updated doc message to be consistent with other apis, used proper variables in tests

Author: ekjotmultani

packages/amplify_core/lib/src/types/storage/list_options.dart

@@ -28,7 +28,7 @@ class StorageListOptions
   /// {@macro amplify_core.storage.list_plugin_options}
   final StorageListPluginOptions? pluginOptions;
 
-  /// an optional bucket to specify which bucket to return the list for
+  /// Optionally specify which bucket to retrieve
   final StorageBucket? bucket;
 
   /// an optional bucket to specify which bucket to return the list for

packages/storage/amplify_storage_s3/example/integration_test/list_test.dart

@@ -33,16 +33,20 @@ void main() {
       );
       setUpAll(() async {
         await configure(amplifyEnvironments['main']!);
-        for (var i = 0; i < 4; i++) {
+        for (var pathIndex = 0;
+            pathIndex < uploadedPaths.length ~/ 2;
+            pathIndex++) {
           await Amplify.Storage.uploadData(
-            path: StoragePath.fromString(uploadedPaths[i]),
+            path: StoragePath.fromString(uploadedPaths[pathIndex]),
             data: StorageDataPayload.bytes('test content'.codeUnits),
             bucket: mainBucket,
           ).result;
         }
-        for (var i = 4; i < 8; i++) {
+        for (var pathIndex = uploadedPaths.length ~/ 2;
+            pathIndex < uploadedPaths.length;
+            pathIndex++) {
           await Amplify.Storage.uploadData(
-            path: StoragePath.fromString(uploadedPaths[i]),
+            path: StoragePath.fromString(uploadedPaths[pathIndex]),
             data: StorageDataPayload.bytes('test content'.codeUnits),
             bucket: secondaryBucket,
           ).result;
@@ -64,17 +68,21 @@ void main() {
               bucket: secondaryBucket,
             ),
           ).result;
-          for (var i = 0; i < 4; i++) {
+          for (var pathIndex = 0;
+              pathIndex < uploadedPaths.length ~/ 2;
+              pathIndex++) {
             expect(
               listResultMainBucket.items
-                  .any((item) => item.path == uploadedPaths[i]),
+                  .any((item) => item.path == uploadedPaths[pathIndex]),
               isTrue,
             );
           }
-          for (var i = 4; i < 8; i++) {
+          for (var pathIndex = uploadedPaths.length ~/ 2;
+              pathIndex < uploadedPaths.length;
+              pathIndex++) {
             expect(
               listResultSecondaryBucket.items
-                  .any((item) => item.path == uploadedPaths[i]),
+                  .any((item) => item.path == uploadedPaths[pathIndex]),
               isTrue,
             );
           }