Trace animated dialog opening

.vscode/launch.json

@@ -57,6 +57,7 @@
             "name": "Integration Test",
             "request": "launch",
             "type": "dart",
+            "flutterMode": "profile",
             "args": [
                 "--flavor",
                 "prod",

integration_test/widget_dialog_animated_test.dart

@@ -9,7 +9,7 @@ import 'package:lightmeter/screens/metering/components/shared/readings_container
 import 'mocks/application_mock.dart';
 
 void main() {
-  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  final binding = IntegrationTestWidgetsFlutterBinding.ensureInitialized();
 
   group('AnimatedDialogPicker test', () {
     testWidgets('Tap on `ReadingValueContainer`, verify opened', (tester) async {
@@ -17,10 +17,16 @@ void main() {
       expect(find.text('Film'), findsOneWidget);
       expect(find.text('None'), findsOneWidget);
 
+      await binding.traceAction(
+        () async {
           await tester.tap(find.byType(AnimatedDialogPicker<Film>));
           await tester.pumpAndSettle(Dimens.durationL);
-      expect(find.text('Film'), findsNWidgets(2));
+        },
-      expect(find.text('None'), findsNWidgets(2));
+        reportKey: 'dialog_opening_timeline',
+      );
+
+      expect(find.text('Film'), findsNWidgets(3));
+      expect(find.text('None'), findsNWidgets(3));
     });
   });
 }

pubspec.yaml

@@ -39,6 +39,8 @@ dependencies:
 dev_dependencies:
   bloc_test: 9.1.3
   build_runner: ^2.1.7
+  flutter_driver:
+    sdk: flutter
   flutter_launcher_icons: 0.11.0
   flutter_native_splash: 2.2.16
   flutter_test:

test_driver/performance_driver.dart

@@ -0,0 +1,27 @@
+import 'package:flutter_driver/flutter_driver.dart' as driver;
+import 'package:integration_test/integration_test_driver.dart';
+
+Future<void> main() {
+  return integrationDriver(
+    responseDataCallback: (data) async {
+      if (data != null) {
+        final timeline =
+            driver.Timeline.fromJson(data['dialog_opening_timeline'] as Map<String, dynamic>);
+
+        // Convert the Timeline into a TimelineSummary that's easier to
+        // read and understand.
+        final summary = driver.TimelineSummary.summarize(timeline);
+
+        // Then, write the entire timeline to disk in a json format.
+        // This file can be opened in the Chrome browser's tracing tools
+        // found by navigating to chrome://tracing.
+        // Optionally, save the summary to disk by setting includeSummary
+        // to true
+        await summary.writeTimelineToFile(
+          'dialog_opening_timeline',
+          pretty: true,
+        );
+      }
+    },
+  );
+}

test_driver/test_driver.md

@@ -0,0 +1,9 @@
+Trace actions
+```console
+flutter drive \
+  --driver=test_driver/performance_driver.dart \
+  --target=integration_test/widget_dialog_animated_test.dart \
+  --profile \
+  --flavor=dev \
+  --no-dds
+```