Include .track in file names for cached dill files for builds with --track-widget-creation (#23299)

Ensure that cached dill files for builds with --track-widget-creation
always have .track. in the file name to avoid mixing transformed and
untransformed kernel files.

packages/flutter_tools/lib/src/base/build.dart

@@ -9,6 +9,7 @@ import 'package:meta/meta.dart';
 import '../android/android_sdk.dart';
 import '../artifacts.dart';
 import '../build_info.dart';
+import '../bundle.dart';
 import '../compile.dart';
 import '../dart/package_map.dart';
 import '../globals.dart';
@@ -293,6 +294,7 @@ class AOTSnapshotter {
     @required String mainPath,
     @required String packagesPath,
     @required String outputPath,
+    @required bool trackWidgetCreation,
     List<String> extraFrontEndOptions = const <String>[],
   }) async {
     final Directory outputDir = fs.directory(outputPath);
@@ -308,12 +310,15 @@ class AOTSnapshotter {
       sdkRoot: artifacts.getArtifactPath(Artifact.flutterPatchedSdkPath),
       mainPath: mainPath,
       packagesPath: packagesPath,
-      outputFilePath: fs.path.join(outputPath, 'app.dill'),
+      outputFilePath: getKernelPathForTransformerOptions(
+        fs.path.join(outputPath, 'app.dill'),
+        trackWidgetCreation: trackWidgetCreation,
+      ),
       depFilePath: depfilePath,
       extraFrontEndOptions: extraFrontEndOptions,
       linkPlatformKernelIn: true,
       aot: true,
-      trackWidgetCreation: false,
+      trackWidgetCreation: trackWidgetCreation,
       targetProductVm: buildMode == BuildMode.release,
     );
 

packages/flutter_tools/lib/src/bundle.dart

@@ -4,6 +4,8 @@
 
 import 'dart:async';
 
+import 'package:meta/meta.dart';
+
 import 'artifacts.dart';
 import 'asset.dart';
 import 'base/build.dart';
@@ -19,7 +21,24 @@ const String defaultMainPath = 'lib/main.dart';
 const String defaultAssetBasePath = '.';
 const String defaultManifestPath = 'pubspec.yaml';
 String get defaultDepfilePath => fs.path.join(getBuildDirectory(), 'snapshot_blob.bin.d');
-String get defaultApplicationKernelPath => fs.path.join(getBuildDirectory(), 'app.dill');
+
+String getDefaultApplicationKernelPath({@required bool trackWidgetCreation}) {
+  return getKernelPathForTransformerOptions(
+    fs.path.join(getBuildDirectory(), 'app.dill'),
+    trackWidgetCreation: trackWidgetCreation,
+  );
+}
+
+String getKernelPathForTransformerOptions(
+  String path, {
+  @required bool trackWidgetCreation,
+}) {
+  if (trackWidgetCreation) {
+    path += '.track.dill';
+  }
+  return path;
+}
+
 const String defaultPrivateKeyPath = 'privatekey.der';
 
 const String _kKernelKey = 'kernel_blob.bin';
@@ -50,7 +69,7 @@ Future<void> build({
   depfilePath ??= defaultDepfilePath;
   assetDirPath ??= getAssetBuildDirectory();
   packagesPath ??= fs.path.absolute(PackageMap.globalPackagesPath);
-  applicationKernelFilePath ??= defaultApplicationKernelPath;
+  applicationKernelFilePath ??= getDefaultApplicationKernelPath(trackWidgetCreation: trackWidgetCreation);
 
   DevFSContent kernelContent;
   if (!precompiledSnapshot) {

packages/flutter_tools/lib/src/commands/build_aot.dart

@@ -85,6 +85,7 @@ class BuildAotCommand extends BuildSubCommand {
         buildMode: buildMode,
         mainPath: mainPath,
         packagesPath: PackageMap.globalPackagesPath,
+        trackWidgetCreation: false,
         outputPath: outputPath,
         extraFrontEndOptions: argResults[FlutterOptions.kExtraFrontEndOptions],
       );

