feat: migrate test_data/project.dart to null safety (#92646)

packages/flutter_tools/test/integration.shard/test_data/background_project.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 = 2.8
-
 import '../test_utils.dart';
 import 'project.dart';
 

packages/flutter_tools/test/integration.shard/test_data/basic_project.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 = 2.8
-
 import 'project.dart';
 
 class BasicProject extends Project {

packages/flutter_tools/test/integration.shard/test_data/deferred_components_project.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 = 2.8
-
 import '../../src/common.dart';
 import 'deferred_components_config.dart';
 import 'project.dart';
@@ -84,7 +82,7 @@ class BasicDeferredComponentsConfig extends DeferredComponentsConfig {
   ''';
 
   @override
-  String get deferredComponentsGolden => r'''
+  String? get deferredComponentsGolden => r'''
   loading-units:
     - id: 2
       libraries:
@@ -604,7 +602,7 @@ class NoAndroidDynamicFeatureModuleDeferredComponentsConfig extends BasicDeferre
 /// Missing golden
 class NoGoldenDeferredComponentsConfig extends BasicDeferredComponentsConfig {
   @override
-  String get deferredComponentsGolden => null;
+  String? get deferredComponentsGolden => null;
 }
 
 /// Missing golden

packages/flutter_tools/test/integration.shard/test_data/gen_l10n_project.dart

@@ -2,10 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
 import 'package:file/file.dart';
-import 'package:meta/meta.dart';
 
 import '../test_utils.dart';
 import 'project.dart';
@@ -750,8 +747,8 @@ void main() {
 ''';
 
   String l10nYaml({
-    @required bool useDeferredLoading,
-    @required bool useSyntheticPackage,
+    required bool useDeferredLoading,
+    required bool useSyntheticPackage,
   }) {
     String l10nYamlString = '';
 

packages/flutter_tools/test/integration.shard/test_data/hot_reload_const_project.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 = 2.8
-
 import '../test_utils.dart';
 import 'project.dart';
 

packages/flutter_tools/test/integration.shard/test_data/hot_reload_project.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 = 2.8
-
 import '../test_utils.dart';
 import 'project.dart';
 

packages/flutter_tools/test/integration.shard/test_data/hot_reload_with_asset.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 = 2.8
-
 import '../test_utils.dart';
 import 'project.dart';
 

packages/flutter_tools/test/integration.shard/test_data/multidex_project.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 = 2.8
-
 import 'package:file/file.dart';
 
 import '../../src/common.dart';

packages/flutter_tools/test/integration.shard/test_data/project.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 = 2.8
-
 import 'package:file/file.dart';
 
 import '../test_utils.dart';
@@ -21,31 +19,32 @@ const String _kDefaultHtml  = '''
 ''';
 
 abstract class Project {
-  Directory dir;
+  late Directory dir;
 
   String get pubspec;
-  String get main;
-  String get test => null;
-  String get generatedFile => null;
-  DeferredComponentsConfig get deferredComponents => null;
+  String? get main => null;
+  String? get test => null;
+  String? get generatedFile => null;
+  DeferredComponentsConfig? get deferredComponents => null;
 
   Uri get mainDart => Uri.parse('package:test/main.dart');
 
   Future<void> setUpIn(Directory dir) async {
     this.dir = dir;
     writeFile(fileSystem.path.join(dir.path, 'pubspec.yaml'), pubspec);
+    final String? main = this.main;
     if (main != null) {
       writeFile(fileSystem.path.join(dir.path, 'lib', 'main.dart'), main);
     }
+    final String? test = this.test;
     if (test != null) {
       writeFile(fileSystem.path.join(dir.path, 'test', 'test.dart'), test);
     }
+    final String? generatedFile = this.generatedFile;
     if (generatedFile != null) {
       writeFile(fileSystem.path.join(dir.path, '.dart_tool', 'flutter_gen', 'flutter_gen.dart'), generatedFile);
     }
-    if (deferredComponents != null) {
-      deferredComponents.setUpIn(dir);
-    }
+    deferredComponents?.setUpIn(dir);
     writeFile(fileSystem.path.join(dir.path, 'web', 'index.html'), _kDefaultHtml);
     writePackages(dir.path);
     await getPackages(dir.path);

packages/flutter_tools/test/integration.shard/test_data/project_with_early_error.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 = 2.8
-
 import 'project.dart';
 
 class ProjectWithEarlyError extends Project {

packages/flutter_tools/test/integration.shard/test_data/single_widget_reload_project.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 = 2.8
-
 import '../test_utils.dart';
 import 'project.dart';
 

packages/flutter_tools/test/integration.shard/test_data/stateless_stateful_project.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 = 2.8
-
 import '../test_utils.dart';
 import 'project.dart';
 

packages/flutter_tools/test/integration.shard/test_data/stepping_project.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 = 2.8
-
 import 'project.dart';
 
 class SteppingProject extends Project {

packages/flutter_tools/test/integration.shard/test_data/test_project.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 = 2.8
-
 import 'project.dart';
 
 class TestProject extends Project {

packages/flutter_tools/test/integration.shard/test_data/tests_project.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 = 2.8
-
-
 import 'package:file/file.dart';
 import 'package:flutter_tools/src/base/file_system.dart';