Migrate some flutter_tools tests to null safety (#88850)

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

@@ -187,7 +187,7 @@ Future<Map<String, String>?> getCodeSigningIdentityDevelopmentTeam({
   final String opensslOutput = await utf8.decodeStream(opensslProcess.stdout);
   // Fire and forget discard of the stderr stream so we don't hold onto resources.
   // Don't care about the result.
-  unawaited(opensslProcess.stderr.drain<String>());
+  unawaited(opensslProcess.stderr.drain<String?>());
 
   if (await opensslProcess.exitCode != 0) {
     return null;

packages/flutter_tools/test/general.shard/base/error_handling_io_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 = 2.8
-
 import 'dart:io' as io; // flutter_ignore: dart_io_import;
 
 import 'package:file/file.dart';
@@ -103,7 +101,7 @@ void main() {
     const int kUserPermissionDenied = 5;
     const int kFatalDeviceHardwareError =  483;
 
-    FileExceptionHandler exceptionHandler;
+    late FileExceptionHandler exceptionHandler;
 
     setUp(() {
       exceptionHandler = FileExceptionHandler();
@@ -340,7 +338,7 @@ void main() {
 
     testWithoutContext('When reading from a file or directory without permission', () {
        final ErrorHandlingFileSystem fileSystem = ErrorHandlingFileSystem(
-        delegate: ThrowsOnCurrentDirectoryFileSystem()..errorCode = kUserPermissionDenied,
+        delegate: ThrowsOnCurrentDirectoryFileSystem(kUserPermissionDenied),
         platform: windowsPlatform,
       );
 
@@ -354,7 +352,7 @@ void main() {
     const int enospc = 28;
     const int eacces = 13;
 
-    FileExceptionHandler exceptionHandler;
+    late FileExceptionHandler exceptionHandler;
 
     setUp(() {
       exceptionHandler = FileExceptionHandler();
@@ -531,7 +529,7 @@ void main() {
 
     testWithoutContext('When the current working directory disappears', () async {
      final ErrorHandlingFileSystem fileSystem = ErrorHandlingFileSystem(
-        delegate: ThrowsOnCurrentDirectoryFileSystem()..errorCode = kSystemCannotFindFile,
+        delegate: ThrowsOnCurrentDirectoryFileSystem(kSystemCannotFindFile),
         platform: linuxPlatform,
       );
 
@@ -560,7 +558,7 @@ void main() {
     const int eperm = 1;
     const int enospc = 28;
     const int eacces = 13;
-    FileExceptionHandler exceptionHandler;
+    late FileExceptionHandler exceptionHandler;
 
     setUp(() {
       exceptionHandler = FileExceptionHandler();
@@ -754,7 +752,7 @@ void main() {
 
     testWithoutContext('When reading from current directory without permission', () {
      final ErrorHandlingFileSystem fileSystem = ErrorHandlingFileSystem(
-        delegate: ThrowsOnCurrentDirectoryFileSystem()..errorCode = eacces,
+        delegate: ThrowsOnCurrentDirectoryFileSystem(eacces),
         platform: linuxPlatform,
       );
 
@@ -781,11 +779,9 @@ void main() {
     );
 
     final Object firstPath = fs.path;
+    expect(firstPath, isNotNull);
 
     fs.currentDirectory = null;
-    // For fs.path.absolute usage.
-    fileSystem.path = MemoryFileSystem.test().path;
-
     expect(identical(firstPath, fs.path), false);
   });
 
@@ -1089,8 +1085,8 @@ void main() {
 
   group('CopySync' , () {
     const int eaccess = 13;
-    FileExceptionHandler exceptionHandler;
-    ErrorHandlingFileSystem fileSystem;
+    late FileExceptionHandler exceptionHandler;
+    late ErrorHandlingFileSystem fileSystem;
 
     setUp(() {
       exceptionHandler = FileExceptionHandler();
@@ -1191,20 +1187,22 @@ class ThrowingFakeProcessManager extends Fake implements ProcessManager {
   final Exception _exception;
 
