Add sample data dropdown to landing screen for use in integration tests

packages/devtools_app/lib/main.dart

@@ -20,19 +20,23 @@ import 'src/shared/feature_flags.dart';
 import 'src/shared/globals.dart';
 import 'src/shared/preferences.dart';
 import 'src/shared/primitives/url_utils.dart';
+import 'src/shared/primitives/utils.dart';
 
 void main() async {
   await runDevTools();
 }
 
-Future<void> runDevTools({bool shouldEnableExperiments = false}) async {
+Future<void> runDevTools({
+  bool shouldEnableExperiments = false,
+  List<DevToolsJsonFile> sampleData = const [],
+}) async {
   // Before switching to URL path strategy, check if this URL is in the legacy
   // fragment format and redirect if necessary.
   if (_handleLegacyUrl()) return;
 
   usePathUrlStrategy();
 
-  // This may be from our Flutter integration tests. Since we call
+  // This may be set to true from our Flutter integration tests. Since we call
   // [runDevTools] from Dart code, we cannot set the 'enable_experiments'
   // environment variable before calling [runDevTools].
   if (shouldEnableExperiments) {
@@ -61,7 +65,11 @@ Future<void> runDevTools({bool shouldEnableExperiments = false}) async {
     runApp(
       ProviderScope(
         observers: const [ErrorLoggerObserver()],
-        child: DevToolsApp(defaultScreens, await analyticsController),
+        child: DevToolsApp(
+          defaultScreens,
+          await analyticsController,
+          sampleData: sampleData,
+        ),
       ),
     );
   });

packages/devtools_app/lib/src/app.dart

@@ -47,6 +47,7 @@ import 'shared/console/primitives/simple_items.dart';
 import 'shared/dialogs.dart';
 import 'shared/globals.dart';
 import 'shared/primitives/auto_dispose.dart';
+import 'shared/primitives/utils.dart';
 import 'shared/routing.dart';
 import 'shared/screen.dart';
 import 'shared/snapshot_screen.dart';
@@ -65,11 +66,13 @@ const showVmDeveloperMode = false;
 class DevToolsApp extends StatefulWidget {
   const DevToolsApp(
     this.screens,
-    this.analyticsController,
-  );
+    this.analyticsController, {
+    this.sampleData = const [],
+  });
 
   final List<DevToolsScreen> screens;
   final AnalyticsController analyticsController;
+  final List<DevToolsJsonFile> sampleData;
 
   @override
   State<DevToolsApp> createState() => DevToolsAppState();
@@ -208,7 +211,7 @@ class DevToolsAppState extends State<DevToolsApp> with AutoDisposeMixin {
           ReportFeedbackButton(),
           OpenAboutAction(),
         ],
-        child: LandingScreenBody(),
+        child: LandingScreenBody(sampleData: widget.sampleData),
       );
     }
 

packages/devtools_app/lib/src/framework/landing_screen.dart

@@ -5,6 +5,7 @@
 import 'dart:async';
 
 import 'package:devtools_shared/devtools_shared.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
@@ -30,6 +31,10 @@ import 'framework_core.dart';
 /// available as well as to provide access to other functionality that does not
 /// require a connected Dart application.
 class LandingScreenBody extends StatefulWidget {
+  const LandingScreenBody({this.sampleData = const []});
+
+  final List<DevToolsJsonFile> sampleData;
+
   @override
   State<LandingScreenBody> createState() => _LandingScreenBodyState();
 }
@@ -45,12 +50,12 @@ class _LandingScreenBodyState extends State<LandingScreenBody> {
   Widget build(BuildContext context) {
     return Scrollbar(
       child: ListView(
-        children: const [
-          ConnectDialog(),
-          SizedBox(height: defaultSpacing),
-          ImportFileInstructions(),
-          SizedBox(height: defaultSpacing),
-          AppSizeToolingInstructions(),
+        children: [
+          const ConnectDialog(),
+          const SizedBox(height: defaultSpacing),
+          ImportFileInstructions(sampleData: widget.sampleData),
+          const SizedBox(height: defaultSpacing),
+          const AppSizeToolingInstructions(),
         ],
       ),
     );
@@ -247,7 +252,10 @@ class _ConnectDialogState extends State<ConnectDialog>
 }
 
 class ImportFileInstructions extends StatelessWidget {
-  const ImportFileInstructions({Key? key}) : super(key: key);
+  const ImportFileInstructions({Key? key, this.sampleData = const []})
+      : super(key: key);
+
+  final List<DevToolsJsonFile> sampleData;
 