packages/flutter_tools/lib/src/commands/build_bundle.dart

@@ -23,7 +23,6 @@ class BuildBundleCommand extends BuildSubCommand {
       ..addOption('manifest', defaultsTo: defaultManifestPath)
       ..addOption('private-key', defaultsTo: defaultPrivateKeyPath)
       ..addOption('depfile', defaultsTo: defaultDepfilePath)
-      ..addOption('kernel-file', defaultsTo: defaultApplicationKernelPath)
       ..addOption('target-platform',
         defaultsTo: 'android-arm',
         allowed: <String>['android-arm', 'android-arm64', 'ios']
@@ -92,7 +91,6 @@ class BuildBundleCommand extends BuildSubCommand {
       buildMode: buildMode,
       mainPath: targetFile,
       manifestPath: argResults['manifest'],
-      applicationKernelFilePath: argResults['kernel-file'],
       depfilePath: argResults['depfile'],
       privateKeyPath: argResults['private-key'],
       assetDirPath: argResults['asset-dir'],

packages/flutter_tools/lib/src/commands/fuchsia_reload.dart

@@ -165,7 +165,8 @@ class FuchsiaReloadCommand extends FlutterCommand {
           debuggingOptions: DebuggingOptions.enabled(getBuildInfo()),
           target: _target,
           projectRootPath: _fuchsiaProjectPath,
-              packagesFilePath: _dotPackagesPath);
+          packagesFilePath: _dotPackagesPath,
+        );
         printStatus('Connecting to $_modName');
         await hotRunner.attach();
       } finally {

packages/flutter_tools/lib/src/compile.dart

@@ -5,6 +5,7 @@
 import 'dart:async';
 import 'dart:convert';
 
+import 'package:meta/meta.dart';
 import 'package:usage/uuid/uuid.dart';
 
 import 'artifacts.dart';
@@ -123,7 +124,7 @@ class KernelCompiler {
     String depFilePath,
     bool linkPlatformKernelIn = false,
     bool aot = false,
-    bool trackWidgetCreation = false,
+    @required bool trackWidgetCreation,
     List<String> extraFrontEndOptions,
     String incrementalCompilerByteStorePath,
     String packagesPath,
@@ -331,7 +332,8 @@ class ResidentCompiler {
   /// Binary file name is returned if compilation was successful, otherwise
   /// null is returned.
   Future<CompilerOutput> recompile(String mainPath, List<String> invalidatedFiles,
-      {String outputPath, String packagesFilePath}) async {
+      {@required String outputPath, String packagesFilePath}) async {
+    assert (outputPath != null);
     if (!_controller.hasListener) {
       _controller.stream.listen(_handleCompilationRequest);
     }

packages/flutter_tools/lib/src/devfs.dart

@@ -13,6 +13,7 @@ import 'base/context.dart';
 import 'base/file_system.dart';
 import 'base/io.dart';
 import 'build_info.dart';
+import 'bundle.dart';
 import 'compile.dart';
 import 'dart/package_map.dart';
 import 'globals.dart';
@@ -431,10 +432,13 @@ class DevFS {
     Set<String> fileFilter,
     @required ResidentCompiler generator,
     String dillOutputPath,
+    @required bool trackWidgetCreation,
     bool fullRestart = false,
     String projectRootPath,
     @required String pathToReload,
   }) async {
+    assert(trackWidgetCreation != null);
+    assert(generator != null);
     // Mark all entries as possibly deleted.
     for (DevFSContent content in _entries.values) {
       content._exists = false;
@@ -526,7 +530,7 @@ class DevFS {
     final CompilerOutput compilerOutput = await generator.recompile(
       mainPath,
       invalidatedFiles,
-      outputPath:  dillOutputPath ?? fs.path.join(getBuildDirectory(), 'app.dill'),
+      outputPath:  dillOutputPath ?? getDefaultApplicationKernelPath(trackWidgetCreation: trackWidgetCreation),
       packagesFilePath : _packagesFilePath,
     );
     // Don't send full kernel file that would overwrite what VM already

packages/flutter_tools/lib/src/resident_runner.dart

@@ -30,13 +30,14 @@ import 'vmservice.dart';
 
 class FlutterDevice {
   FlutterDevice(this.device, {
-    @required bool trackWidgetCreation,
+    @required this.trackWidgetCreation,
     this.dillOutputPath,
     this.fileSystemRoots,
     this.fileSystemScheme,
     this.viewFilter,
     ResidentCompiler generator,
-  }) : generator = generator ?? ResidentCompiler(
+  }) : assert(trackWidgetCreation != null),
+       generator = generator ?? ResidentCompiler(
          artifacts.getArtifactPath(Artifact.flutterPatchedSdkPath),
          trackWidgetCreation: trackWidgetCreation,
          fileSystemRoots: fileSystemRoots, fileSystemScheme: fileSystemScheme
@@ -53,6 +54,7 @@ class FlutterDevice {
   String fileSystemScheme;
   StreamSubscription<String> _loggingSubscription;
   final String viewFilter;
+  final bool trackWidgetCreation;
 
