Enable private field promotion for flutter_tools (#134474)

New feature in upcoming Dart 3.2. See https://github.com/dart-lang/language/issues/2020. Feature is enabled by bumping the min SDK version to 3.2.

Part of https://github.com/flutter/flutter/issues/134476.

packages/flutter_tools/lib/src/android/android_device_discovery.dart

@@ -105,8 +105,8 @@ class AndroidDevices extends PollingDeviceDiscovery {
 
   bool _doesNotHaveAdb() {
     return _androidSdk == null ||
-      _androidSdk?.adbPath == null ||
-      !_processManager.canRun(_androidSdk!.adbPath);
+      _androidSdk.adbPath == null ||
+      !_processManager.canRun(_androidSdk.adbPath);
   }
 
   // 015d172c98400a03       device usb:340787200X product:nakasi model:Nexus_7 device:grouper

packages/flutter_tools/lib/src/android/android_emulator.dart

@@ -141,7 +141,7 @@ class AndroidEmulator extends Emulator {
   @override
   PlatformType get platformType => PlatformType.android;
 
-  String? _prop(String name) => _properties != null ? _properties![name] : null;
+  String? _prop(String name) => _properties != null ? _properties[name] : null;
 
   @override
   Future<void> launch({@visibleForTesting Duration? startupDuration, bool coldBoot = false}) async {

packages/flutter_tools/lib/src/android/android_workflow.dart

@@ -53,12 +53,12 @@ class AndroidWorkflow implements Workflow {
 
   @override
   bool get canListDevices => appliesToHostPlatform && _androidSdk != null
-    && _androidSdk?.adbPath != null;
+    && _androidSdk.adbPath != null;
 
   @override
   bool get canLaunchDevices => appliesToHostPlatform && _androidSdk != null
-    && _androidSdk?.adbPath != null
-    && (_androidSdk?.validateSdkWellFormed().isEmpty ?? false);
+    && _androidSdk.adbPath != null
+    && _androidSdk.validateSdkWellFormed().isEmpty;
 
   @override
   bool get canListEmulators => canListDevices && _androidSdk?.emulatorPath != null;
@@ -105,13 +105,13 @@ class AndroidValidator extends DoctorValidator {
         return false;
       }
       messages.add(ValidationMessage(_userMessages.androidJdkLocation(_java!.binaryPath)));
-      if (!_java!.canRun()) {
-        messages.add(ValidationMessage.error(_userMessages.androidCantRunJavaBinary(_java!.binaryPath)));
+      if (!_java.canRun()) {
+        messages.add(ValidationMessage.error(_userMessages.androidCantRunJavaBinary(_java.binaryPath)));
         return false;
       }
       Version? javaVersion;
       try {
-        javaVersion = _java!.version;
+        javaVersion = _java.version;
       } on Exception catch (error) {
         _logger.printTrace(error.toString());
       }
@@ -253,13 +253,13 @@ class AndroidLicenseValidator extends DoctorValidator {
     final List<ValidationMessage> messages = <ValidationMessage>[];
 
     // Match pre-existing early termination behavior
-    if (_androidSdk == null || _androidSdk?.latestVersion == null ||
-        _androidSdk!.validateSdkWellFormed().isNotEmpty ||
+    if (_androidSdk == null || _androidSdk.latestVersion == null ||
+        _androidSdk.validateSdkWellFormed().isNotEmpty ||
         ! await _checkJavaVersionNoOutput()) {
       return ValidationResult(ValidationType.missing, messages);
     }
 
-    final String sdkVersionText = _userMessages.androidStatusInfo(_androidSdk!.latestVersion!.buildToolsVersionName);
+    final String sdkVersionText = _userMessages.androidStatusInfo(_androidSdk.latestVersion!.buildToolsVersionName);
 
     // Check for licenses.
     switch (await licensesAccepted) {
@@ -371,7 +371,7 @@ class AndroidLicenseValidator extends DoctorValidator {
 
     try {
       final Process process = await _processManager.start(
-        <String>[_androidSdk!.sdkManagerPath!, '--licenses'],
+        <String>[_androidSdk.sdkManagerPath!, '--licenses'],
         environment: _java?.environment,
       );
 
