chore(web_file_system): sync changes from open_xml including idb_block_store, getAsBlob, and tests

experimental/web_file_system/test/cleanup_troubleshoot_test.dart

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+@TestOn('browser')
+import 'dart:convert';
+import 'package:test/test.dart';
+import 'package:web_file_system/web_file_system.dart';
+
+void main() {
+  late WebFileSystem fs;
+
+  setUp(() async {
+    // Tests run in parallel in browser often sharing context, so use unique paths.
+    fs = WebFileSystem();
+  });
+
+  group('Troubleshooting NotFoundError', () {
+    test('Temp directory creation and persistence', () async {
+      print('DEBUG: creating temp dir');
+      final tempDir = await fs.systemTempDirectory.createTemp('debug_test_');
+      print('DEBUG: Created temp dir at ${tempDir.path}');
+
+      expect(await tempDir.exists(), isTrue);
+
+      final file = tempDir.childFile('test.txt');
+      await file.writeAsString('Persistence Check');
+
+      print('DEBUG: checking existence immediately');
+      expect(await file.exists(), isTrue);
+      expect(await file.readAsString(), equals('Persistence Check'));
+
+      // Wait a bit to simulate pipeline delays
+      await Future.delayed(const Duration(milliseconds: 500));
+
+      print('DEBUG: checking existence after delay');
+      expect(await file.readAsString(), equals('Persistence Check'));
+
+      // Cleanup
+      await tempDir.delete(recursive: true);
+      print('DEBUG: deleted temp dir');
+      expect(await file.exists(), isFalse);
+    });
+
+    test('Deep copy behavior verification', () async {
+      final srcDir = await fs.systemTempDirectory.createTemp('src_');
+      final destDir = await fs.systemTempDirectory.createTemp('dest_');
+
+      final srcFile = srcDir.childFile('source.dat');
+      // Write some substantial data
+      final data = utf8.encode('Essential Data for Export');
+      await srcFile.writeAsBytes(data);
+
+      print('DEBUG: Source file written to ${srcFile.path}');
+
+      final destPath = destDir.childFile('copy.dat').path;
+      print('DEBUG: Copying to $destPath');
+
+      final copiedFile = await srcFile.copy(destPath);
+
+      print('DEBUG: Copy complete');
+      expect(await copiedFile.exists(), isTrue);
+      expect(await copiedFile.readAsBytes(), equals(data));
+
+      // Now delete source
+      print('DEBUG: Deleting source file');
+      await srcFile.delete();
+      expect(await srcFile.exists(), isFalse);
+
+      // Verify copy still exists and is readable (Deep Copy Check)
+      print('DEBUG: Verifying copy after source deletion');
+      expect(await copiedFile.exists(), isTrue);
+      try {
+        final copyData = await copiedFile.readAsBytes();
+        expect(copyData, equals(data));
+        print('DEBUG: Deep copy verified!');
+      } catch (e) {
+        print('ERROR: Deep copy failed! Reading copy caused error: $e');
+        rethrow;
+      }
+    });
+
+    test('Concurrent Write/Read stress', () async {
+      final dir = await fs.systemTempDirectory.createTemp('stress_');
+      final file = dir.childFile('stress.txt');
+
+      // Write
+      await file.writeAsString('Initial');
+
+      // Rapidly update
+      for (int i = 0; i < 10; i++) {
+        await file.writeAsString('Update $i');
+        final content = await file.readAsString();
+        expect(content, equals('Update $i'));
+      }
+    });
+  });
+}

experimental/web_file_system/test/robust_correctness_test.dart

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+@TestOn('browser')
+import 'dart:async';
+import 'dart:typed_data';
+import 'package:test/test.dart';
+import 'package:web_file_system/web_file_system.dart';
+
+void main() {
+  late WebFileSystem fs;
+
+  setUp(() async {
+    fs = WebFileSystem();
+  });
+
+  group('Robust Correctness Tests', () {
+    test('Multiple files in a directory stress test', () async {
+      final uniqueId = DateTime.now().millisecondsSinceEpoch;
+      final dirPath = '/stress_$uniqueId';
+      final dir = fs.directory(dirPath);
+      await dir.create();
+
+      final fileCount = 50;
+      final futures = <Future>[];
+
+      for (var i = 0; i < fileCount; i++) {
+        futures.add(
+          fs.file('$dirPath/file_$i.txt').writeAsString('Content of file $i'),
+        );
+      }
+      await Future.wait(futures);
+
+      final entities = await dir.list().toList();
+      expect(entities.length, equals(fileCount));
+
+      final names = entities.map((e) => fs.path.basename(e.path)).toSet();
+      for (var i = 0; i < fileCount; i++) {
+        expect(names, contains('file_$i.txt'));
+        final content = await fs.file('$dirPath/file_$i.txt').readAsString();
+        expect(content, equals('Content of file $i'));
+      }
+    });
+
+    test('Temporary directory usage', () async {
+      final tempDir = await fs.systemTempDirectory.createTemp('my_prefix_');
+      expect(tempDir.path, startsWith('/tmp/my_prefix_'));
+      expect(await tempDir.exists(), isTrue);
+
+      final file = fs.file(fs.path.join(tempDir.path, 'test.txt'));
+      await file.writeAsString('temp content');
+      expect(await file.readAsString(), equals('temp content'));
+
+      await tempDir.delete(recursive: true);
+      expect(await tempDir.exists(), isFalse);
+      expect(await file.exists(), isFalse);
+    });
+
+    test('Different files with the same bytes (deduplication/collision check)', () async {
+      final uniqueId = DateTime.now().millisecondsSinceEpoch;
+      final data = Uint8List.fromList([1, 2, 3, 4, 5]);
+
+      final file1 = fs.file('/file1_$uniqueId.bin');
+      final file2 = fs.file('/file2_$uniqueId.bin');
+
+      await file1.writeAsBytes(data);
+      await file2.writeAsBytes(data);
+
+      expect(await file1.readAsBytes(), equals(data));
+      expect(await file2.readAsBytes(), equals(data));
+
+      // Update one, ensure other is unchanged
+      final newData = Uint8List.fromList([6, 7, 8]);
+      await file1.writeAsBytes(newData);
+
+      expect(await file1.readAsBytes(), equals(newData));
+      expect(await file2.readAsBytes(), equals(data));
+
+      // Cleanup
+      await file1.delete();
+      await file2.delete();
+
+      expect(await file1.exists(), isFalse);
+      expect(await file2.exists(), isFalse);
+    });
+
+    test('Resource cleanup verification (Blob leak check)', () async {
+      final uniqueId = DateTime.now().millisecondsSinceEpoch;
+      final filePath = '/leak_test_$uniqueId.bin';
+      final data = Uint8List.fromList(List.generate(100, (i) => i));
+
+      final file = fs.file(filePath);
+      await file.writeAsBytes(data);
+
+      final inode = await fs.resolvepath(filePath);
+      final blobId = inode.blobId;
+      expect(blobId, isNotNull);
+
+      // Verify blob exists in store
+      if (inode.storageType == 1) {
+        expect(await fs.idbStore.getBlob(blobId!), isNotNull);
+      } else {
+        expect(await fs.opfs.getBlob(blobId!), isNotNull);
+      }
+
+      await file.delete();
+
+      // Verify blob is gone
+      if (inode.storageType == 1) {
+        expect(() => fs.idbStore.getBlob(blobId!), throwsA(anything));
+      } else {
+        expect(() => fs.opfs.getBlob(blobId!), throwsA(anything));
+      }
+    });
+  });
+}