   /// If the [reloadSources] parameter is not null the 'reloadSources' service
   /// will be registered.
@@ -390,6 +392,7 @@ class FlutterDevice {
         generator: generator,
         fullRestart: fullRestart,
         dillOutputPath: dillOutputPath,
+        trackWidgetCreation: trackWidgetCreation,
         projectRootPath: projectRootPath,
         pathToReload: pathToReload
       );
@@ -443,6 +446,7 @@ abstract class ResidentRunner {
   String _mainPath;
   String get mainPath => _mainPath;
   String getReloadPath({bool fullRestart}) => mainPath + (fullRestart ? '' : '.incremental') + '.dill';
+
   AssetBundle _assetBundle;
   AssetBundle get assetBundle => _assetBundle;
 

packages/flutter_tools/lib/src/test/flutter_platform.dart

@@ -20,6 +20,7 @@ import '../base/io.dart';
 import '../base/process_manager.dart';
 import '../base/terminal.dart';
 import '../build_info.dart';
+import '../bundle.dart';
 import '../compile.dart';
 import '../dart/package_map.dart';
 import '../globals.dart';
@@ -230,7 +231,10 @@ class _Compiler {
       printError('$message');
     }
 
-    final String testFilePath = fs.path.join(fs.path.fromUri(projectRootDirectory), getBuildDirectory(), 'testfile.dill');
+    final String testFilePath = getKernelPathForTransformerOptions(
+      fs.path.join(fs.path.fromUri(projectRootDirectory), getBuildDirectory(), 'testfile.dill'),
+      trackWidgetCreation: trackWidgetCreation,
+    );
 
     ResidentCompiler createCompiler() {
       return ResidentCompiler(

packages/flutter_tools/lib/src/tester/flutter_tester.dart

@@ -127,8 +127,10 @@ class FlutterTesterDevice extends Device {
 
     // Build assets and perform initial compilation.
     final String assetDirPath = getAssetBuildDirectory();
-    final String applicationKernelFilePath =
-        fs.path.join(getBuildDirectory(), 'flutter-tester-app.dill');
+    final String applicationKernelFilePath = bundle.getKernelPathForTransformerOptions(
+      fs.path.join(getBuildDirectory(), 'flutter-tester-app.dill'),
+      trackWidgetCreation: buildInfo.trackWidgetCreation,
+    );
     await bundle.build(
       mainPath: mainPath,
       assetDirPath: assetDirPath,
@@ -138,10 +140,7 @@ class FlutterTesterDevice extends Device {
     );
     command.add('--flutter-assets-dir=$assetDirPath');
 
-    // TODO(scheglov): Either remove the check, or make it fail earlier.
-    if (applicationKernelFilePath != null) {
-      command.add(applicationKernelFilePath);
-    }
+    command.add(applicationKernelFilePath);
 
     try {
       printTrace(command.join(' '));

packages/flutter_tools/test/compile_test.dart

@@ -48,7 +48,8 @@ void main() {
             ))
           ));
       final CompilerOutput output = await kernelCompiler.compile(sdkRoot: '/path/to/sdkroot',
-        mainPath: '/path/to/main.dart'
+        mainPath: '/path/to/main.dart',
+        trackWidgetCreation: false,
       );
       expect(mockFrontendServerStdIn.getAndClear(), isEmpty);
       expect(logger.errorText, equals('\nCompiler message:\nline1\nline2\n'));
@@ -70,7 +71,8 @@ void main() {
           ));
 
       final CompilerOutput output = await kernelCompiler.compile(sdkRoot: '/path/to/sdkroot',
-        mainPath: '/path/to/main.dart'
+        mainPath: '/path/to/main.dart',
+        trackWidgetCreation: false,
       );
       expect(mockFrontendServerStdIn.getAndClear(), isEmpty);
       expect(logger.errorText, equals('\nCompiler message:\nline1\nline2\n'));
@@ -93,8 +95,10 @@ void main() {
           ))
       ));
 
