AppStore itself.
   /// [appStoreURL] A String url for the published iOS app on AppStore
   static Future<void> setAppStoreURL(String appStoreURL) async {
-    if (Platform.isIOS) {
+    if (PlatformManager.instance.isIOS()) {
       final List<dynamic> params = <dynamic>[appStoreURL];
       await _channel.invokeMethod<Object>('setAppStoreURL:', params);
     }

test/instabug_flutter_test.dart

@@ -704,6 +704,21 @@ void main() {
     ]);
   });
 
+  test('setAppStoreURL Test', () async {
+    const appStoreURL = 'appStoreURL';
+    final List<dynamic> args = <dynamic>[appStoreURL];
+
+    when(mockPlatform.isIOS()).thenAnswer((_) => true);
+
+    Surveys.setAppStoreURL(appStoreURL);
+    expect(log, <Matcher>[
+      isMethodCall(
+        'setAppStoreURL:',
+        arguments: args,
+      )
+    ]);
+  });
+
   test('showFeatureRequests Test', () async {
     FeatureRequests.show();
     expect(