Deflake wildcard asset test (#42597)

packages/flutter_tools/lib/src/asset.dart

@@ -91,12 +91,17 @@ class _ManifestAssetBundle implements AssetBundle {
     }
 
     for (Directory directory in _wildcardDirectories.values) {
-      final DateTime dateTime = directory.statSync().modified;
-      if (dateTime == null) {
-        continue;
+      if (!directory.existsSync()) {
+        return true; // directory was deleted.
       }
-      if (dateTime.isAfter(_lastBuildTimestamp)) {
-        return true;
+      for (File file in directory.listSync()) {
+        final DateTime dateTime = file.statSync().modified;
+        if (dateTime == null) {
+          continue;
+        }
+        if (dateTime.isAfter(_lastBuildTimestamp)) {
+          return true;
+        }
       }
     }
 

packages/flutter_tools/test/general.shard/asset_bundle_test.dart

@@ -60,7 +60,7 @@ void main() {
     });
 
     testUsingContext('wildcard directories are updated when filesystem changes', () async {
-      fs.file('.packages').createSync();
+      final File packageFile = fs.file('.packages')..createSync();
       fs.file(fs.path.join('assets', 'foo', 'bar.txt')).createSync(recursive: true);
       fs.file('pubspec.yaml')
         ..createSync()
@@ -80,11 +80,10 @@ flutter:
       expect(bundle.entries.length, 4);
       expect(bundle.needsBuild(manifestPath: 'pubspec.yaml'), false);
 
-      // Adding a file should update the stat of the directory, but instead
-      // we need to fully recreate it.
-      fs.directory(fs.path.join('assets', 'foo')).deleteSync(recursive: true);
-      fs.file(fs.path.join('assets', 'foo', 'fizz.txt')).createSync(recursive: true);
-      fs.file(fs.path.join('assets', 'foo', 'bar.txt')).createSync();
+      // Simulate modifying the files by updating the filestat time manually.
+      fs.file(fs.path.join('assets', 'foo', 'fizz.txt'))
+        ..createSync(recursive: true)
+        ..setLastModifiedSync(packageFile.lastModifiedSync().add(const Duration(hours: 1)));
 
       expect(bundle.needsBuild(manifestPath: 'pubspec.yaml'), true);
       await bundle.build(manifestPath: 'pubspec.yaml');
@@ -102,7 +101,7 @@ flutter:
 
     testUsingContext('handle removal of wildcard directories', () async {
       fs.file(fs.path.join('assets', 'foo', 'bar.txt')).createSync(recursive: true);
-      fs.file('pubspec.yaml')
+      final File pubspec = fs.file('pubspec.yaml')
         ..createSync()
         ..writeAsStringSync(r'''
 name: example
@@ -122,14 +121,17 @@ flutter:
       expect(bundle.needsBuild(manifestPath: 'pubspec.yaml'), false);
 
       // Delete the wildcard directory and update pubspec file.
+      final DateTime modifiedTime = pubspec.lastModifiedSync().add(const Duration(hours: 1));
       fs.directory(fs.path.join('assets', 'foo')).deleteSync(recursive: true);
       fs.file('pubspec.yaml')
         ..createSync()
         ..writeAsStringSync(r'''
-name: example''');
+name: example''')
+        ..setLastModifiedSync(modifiedTime);
 
       // touch .packages to make sure its change time is after pubspec.yaml's
-      fs.file('.packages').createSync();
+      fs.file('.packages')
+        ..setLastModifiedSync(modifiedTime);
 
       // Even though the previous file was removed, it is left in the
       // asset manifest and not updated. This is due to the devfs not
@@ -145,7 +147,7 @@ name: example''');
     }, overrides: <Type, Generator>{
       FileSystem: () => testFileSystem,
       ProcessManager: () => FakeProcessManager(<FakeCommand>[]),
-    }, skip: true); // https://github.com/flutter/flutter/issues/34446
+    });
   });
 
 }