@@ -404,7 +404,7 @@ class AndroidLicenseValidator extends DoctorValidator {
       final int exitCode = await process.exitCode;
       if (exitCode != 0) {
         throwToolExit(_userMessages.androidCannotRunSdkManager(
-          _androidSdk?.sdkManagerPath ?? '',
+          _androidSdk.sdkManagerPath ?? '',
           'exited code $exitCode',
           _platform,
         ));
@@ -412,7 +412,7 @@ class AndroidLicenseValidator extends DoctorValidator {
       return true;
     } on ProcessException catch (e) {
       throwToolExit(_userMessages.androidCannotRunSdkManager(
-        _androidSdk?.sdkManagerPath ?? '',
+        _androidSdk.sdkManagerPath ?? '',
         e.toString(),
         _platform,
       ));

packages/flutter_tools/lib/src/android/migrations/android_studio_java_gradle_conflict_migration.dart

@@ -91,10 +91,10 @@ class AndroidStudioJavaGradleConflictMigration extends ProjectMigrator {
         return;
       }
 
-      if (_androidStudio == null || _androidStudio!.version == null) {
+      if (_androidStudio == null || _androidStudio.version == null) {
         logger.printTrace(androidStudioNotFound);
         return;
-      } else if (_androidStudio!.version!.major < androidStudioFlamingo.major) {
+      } else if (_androidStudio.version!.major < androidStudioFlamingo.major) {
         logger.printTrace(androidStudioVersionBelowFlamingo);
         return;
       }

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

@@ -116,7 +116,7 @@ class AppContext {
   T? get<T>() {
     dynamic value = _generateIfNecessary(T, _overrides);
     if (value == null && _parent != null) {
-      value = _parent!.get<T>();
+      value = _parent.get<T>();
     }
     return _unboxNull(value ?? _generateIfNecessary(T, _fallbacks)) as T?;
   }

packages/flutter_tools/lib/src/cache.dart

@@ -558,7 +558,7 @@ class Cache {
   /// Return the top-level directory in the cache; this is `bin/cache`.
   Directory getRoot() {
     if (_rootOverride != null) {
-      return _fileSystem.directory(_fileSystem.path.join(_rootOverride!.path, 'bin', 'cache'));
+      return _fileSystem.directory(_fileSystem.path.join(_rootOverride.path, 'bin', 'cache'));
     } else {
       return _fileSystem.directory(_fileSystem.path.join(flutterRoot!, 'bin', 'cache'));
     }

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

@@ -277,7 +277,7 @@ known, it can be explicitly provided to attach via the command-line, e.g.
             logger: _logger,
           ),
           notifyingLogger: (_logger is NotifyingLogger)
-            ? _logger as NotifyingLogger
+            ? _logger
             : NotifyingLogger(verbose: _logger.isVerbose, parent: _logger),
           logToStdout: true,
         )

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

@@ -1753,7 +1753,7 @@ Directory createTemporaryFlutterSdk(
     // Fill in SDK dependency constraint.
     output.write('''
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
 ''');
 
     output.writeln('dependencies:');
@@ -1785,7 +1785,7 @@ description: Dart SDK extensions for dart:ui
 homepage: http://flutter.io
 # sky_engine requires sdk_ext support in the analyzer which was added in 1.11.x
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
 ''');
 
   return directory;

packages/flutter_tools/lib/src/device.dart

@@ -393,7 +393,7 @@ class DeviceDiscoverySupportFilter {
     if (_flutterProject == null) {
       return true;
     }
-    return device.isSupportedForProject(_flutterProject!);
+    return device.isSupportedForProject(_flutterProject);
   }
 }
 

packages/flutter_tools/lib/src/ios/application_package.dart

@@ -141,7 +141,7 @@ class BuildableIOSApp extends IOSApp {
   // not a top-level output directory.
   // Specifying `build/ios/archive/Runner` will result in `build/ios/archive/Runner.xcarchive`.
   String get archiveBundlePath => globals.fs.path.join(getIosBuildDirectory(), 'archive',
-      _hostAppBundleName == null ? 'Runner' : globals.fs.path.withoutExtension(_hostAppBundleName!));
+      _hostAppBundleName == null ? 'Runner' : globals.fs.path.withoutExtension(_hostAppBundleName));
 