-      final CompilerOutput output = await kernelCompiler.compile(sdkRoot: '/path/to/sdkroot',
-          mainPath: '/path/to/main.dart'
+      final CompilerOutput output = await kernelCompiler.compile(
+        sdkRoot: '/path/to/sdkroot',
+        mainPath: '/path/to/main.dart',
+        trackWidgetCreation: false,
       );
       expect(mockFrontendServerStdIn.getAndClear(), isEmpty);
       expect(logger.errorText, equals('\nCompiler message:\nline1\nline2\n'));
@@ -149,7 +153,9 @@ void main() {
           ));
 
       final CompilerOutput output = await generator.recompile(
-        '/path/to/main.dart', null /* invalidatedFiles */
+        '/path/to/main.dart',
+          null /* invalidatedFiles */,
+        outputPath: '/build/',
       );
       expect(mockFrontendServerStdIn.getAndClear(), 'compile /path/to/main.dart\n');
       verifyNoMoreInteractions(mockFrontendServerStdIn);
@@ -167,7 +173,9 @@ void main() {
       );
 
       final CompilerOutput output = await generator.recompile(
-          '/path/to/main.dart', null /* invalidatedFiles */
+        '/path/to/main.dart',
+        null, /* invalidatedFiles */
+        outputPath: '/build/',
       );
       expect(output, equals(null));
     }, overrides: <Type, Generator>{
@@ -183,7 +191,11 @@ void main() {
       when(mockFrontendServer.stdout)
           .thenAnswer((Invocation invocation) => streamController.stream);
       streamController.add(utf8.encode('result abc\nline0\nline1\nabc /path/to/main.dart.dill 0\n'));
-      await generator.recompile('/path/to/main.dart', null /* invalidatedFiles */);
+      await generator.recompile(
+        '/path/to/main.dart',
+        null, /* invalidatedFiles */
+        outputPath: '/build/',
+      );
       expect(mockFrontendServerStdIn.getAndClear(), 'compile /path/to/main.dart\n');
 
       await _recompile(streamController, generator, mockFrontendServerStdIn,
@@ -210,7 +222,7 @@ void main() {
       streamController.add(utf8.encode(
         'result abc\nline0\nline1\nabc /path/to/main.dart.dill 0\n'
       ));
-      await generator.recompile('/path/to/main.dart', null /* invalidatedFiles */);
+      await generator.recompile('/path/to/main.dart', null /* invalidatedFiles */, outputPath: '/build/');
       expect(mockFrontendServerStdIn.getAndClear(), 'compile /path/to/main.dart\n');
 
       await _recompile(streamController, generator, mockFrontendServerStdIn,
@@ -292,7 +304,9 @@ void main() {
       )));
 
       await generator.recompile(
-          '/path/to/main.dart', null /* invalidatedFiles */
+        '/path/to/main.dart',
+        null, /* invalidatedFiles */
+        outputPath: '/build/',
       ).then((CompilerOutput output) {
         expect(mockFrontendServerStdIn.getAndClear(),
             'compile /path/to/main.dart\n');
@@ -339,7 +353,9 @@ void main() {
 
       // The test manages timing via completers.
       generator.recompile( // ignore: unawaited_futures
-          '/path/to/main.dart', null /* invalidatedFiles */
+        '/path/to/main.dart',
+        null, /* invalidatedFiles */
+        outputPath: '/build/',
       ).then((CompilerOutput outputCompile) {
         expect(logger.errorText,
             equals('\nCompiler message:\nline1\nline2\n'));
@@ -394,7 +410,11 @@ Future<void> _recompile(StreamController<List<int>> streamController,
   scheduleMicrotask(() {
     streamController.add(utf8.encode(mockCompilerOutput));
   });
-  final CompilerOutput output = await generator.recompile(null /* mainPath */, <String>['/path/to/main.dart']);
+  final CompilerOutput output = await generator.recompile(
+    null /* mainPath */,
+    <String>['/path/to/main.dart'],
+    outputPath: '/build/',
+  );
   expect(output.outputFilename, equals('/path/to/main.dart.dill'));
   final String commands = mockFrontendServerStdIn.getAndClear();
   final RegExp re = RegExp('^recompile (.*)\\n/path/to/main.dart\\n(.*)\\n\$');

packages/flutter_tools/test/devfs_test.dart

@@ -119,13 +119,25 @@ void main() {
       devFSOperations.expectMessages(<String>['create test']);
       expect(devFS.assetPathsToEvict, isEmpty);
 