   @override
-  bool canRun(dynamic executable, {String workingDirectory}) {
+  bool canRun(dynamic executable, {String? workingDirectory}) {
     throw _exception;
   }
 }
 
 class ThrowsOnCurrentDirectoryFileSystem extends Fake implements FileSystem {
-  int errorCode;
+  ThrowsOnCurrentDirectoryFileSystem(this.errorCode);
+
+  final int errorCode;
 
   @override
   Directory get currentDirectory => throw FileSystemException('', '', OSError('', errorCode));
 }
 
 class FakeExistsFile extends Fake implements File {
-  Object error;
+  late Object error;
   int existsCount = 0;
 
 
@@ -1225,10 +1223,7 @@ class FakeExistsFile extends Fake implements File {
 
 class FakeFileSystem extends Fake implements FileSystem {
   @override
-  p.Context path;
-
-  @override
-  Directory get currentDirectory => null;
+  p.Context get path => p.Context();
 
   @override
   set currentDirectory(dynamic path) { }

packages/flutter_tools/test/general.shard/base/process_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 = 2.8
-
 import 'package:flutter_tools/src/base/io.dart';
 import 'package:flutter_tools/src/base/logger.dart';
 import 'package:flutter_tools/src/base/platform.dart';
@@ -16,8 +14,8 @@ import '../../src/fakes.dart';
 
 void main() {
   group('process exceptions', () {
-    FakeProcessManager fakeProcessManager;
-    ProcessUtils processUtils;
+    late FakeProcessManager fakeProcessManager;
+    late ProcessUtils processUtils;
 
     setUp(() {
       fakeProcessManager = FakeProcessManager.empty();
@@ -42,7 +40,7 @@ void main() {
   group('shutdownHooks', () {
     testWithoutContext('runInExpectedOrder', () async {
       int i = 1;
-      int cleanup;
+      int? cleanup;
 
       final ShutdownHooks shutdownHooks = ShutdownHooks(logger: BufferLogger.test());
 
@@ -57,9 +55,9 @@ void main() {
   });
 
   group('output formatting', () {
-    FakeProcessManager processManager;
-    ProcessUtils processUtils;
-    BufferLogger logger;
+    late FakeProcessManager processManager;
+    late ProcessUtils processUtils;
+    late BufferLogger logger;
 
     setUp(() {
       processManager = FakeProcessManager.empty();
@@ -104,8 +102,8 @@ void main() {
   });
 
   group('run', () {
-    FakeProcessManager fakeProcessManager;
-    ProcessUtils processUtils;
+    late FakeProcessManager fakeProcessManager;
+    late ProcessUtils processUtils;
 
     setUp(() {
       fakeProcessManager = FakeProcessManager.empty();
@@ -180,9 +178,9 @@ void main() {
   });
 
   group('runSync', () {
-    FakeProcessManager fakeProcessManager;
-    ProcessUtils processUtils;
-    BufferLogger testLogger;
+    late FakeProcessManager fakeProcessManager;
+    late ProcessUtils processUtils;
+    late BufferLogger testLogger;
 
     setUp(() {
       fakeProcessManager = FakeProcessManager.empty();
@@ -331,8 +329,8 @@ void main() {
   });
 
   group('exitsHappySync', () {
-    FakeProcessManager processManager;
-    ProcessUtils processUtils;
+    late FakeProcessManager processManager;
+    late ProcessUtils processUtils;
 
     setUp(() {
       processManager = FakeProcessManager.empty();
@@ -388,8 +386,8 @@ void main() {
   });
 
   group('exitsHappy', () {
-    FakeProcessManager processManager;
-    ProcessUtils processUtils;
+    late FakeProcessManager processManager;
+    late ProcessUtils processUtils;
 
     setUp(() {
       processManager = FakeProcessManager.empty();

packages/flutter_tools/test/general.shard/build_system/invalidated_reason_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 = 2.8
-
 import 'package:flutter_tools/src/build_system/build_system.dart';
 
