refactor: migrate test , test_driver , test_goldens

test/code_segments_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.9
-
 import 'package:test/test.dart';
 
 import '../tool/codeviewer_cli/segment_generator.dart';

test/demo_descriptions_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.9
-
 import 'package:collection/collection.dart';
 import 'package:flutter_gen/gen_l10n/gallery_localizations_en.dart';
 import 'package:flutter_test/flutter_test.dart';

test/l10n_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.9
-
 import 'package:test/test.dart';
 
 import '../tool/l10n_cli/l10n_cli.dart';

test/pages/home_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.9
-
 import 'package:flutter/material.dart';
 import 'package:flutter_gen/gen_l10n/gallery_localizations.dart';
 import 'package:flutter_test/flutter_test.dart';

test/restoration_test.dart

@@ -1,5 +1,3 @@
-// @dart=2.9
-
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:gallery/data/demos.dart';

test/utils.dart

@@ -2,7 +2,5 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.9
-
 // Replace Windows line endings with Unix line endings
 String standardizeLineEndings(String str) => str.replaceAll('\r\n', '\n');

test/widget_test.dart

@@ -2,6 +2,4 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.9
-
 void main() {}

test_driver/transitions_perf.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.9
-
 import 'dart:async';
 import 'dart:convert' show JsonEncoder;
 
@@ -14,7 +12,7 @@ import 'package:gallery/main.dart' show GalleryApp;
 
 // See transitions_perf_test.dart for how to run this test.
 
-Future<String> _handleMessages(String message) async {
+Future<String> _handleMessages(String? message) async {
  switch (message) {
  case 'demoDescriptions':
  final demoDescriptions = allGalleryDemoDescriptions();

test_driver/transitions_perf_test.dart

@@ -2,9 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.9
-
-import 'dart:async';
 import 'dart:convert' show json;
 import 'dart:io' show sleep, stdout;
 
@@ -131,12 +128,12 @@ Future<bool> isPresent(SerializableFinder finder, FlutterDriver driver,
 Future<void> runDemos(
  List<String> demos,
  FlutterDriver driver, {
- Future<void> Function() additionalActions,
+ Future<void> Function()? additionalActions,
  bool scrollToTopWhenDone = true,
 }) async {
- String currentDemoCategory;
- SerializableFinder demoList;
- SerializableFinder demoItem;
+ String? currentDemoCategory;
+ late SerializableFinder demoList;
+ SerializableFinder? demoItem;
 
  for (final demo in demos) {
  if (_skippedDemos.contains(demo)) continue;
@@ -199,15 +196,15 @@ Future<void> runDemos(
  stdout.writeln('< Success');
  }
 
- if (scrollToTopWhenDone) await scrollToTop(demoItem, driver);
+ if (scrollToTopWhenDone) await scrollToTop(demoItem!, driver);
 }
 
 void main([List<String> args = const <String>[]]) {
  group('Flutter Gallery transitions', () {
- FlutterDriver driver;
+ late FlutterDriver driver;
 
- bool isTestingCraneOnly;
- bool isTestingReplyOnly;
+ late bool isTestingCraneOnly;
+ late bool isTestingReplyOnly;
 
  setUpAll(() async {
  driver = await FlutterDriver.connect();
@@ -235,9 +232,7 @@ void main([List<String> args = const <String>[]]) {
  });
 
  tearDownAll(() async {
- if (driver != null) {
- await driver.close();
- }
+ await driver.close();
 
  stdout.writeln(
  'Timeline summaries for profiled demos have been output to the build/ directory.');

test_goldens/demo_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.9
-
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 

test_goldens/flutter_test_config.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.9
-
 import 'dart:async';
 import 'dart:io';
 

test_goldens/home_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.9
-
 import 'package:flutter/cupertino.dart';
 import 'package:flutter_test/flutter_test.dart';
 

test_goldens/testing/font_loader.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.9
-
 import 'dart:convert';
 import 'dart:io';
 
@@ -20,15 +18,17 @@ Future<void> loadFonts() async {
  ..addAll(loadFontsFromTestingDir()));
 }
 
-Future<Map<String, List<Future<ByteData>>>> loadFontsFromManifest() async {
- final fontManifest = await rootBundle.loadStructuredData<Iterable<dynamic>>(
+Future<Map<String?, List<Future<ByteData>>>> loadFontsFromManifest() async {
+ final List<dynamic> fontManifest =
+ await (rootBundle.loadStructuredData<List<dynamic>>(
  'FontManifest.json',
- (data) async => json.decode(data) as Iterable<dynamic>,
- );
- final fontFamilyToData = <String, List<Future<ByteData>>>{};
+ (data) async => json.decode(data) as List<dynamic>,
+ ));
+
+ final fontFamilyToData = <String?, List<Future<ByteData>>>{};
  for (final fontData in fontManifest) {
- final fontFamily = fontData['family'] as String;
- final fonts = fontData['fonts'] as Iterable<dynamic>;
+ final fontFamily = fontData['family'] as String?;
+ final fonts = fontData['fonts'] as List<dynamic>;
  for (final font in fonts) {
  (fontFamilyToData[fontFamily] ??= [])
  .add(rootBundle.load(font['asset'] as String));
@@ -77,10 +77,11 @@ Map<String, List<Future<ByteData>>> loadGoogleFonts() {
  return fontFamilyToData;
 }
 
-Future<void> _load(Map<String, List<Future<ByteData>>> fontFamilyToData) async {
+Future<void> _load(
+ Map<String?, List<Future<ByteData>>> fontFamilyToData) async {
  final waitList = <Future<void>>[];
  for (final entry in fontFamilyToData.entries) {
- final loader = FontLoader(entry.key);
+ final loader = FontLoader(entry.key!);
  for (final data in entry.value) {
  loader.addFont(data);
  }

test_goldens/testing/precache_images.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.9
-
 import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 
@@ -13,7 +11,7 @@ Future<void> pumpWidgetWithImages(
  Widget widget,
  List<String> assetNames,
 ) async {
- Future<void> precacheFuture;
+ Future<void>? precacheFuture;
  await tester.pumpWidget(
  Builder(builder: (buildContext) {
  precacheFuture = tester.runAsync(() async {

test_goldens/testing/util.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.9
-
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';