-      final int bytes = await devFS.update(
+      int bytes = await devFS.update(
         mainPath: 'lib/foo.txt',
         generator: residentCompiler,
         pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: false,
       );
       devFSOperations.expectMessages(<String>[
-        'writeFile test lib/foo.txt.dill',
+        'writeFile test lib/foo.txt.dill build/app.dill',
+      ]);
+      expect(devFS.assetPathsToEvict, isEmpty);
+
+      bytes = await devFS.update(
+        mainPath: 'lib/foo.txt',
+        generator: residentCompiler,
+        pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: true,
+      );
+      devFSOperations.expectMessages(<String>[
+        'writeFile test lib/foo.txt.dill build/app.dill.track.dill',
       ]);
       expect(devFS.assetPathsToEvict, isEmpty);
 
@@ -142,9 +154,10 @@ void main() {
         mainPath: 'lib/foo.txt',
         generator: residentCompiler,
         pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: false,
       );
       devFSOperations.expectMessages(<String>[
-        'writeFile test lib/foo.txt.dill',
+        'writeFile test lib/foo.txt.dill build/app.dill',
       ]);
       expect(devFS.assetPathsToEvict, isEmpty);
       expect(bytes, 22);
@@ -157,9 +170,10 @@ void main() {
         mainPath: 'lib/foo.txt',
         generator: residentCompiler,
         pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: false,
       );
       devFSOperations.expectMessages(<String>[
-        'writeFile test lib/foo.txt.dill',
+        'writeFile test lib/foo.txt.dill build/app.dill',
       ]);
       expect(devFS.assetPathsToEvict, isEmpty);
       expect(bytes, 22);
@@ -171,9 +185,10 @@ void main() {
         mainPath: 'lib/foo.txt',
         generator: residentCompiler,
         pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: false,
       );
       devFSOperations.expectMessages(<String>[
-        'writeFile test lib/foo.txt.dill',
+        'writeFile test lib/foo.txt.dill build/app.dill',
       ]);
       expect(devFS.assetPathsToEvict, isEmpty);
       expect(bytes, 22);
@@ -183,12 +198,41 @@ void main() {
         mainPath: 'lib/foo.txt',
         generator: residentCompiler,
         pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: false,
       );
       devFSOperations.expectMessages(<String>[
-        'writeFile test lib/foo.txt.dill',
+        'writeFile test lib/foo.txt.dill build/app.dill',
       ]);
       expect(devFS.assetPathsToEvict, isEmpty);
       expect(bytes, 22);
+
+      // Set the last modified time to 5 seconds in the past.
+      updateFileModificationTime(file.path, DateTime.now(), -5);
+      bytes = await devFS.update(
+        mainPath: 'lib/foo.txt',
+        generator: residentCompiler,
+        pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: true,
+      );
+      devFSOperations.expectMessages(<String>[
+        'writeFile test lib/foo.txt.dill build/app.dill.track.dill',
+      ]);
+      expect(devFS.assetPathsToEvict, isEmpty);
+      expect(bytes, 22);
+
+      await file.writeAsBytes(<int>[1, 2, 3, 4, 5, 6]);
+      bytes = await devFS.update(
+        mainPath: 'lib/foo.txt',
+        generator: residentCompiler,
+        pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: true,
+      );
+      devFSOperations.expectMessages(<String>[
+        'writeFile test lib/foo.txt.dill build/app.dill.track.dill',
+      ]);
+      expect(devFS.assetPathsToEvict, isEmpty);
+      expect(bytes, 22);
+
     }, overrides: <Type, Generator>{
       FileSystem: () => fs,
     });
@@ -200,10 +244,11 @@ void main() {
         mainPath: 'lib/foo.txt',
         generator: residentCompiler,
         pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: false,
       );
       devFSOperations.expectMessages(<String>[
         'deleteFile test lib/foo.txt',
-        'writeFile test lib/foo.txt.dill',
+        'writeFile test lib/foo.txt.dill build/app.dill',
       ]);
       expect(devFS.assetPathsToEvict, isEmpty);
       expect(bytes, 22);
@@ -213,16 +258,30 @@ void main() {
 