   @override
   Widget build(BuildContext context) {
@@ -275,6 +283,10 @@ class ImportFileInstructions extends StatelessWidget {
               iconData: Icons.file_upload,
             ),
           ),
+          if (sampleData.isNotEmpty && !kReleaseMode) ...[
+            const SizedBox(height: defaultSpacing),
+            SampleDataDropDownButton(sampleData: sampleData),
+          ]
         ],
       ),
     );
@@ -335,3 +347,55 @@ class AppSizeToolingInstructions extends StatelessWidget {
     DevToolsRouterDelegate.of(context).navigate(appSizePageId);
   }
 }
+
+class SampleDataDropDownButton extends StatefulWidget {
+  const SampleDataDropDownButton({
+    super.key,
+    this.sampleData = const [],
+  });
+
+  final List<DevToolsJsonFile> sampleData;
+
+  @override
+  State<SampleDataDropDownButton> createState() =>
+      _SampleDataDropDownButtonState();
+}
+
+class _SampleDataDropDownButtonState extends State<SampleDataDropDownButton> {
+  DevToolsJsonFile? value;
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      children: [
+        RoundedDropDownButton<DevToolsJsonFile>(
+          value: value,
+          items: [
+            for (final data in widget.sampleData) _buildMenuItem(data),
+          ],
+          onChanged: (file) => setState(() {
+            value = file;
+          }),
+        ),
+        const SizedBox(width: defaultSpacing),
+        ElevatedButton(
+          onPressed: value == null
+              ? null
+              : () => Provider.of<ImportController>(context, listen: false)
+                  .importData(value!),
+          child: const MaterialIconLabel(
+            label: 'Load sample data',
+            iconData: Icons.file_upload,
+          ),
+        ),
+      ],
+    );
+  }
+
+  DropdownMenuItem<DevToolsJsonFile> _buildMenuItem(DevToolsJsonFile file) {
+    return DropdownMenuItem<DevToolsJsonFile>(
+      value: file,
+      child: Text(file.path),
+    );
+  }
+}

packages/devtools_app/test/shared/landing_screen_test.dart

@@ -2,12 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:devtools_app/devtools_app.dart';
 import 'package:devtools_app/src/framework/landing_screen.dart';
-import 'package:devtools_app/src/service/service_manager.dart';
-import 'package:devtools_app/src/shared/config_specific/ide_theme/ide_theme.dart';
-import 'package:devtools_app/src/shared/globals.dart';
 import 'package:devtools_test/devtools_test.dart';
-import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {
@@ -20,8 +18,38 @@ void main() {
       'Landing screen displays without error', const Size(2000.0, 2000.0),
       (WidgetTester tester) async {
     // Build our app and trigger a frame.
-    await tester.pumpWidget(wrap(LandingScreenBody()));
-    expect(find.text('Connect to a Running App'), findsOneWidget);
-    expect(find.text('App Size Tooling'), findsOneWidget);
+    await tester.pumpWidget(wrap(const LandingScreenBody()));
+    expect(find.byType(ConnectDialog), findsOneWidget);
+    expect(find.byType(ImportFileInstructions), findsOneWidget);
+    expect(find.byType(SampleDataDropDownButton), findsNothing);
+    expect(find.byType(AppSizeToolingInstructions), findsOneWidget);
+  });
+
+  testWidgetsWithWindowSize(
+      'Landing screen displays sample data picker', const Size(2000.0, 2000.0),
+      (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(
+      wrap(
+        LandingScreenBody(
+          sampleData: [
+            DevToolsJsonFile(
+              name: 'test-data',
+              lastModifiedTime: DateTime.now(),
+              data: <String, Object?>{},
+            ),
+          ],
+        ),
+      ),
+    );
+    expect(find.byType(ConnectDialog), findsOneWidget);
+    expect(find.byType(ImportFileInstructions), findsOneWidget);
+    expect(find.byType(SampleDataDropDownButton), findsOneWidget);
+    expect(find.byType(AppSizeToolingInstructions), findsOneWidget);
+
+    await tester.tap(find.byType(DropdownButton<DevToolsJsonFile>));
+    await tester.pumpAndSettle();
+
+    expect(find.text('test-data'), findsNWidgets(2));
   });
 }