   // The output xcarchive bundle path `build/ios/archive/Runner.xcarchive`.
   String get archiveBundleOutputPath =>
@@ -150,7 +150,7 @@ class BuildableIOSApp extends IOSApp {
   String get builtInfoPlistPathAfterArchive => globals.fs.path.join(archiveBundleOutputPath,
       'Products',
       'Applications',
-      _hostAppBundleName == null ? 'Runner.app' : _hostAppBundleName!,
+      _hostAppBundleName ?? 'Runner.app',
       'Info.plist');
 
   String get projectAppIconDirName => _projectImageAssetDirName(_appIconAsset);

packages/flutter_tools/lib/src/resident_devtools_handler.dart

@@ -79,19 +79,19 @@ class FlutterResidentDevtoolsHandler implements ResidentDevtoolsHandler {
       return;
     }
     if (devToolsServerAddress != null) {
-      _devToolsLauncher!.devToolsUrl = devToolsServerAddress;
+      _devToolsLauncher.devToolsUrl = devToolsServerAddress;
     } else {
-      await _devToolsLauncher!.serve();
+      await _devToolsLauncher.serve();
       _served = true;
     }
-    await _devToolsLauncher!.ready;
+    await _devToolsLauncher.ready;
     // Do not attempt to print debugger list if the connection has failed or if we're shutting down.
-    if (_devToolsLauncher!.activeDevToolsServer == null || _shutdown) {
+    if (_devToolsLauncher.activeDevToolsServer == null || _shutdown) {
       assert(!_readyToAnnounce);
       return;
     }
 
-    final Uri? devToolsUrl = _devToolsLauncher!.devToolsUrl;
+    final Uri? devToolsUrl = _devToolsLauncher.devToolsUrl;
     if (devToolsUrl != null) {
       for (final FlutterDevice? device in flutterDevices) {
         if (device == null) {
@@ -130,7 +130,7 @@ class FlutterResidentDevtoolsHandler implements ResidentDevtoolsHandler {
     }
 
     _readyToAnnounce = true;
-    assert(_devToolsLauncher!.activeDevToolsServer != null);
+    assert(_devToolsLauncher.activeDevToolsServer != null);
     if (_residentRunner.reportedDebuggers) {
       // Since the DevTools only just became available, we haven't had a chance to
       // report their URLs yet. Do so now.
@@ -148,9 +148,9 @@ class FlutterResidentDevtoolsHandler implements ResidentDevtoolsHandler {
     if (!_residentRunner.supportsServiceProtocol || _devToolsLauncher == null) {
       return false;
     }
-    if (_devToolsLauncher!.devToolsUrl == null) {
+    if (_devToolsLauncher.devToolsUrl == null) {
       _logger.startProgress('Waiting for Flutter DevTools to be served...');
-      unawaited(_devToolsLauncher!.ready.then((_) {
+      unawaited(_devToolsLauncher.ready.then((_) {
         _launchDevToolsForDevices(flutterDevices);
       }));
     } else {
@@ -294,7 +294,7 @@ class FlutterResidentDevtoolsHandler implements ResidentDevtoolsHandler {
     }
     _shutdown = true;
     _readyToAnnounce = false;
-    await _devToolsLauncher!.close();
+    await _devToolsLauncher.close();
   }
 }
 

packages/flutter_tools/lib/src/resident_runner.dart

@@ -1690,7 +1690,7 @@ class TerminalHandler {
       _addSignalHandler(io.ProcessSignal.sigusr2, _handleSignal);
       if (_pidFile != null) {
         _logger.printTrace('Writing pid to: $_pidFile');
-        _actualPidFile = _processInfo.writePidFile(_pidFile!);
+        _actualPidFile = _processInfo.writePidFile(_pidFile);
       }
     }
   }

packages/flutter_tools/lib/src/windows/visual_studio.dart

@@ -81,7 +81,7 @@ class VisualStudio {
     if (_bestVisualStudioDetails == null) {
       return false;
     }
-    return _bestVisualStudioDetails!.isComplete ?? true;
+    return _bestVisualStudioDetails.isComplete ?? true;
   }
 
   /// True if Visual Studio is launchable.
@@ -91,7 +91,7 @@ class VisualStudio {
     if (_bestVisualStudioDetails == null) {
       return false;
     }
-    return _bestVisualStudioDetails!.isLaunchable ?? true;
+    return _bestVisualStudioDetails.isLaunchable ?? true;
   }
 
   /// True if the Visual Studio installation is a pre-release version.