     testUsingContext('add new package', () async {
       await _createPackage(fs, 'newpkg', 'anotherfile.txt');
-      final int bytes = await devFS.update(
+      int bytes = await devFS.update(
         mainPath: 'lib/foo.txt',
         generator: residentCompiler,
         pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: false,
       );
       devFSOperations.expectMessages(<String>[
-        'writeFile test lib/foo.txt.dill',
+        'writeFile test lib/foo.txt.dill build/app.dill',
+      ]);
+      expect(devFS.assetPathsToEvict, isEmpty);
+      expect(bytes, 22);
+
+      bytes = await devFS.update(
+        mainPath: 'lib/foo.txt',
+        generator: residentCompiler,
+        pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: true,
+      );
+      devFSOperations.expectMessages(<String>[
+        'writeFile test lib/foo.txt.dill build/app.dill.track.dill',
       ]);
       expect(devFS.assetPathsToEvict, isEmpty);
       expect(bytes, 22);
+
     }, overrides: <Type, Generator>{
       FileSystem: () => fs,
     });
@@ -248,9 +307,10 @@ void main() {
         fileFilter: fileFilter,
         generator: residentCompiler,
         pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: false,
       );
       devFSOperations.expectMessages(<String>[
-        'writeFile test lib/foo.txt.dill',
+        'writeFile test lib/foo.txt.dill build/app.dill',
       ]);
       expect(devFS.assetPathsToEvict, isEmpty);
       expect(bytes, 22);
@@ -266,10 +326,11 @@ void main() {
         bundleDirty: true,
         generator: residentCompiler,
         pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: false,
       );
       devFSOperations.expectMessages(<String>[
         'writeFile test ${_inAssetBuildDirectory(fs, 'a.txt')}',
-        'writeFile test lib/foo.txt.dill',
+        'writeFile test lib/foo.txt.dill build/app.dill',
       ]);
       expect(devFS.assetPathsToEvict, unorderedMatches(<String>['a.txt']));
       devFS.assetPathsToEvict.clear();
@@ -286,12 +347,13 @@ void main() {
         bundleDirty: true,
         generator: residentCompiler,
         pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: false,
       );
       // Expect entire asset bundle written because bundleDirty is true
       devFSOperations.expectMessages(<String>[
         'writeFile test ${_inAssetBuildDirectory(fs, 'a.txt')}',
         'writeFile test ${_inAssetBuildDirectory(fs, 'b.txt')}',
-        'writeFile test lib/foo.txt.dill',
+        'writeFile test lib/foo.txt.dill build/app.dill',
       ]);
       expect(devFS.assetPathsToEvict, unorderedMatches(<String>[
         'a.txt', 'b.txt']));
@@ -308,10 +370,11 @@ void main() {
         bundle: assetBundle,
         generator: residentCompiler,
         pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: false,
       );
       devFSOperations.expectMessages(<String>[
         'writeFile test ${_inAssetBuildDirectory(fs, 'c.txt')}',
-        'writeFile test lib/foo.txt.dill',
+        'writeFile test lib/foo.txt.dill build/app.dill',
       ]);
       expect(devFS.assetPathsToEvict, unorderedMatches(<String>[
         'c.txt']));
@@ -328,10 +391,11 @@ void main() {
         bundle: assetBundle,
         generator: residentCompiler,
         pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: false,
       );
       devFSOperations.expectMessages(<String>[
         'deleteFile test ${_inAssetBuildDirectory(fs, 'c.txt')}',
-        'writeFile test lib/foo.txt.dill',
+        'writeFile test lib/foo.txt.dill build/app.dill',
       ]);
       expect(devFS.assetPathsToEvict, unorderedMatches(<String>['c.txt']));
       devFS.assetPathsToEvict.clear();
@@ -348,11 +412,12 @@ void main() {
         bundleDirty: true,
         generator: residentCompiler,
         pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: false,
       );
       devFSOperations.expectMessages(<String>[
         'deleteFile test ${_inAssetBuildDirectory(fs, 'a.txt')}',
         'deleteFile test ${_inAssetBuildDirectory(fs, 'b.txt')}',
-        'writeFile test lib/foo.txt.dill',
+        'writeFile test lib/foo.txt.dill build/app.dill',
       ]);
       expect(devFS.assetPathsToEvict, unorderedMatches(<String>[
         'a.txt', 'b.txt'
@@ -405,6 +470,7 @@ void main() {
         mainPath: 'lib/foo.txt',
         generator: residentCompiler,
         pathToReload: 'lib/foo.txt.dill',
+        trackWidgetCreation: false,
       );
       vmService.expectMessages(<String>[
         'writeFile test lib/foo.txt.dill',

packages/flutter_tools/test/src/mocks.dart

@@ -427,7 +427,11 @@ class MockDevFSOperations extends BasicMock implements DevFSOperations {
 
   @override
   Future<dynamic> writeFile(String fsName, Uri deviceUri, DevFSContent content) async {
-    messages.add('writeFile $fsName $deviceUri');
+    String message = 'writeFile $fsName $deviceUri';
+    if (content is DevFSFileContent) {
+      message += ' ${content.file.path}';
+    }
+    messages.add(message);
     devicePathToContent[deviceUri] = content;
   }