Add more specific cause on web development tool error output (#98553)
diff --git a/packages/flutter_tools/lib/src/convert.dart b/packages/flutter_tools/lib/src/convert.dart
index fb5f64f..70ac4ce 100644
--- a/packages/flutter_tools/lib/src/convert.dart
+++ b/packages/flutter_tools/lib/src/convert.dart
@@ -52,7 +52,7 @@
// was malformed.
if (reportErrors && result.contains('\u{FFFD}')) {
throwToolExit(
- 'Bad UTF-8 encoding found while decoding string: $result. '
+ 'Bad UTF-8 encoding (U+FFFD; REPLACEMENT CHARACTER) found while decoding string: $result. '
'The Flutter team would greatly appreciate if you could file a bug explaining '
'exactly what you were doing when this happened:\n'
'https://github.com/flutter/flutter/issues/new/choose\n'
diff --git a/packages/flutter_tools/test/general.shard/convert_test.dart b/packages/flutter_tools/test/general.shard/convert_test.dart
new file mode 100644
index 0000000..130bfdf
--- /dev/null
+++ b/packages/flutter_tools/test/general.shard/convert_test.dart
@@ -0,0 +1,41 @@
+// Copyright 2014 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_tools/src/base/common.dart';
+import 'package:flutter_tools/src/convert.dart';
+
+import '../src/common.dart';
+
+void main() {
+ late String passedString;
+ late String nonpassString;
+
+ const Utf8Decoder decoder = Utf8Decoder();
+
+ setUp(() {
+ passedString = 'normal string';
+ nonpassString = 'malformed string => �';
+ });
+
+ testWithoutContext('Decode a normal string', () async {
+ assert(passedString != null);
+
+ expect(decoder.convert(passedString.codeUnits), passedString);
+ });
+
+ testWithoutContext('Decode a malformed string', () async {
+ assert(nonpassString != null);
+
+ expect(
+ () => decoder.convert(nonpassString.codeUnits),
+ throwsA(
+ isA<ToolExit>().having(
+ (ToolExit error) => error.message,
+ 'message',
+ contains('(U+FFFD; REPLACEMENT CHARACTER)'), // Added paragraph
+ ),
+ ),
+ );
+ });
+}