packages/flutter_tools/pubspec.yaml

@@ -3,7 +3,7 @@ description: Tools for building Flutter applications
 homepage: https://flutter.dev
 
 environment:
-  sdk: '>=3.0.0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".

packages/flutter_tools/test/commands.shard/hermetic/analyze_continuously_test.dart

@@ -60,7 +60,7 @@ void main() {
     pubspecFile.writeAsStringSync('''
   name: foo_project
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
   ''');
 
     final File dartFile = fileSystem.file(fileSystem.path.join(directory.path, 'lib', 'main.dart'));

packages/flutter_tools/test/commands.shard/hermetic/generate_localizations_test.dart

@@ -427,7 +427,7 @@ format: true
     pubspecFile.writeAsStringSync('''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:
@@ -466,7 +466,7 @@ format: true
     pubspecFile.writeAsStringSync('''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:

packages/flutter_tools/test/commands.shard/hermetic/update_packages_test.dart

@@ -23,7 +23,7 @@ description: A framework for writing Flutter applications
 homepage: http://flutter.dev
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
@@ -60,7 +60,7 @@ homepage: http://flutter.dev
 version: 1.0.0
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
   flutter: ">=2.5.0-6.0.pre.30 <3.0.0"
 
 dependencies:

packages/flutter_tools/test/data/asset_test/font/pubspec.yaml

@@ -2,7 +2,7 @@ name: font
 description: A test project that contains a font.
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
 
 flutter:
   uses-material-design: true

packages/flutter_tools/test/data/asset_test/main/pubspec.yaml

@@ -2,7 +2,7 @@ name: main
 description: A test project that has a package with a font as a dependency.
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
 
 dependencies:
   font:

packages/flutter_tools/test/general.shard/build_system/build_system_test.dart

@@ -701,7 +701,7 @@ class TestTarget extends Target {
   @override
   bool canSkip(Environment environment) {
     if (_canSkip != null) {
-      return _canSkip!(environment);
+      return _canSkip(environment);
     }
     return super.canSkip(environment);
   }

packages/flutter_tools/test/general.shard/build_system/targets/dart_plugin_registrant_test.dart

@@ -86,7 +86,7 @@ flutter:
         pluginClass: none
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
   flutter: ">=1.20.0"
 ''';
 

packages/flutter_tools/test/general.shard/test/test_compiler_test.dart

@@ -166,7 +166,7 @@ flutter:
       linux:
         dartPluginClass: APlugin
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
   flutter: ">=2.5.0"
 ''');
 

packages/flutter_tools/test/general.shard/update_packages_test.dart

@@ -17,7 +17,7 @@ description: A framework for writing Flutter applications
 homepage: http://flutter.dev
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
@@ -51,7 +51,7 @@ description: A dummy pubspec with no dependencies
 homepage: http://flutter.dev
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
 ''';
 
 const String kInvalidGitPubspec = '''
@@ -60,7 +60,7 @@ description: A framework for writing Flutter applications
 homepage: http://flutter.dev
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".

packages/flutter_tools/test/integration.shard/analyze_once_test.dart

@@ -481,7 +481,7 @@ class _MyHomePageState extends State<MyHomePage> {
 const String pubspecYamlSrc = r'''
 name: flutter_project
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
 
 dependencies:
   flutter:

packages/flutter_tools/test/integration.shard/break_on_framework_exceptions_test.dart

@@ -637,7 +637,7 @@ class TestProject extends Project {
   final String pubspec = '''
     name: test
     environment:
-      sdk: '>=3.0.0-0 <4.0.0'
+      sdk: '>=3.2.0-0 <4.0.0'
 
     dependencies:
       flutter:

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

@@ -12,7 +12,7 @@ class BackgroundProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:
@@ -63,7 +63,7 @@ class RepeatingBackgroundProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:

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

@@ -10,7 +10,7 @@ class BasicProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:
@@ -63,7 +63,7 @@ class BasicProjectThatThrows extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:
@@ -120,7 +120,7 @@ class BasicProjectWithTimelineTraces extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:
@@ -169,7 +169,7 @@ class BasicProjectWithFlutterGen extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:
@@ -194,7 +194,7 @@ class BasicProjectWithUnaryMain extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
   dependencies:
     flutter:
       sdk: flutter

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

@@ -10,7 +10,7 @@ class CompileErrorProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:

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

@@ -13,7 +13,7 @@ class DeferredComponentsProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:

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

@@ -34,7 +34,7 @@ class GenL10nProject extends Project {
   final String pubspec = '''
 name: test_l10n_project
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
 
 dependencies:
   flutter:

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

@@ -10,7 +10,7 @@ class HotReloadConstProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:

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

@@ -12,7 +12,7 @@ class HotReloadProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:

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

@@ -10,7 +10,7 @@ class HotReloadWithAssetProject extends Project {
   final String pubspec = '''
 name: test
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
 
 dependencies:
   flutter:

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

@@ -14,7 +14,7 @@ class IntegrationTestsProject extends Project implements TestsProject {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:

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

@@ -175,7 +175,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=3.2.0-0 <4.0.0'
 
 dependencies:
   flutter:

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

@@ -38,7 +38,7 @@ class MultidexProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:

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

@@ -10,7 +10,7 @@ class ProjectWithEarlyError extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:

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

@@ -10,7 +10,7 @@ class HotReloadProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:

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

@@ -9,7 +9,7 @@ class SteppingProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
   dependencies:
     flutter:
       sdk: flutter
@@ -65,7 +65,7 @@ class WebSteppingProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
   dependencies:
     flutter:
       sdk: flutter

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

@@ -10,7 +10,7 @@ class TestProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:

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

@@ -13,7 +13,7 @@ class TestsProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=3.0.0-0 <4.0.0'
+    sdk: '>=3.2.0-0 <4.0.0'
 
   dependencies:
     flutter:

packages/flutter_tools/test/src/fake_http_client.dart

@@ -341,7 +341,7 @@ class _FakeHttpClientRequest implements HttpClientRequest {
     });
     await completer.future;
     if (_responseError != null) {
-      return Future<HttpClientResponse>.error(_responseError!);
+      return Future<HttpClientResponse>.error(_responseError);
     }
     return _FakeHttpClientResponse(_response);
   }

packages/flutter_tools/test/src/fake_process_manager.dart

@@ -401,7 +401,7 @@ abstract class FakeProcessManager implements ProcessManager {
       return false;
     }
     if (fakeProcess._completer != null) {
-      fakeProcess._completer!.complete();
+      fakeProcess._completer.complete();
     }
     return true;
   }

packages/flutter_tools/test/src/io.dart

@@ -27,7 +27,7 @@ class FlutterIOOverrides extends io.IOOverrides {
     if (_fileSystemDelegate == null) {
       return super.createDirectory(path);
     }
-    return _fileSystemDelegate!.directory(path);
+    return _fileSystemDelegate.directory(path);
   }
 
   @override
@@ -35,7 +35,7 @@ class FlutterIOOverrides extends io.IOOverrides {
     if (_fileSystemDelegate == null) {
       return super.createFile(path);
     }
-    return _fileSystemDelegate!.file(path);
+    return _fileSystemDelegate.file(path);
   }
 
   @override
@@ -43,7 +43,7 @@ class FlutterIOOverrides extends io.IOOverrides {
     if (_fileSystemDelegate == null) {
       return super.createLink(path);
     }
-    return _fileSystemDelegate!.link(path);
+    return _fileSystemDelegate.link(path);
   }
 
   @override
@@ -51,7 +51,7 @@ class FlutterIOOverrides extends io.IOOverrides {
     if (_fileSystemDelegate == null) {
       return super.fsWatch(path, events, recursive);
     }
-    return _fileSystemDelegate!.file(path).watch(events: events, recursive: recursive);
+    return _fileSystemDelegate.file(path).watch(events: events, recursive: recursive);
   }
 
   @override
@@ -59,7 +59,7 @@ class FlutterIOOverrides extends io.IOOverrides {
     if (_fileSystemDelegate == null) {
       return super.fsWatchIsSupported();
     }
-    return _fileSystemDelegate!.isWatchSupported;
+    return _fileSystemDelegate.isWatchSupported;
   }
 
   @override
@@ -67,7 +67,7 @@ class FlutterIOOverrides extends io.IOOverrides {
     if (_fileSystemDelegate == null) {
       return super.fseGetType(path, followLinks);
     }
-    return _fileSystemDelegate!.type(path, followLinks: followLinks);
+    return _fileSystemDelegate.type(path, followLinks: followLinks);
   }
 
   @override
@@ -75,7 +75,7 @@ class FlutterIOOverrides extends io.IOOverrides {
     if (_fileSystemDelegate == null) {
       return super.fseGetTypeSync(path, followLinks);
     }
-    return _fileSystemDelegate!.typeSync(path, followLinks: followLinks);
+    return _fileSystemDelegate.typeSync(path, followLinks: followLinks);
   }
 
   @override
@@ -83,7 +83,7 @@ class FlutterIOOverrides extends io.IOOverrides {
     if (_fileSystemDelegate == null) {
       return super.fseIdentical(path1, path2);
     }
-    return _fileSystemDelegate!.identical(path1, path2);
+    return _fileSystemDelegate.identical(path1, path2);
   }
 
   @override
@@ -91,7 +91,7 @@ class FlutterIOOverrides extends io.IOOverrides {
     if (_fileSystemDelegate == null) {
       return super.fseIdenticalSync(path1, path2);
     }
-    return _fileSystemDelegate!.identicalSync(path1, path2);
+    return _fileSystemDelegate.identicalSync(path1, path2);
   }
 
   @override
@@ -99,7 +99,7 @@ class FlutterIOOverrides extends io.IOOverrides {
     if (_fileSystemDelegate == null) {
       return super.getCurrentDirectory();
     }
-    return _fileSystemDelegate!.currentDirectory;
+    return _fileSystemDelegate.currentDirectory;
   }
 
   @override
@@ -107,7 +107,7 @@ class FlutterIOOverrides extends io.IOOverrides {
     if (_fileSystemDelegate == null) {
       return super.getSystemTempDirectory();
     }
-    return _fileSystemDelegate!.systemTempDirectory;
+    return _fileSystemDelegate.systemTempDirectory;
   }
 
   @override
@@ -115,7 +115,7 @@ class FlutterIOOverrides extends io.IOOverrides {
     if (_fileSystemDelegate == null) {
       return super.setCurrentDirectory(path);
     }
-    _fileSystemDelegate!.currentDirectory = path;
+    _fileSystemDelegate.currentDirectory = path;
   }
 
   @override
@@ -123,7 +123,7 @@ class FlutterIOOverrides extends io.IOOverrides {
     if (_fileSystemDelegate == null) {
       return super.stat(path);
     }
-    return _fileSystemDelegate!.stat(path);
+    return _fileSystemDelegate.stat(path);
   }
 
   @override
@@ -131,6 +131,6 @@ class FlutterIOOverrides extends io.IOOverrides {
     if (_fileSystemDelegate == null) {
       return super.statSync(path);
     }
-    return _fileSystemDelegate!.statSync(path);
+    return _fileSystemDelegate.statSync(path);
   }
 }

packages/flutter_tools/test/src/test_build_system.dart

@@ -34,13 +34,13 @@ class TestBuildSystem implements BuildSystem {
   @override
   Future<BuildResult> build(Target target, Environment environment, {BuildSystemConfig buildSystemConfig = const BuildSystemConfig()}) async {
     if (_onRun != null) {
-      _onRun?.call(target, environment);
+      _onRun.call(target, environment);
     }
     if (_exception != null) {
-      throw _exception!;
+      throw _exception;
     }
     if (_singleResult != null) {
-      return _singleResult!;
+      return _singleResult;
     }
     if (_nextResult >= _results.length) {
       throw StateError('Unexpected build request of ${target.name}');
@@ -51,13 +51,13 @@ class TestBuildSystem implements BuildSystem {
   @override
   Future<BuildResult> buildIncremental(Target target, Environment environment, BuildResult? previousBuild) async {
     if (_onRun != null) {
-      _onRun?.call(target, environment);
+      _onRun.call(target, environment);
     }
     if (_exception != null) {
-      throw _exception!;
+      throw _exception;
     }
     if (_singleResult != null) {
-      return _singleResult!;
+      return _singleResult;
     }
     if (_nextResult >= _results.length) {
       throw StateError('Unexpected buildIncremental request of ${target.name}');

packages/flutter_tools/test/src/testbed.dart

@@ -126,7 +126,7 @@ class Testbed {
           body: () async {
             Cache.flutterRoot = '';
             if (_setup != null) {
-              await _setup?.call();
+              await _setup.call();
             }
             await test();
             Cache.flutterRoot = originalFlutterRoot;