 import '../../src/common.dart';

packages/flutter_tools/test/general.shard/commands/flutter_root_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 = 2.8
-
 import 'package:file/memory.dart';
 import 'package:flutter_tools/src/base/file_system.dart';
 import 'package:flutter_tools/src/base/platform.dart';

packages/flutter_tools/test/general.shard/custom_devices/custom_devices_config_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 = 2.8
-
 import 'package:file/memory.dart';
 import 'package:flutter_tools/src/base/file_system.dart';
 import 'package:flutter_tools/src/base/logger.dart';

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

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-
 import 'dart:async';
 
 import 'package:file/memory.dart';

packages/flutter_tools/test/general.shard/ios/code_signing_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 = 2.8
-
 import 'dart:async';
 import 'dart:convert';
 
@@ -25,9 +23,9 @@ const String kCertificates = '''
 
 void main() {
   group('Auto signing', () {
-    Config testConfig;
-    AnsiTerminal testTerminal;
-    BufferLogger logger;
+    late Config testConfig;
+    late AnsiTerminal testTerminal;
+    late BufferLogger logger;
 
     setUp(() async {
       logger = BufferLogger.test();
@@ -37,7 +35,7 @@ void main() {
     });
 
     testWithoutContext('No auto-sign if Xcode project settings are not available', () async {
-      final Map<String, String> signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
+      final Map<String, String>? signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
         buildSettings: null,
         processManager: FakeProcessManager.empty(),
         logger: logger,
@@ -48,7 +46,7 @@ void main() {
     });
 
     testWithoutContext('No discovery if development team specified in Xcode project', () async {
-      final Map<String, String> signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
+      final Map<String, String>? signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
         buildSettings: <String, String>{
           'DEVELOPMENT_TEAM': 'abc',
         },
@@ -71,7 +69,7 @@ void main() {
         ),
       ]);
 
-      final Map<String, String> signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
+      final Map<String, String>? signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
         buildSettings: <String, String>{
           'bogus': 'bogus',
         },
@@ -135,13 +133,13 @@ void main() {
       ]);
 
       // Verify that certifacte value is passed into openssl command.
-      String stdin;
+      String? stdin;
       controller.stream.listen((List<int> chunk) {
         stdin = utf8.decode(chunk);
         completer.complete();
       });
 
-      final Map<String, String> signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
+      final Map<String, String>? signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
         buildSettings: <String, String>{
           'bogus': 'bogus',
         },
@@ -187,13 +185,13 @@ void main() {
       ]);
 
       // Verify that certifacte value is passed into openssl command.
-      String stdin;
+      String? stdin;
       controller.stream.listen((List<int> chunk) {
         stdin = utf8.decode(chunk);
         completer.complete();
       });
 
-      final Map<String, String> signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
+      final Map<String, String>? signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
         buildSettings: <String, String>{
           'bogus': 'bogus',
         },
@@ -237,13 +235,13 @@ void main() {
       ]);
 
       // Verify that certifacte value is passed into openssl command.
-      String stdin;
+      String? stdin;
       controller.stream.listen((List<int> chunk) {
         stdin = utf8.decode(chunk);
         completer.complete();
       });
 
-      final Map<String, String> signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
+      final Map<String, String>? signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
         buildSettings: <String, String>{
           'bogus': 'bogus',
         },
@@ -295,13 +293,13 @@ void main() {
       ]);
 
       // Verify that certifacte value is passed into openssl command.
-      String stdin;
+      String? stdin;
       controller.stream.listen((List<int> chunk) {
         stdin = utf8.decode(chunk);
         completer.complete();
       });
 
-      final Map<String, String> signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
+      final Map<String, String>? signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
         buildSettings: <String, String>{
           'bogus': 'bogus',
         },
@@ -348,13 +346,13 @@ void main() {
       ]);
 
       // Verify that certifacte value is passed into openssl command.
-      String stdin;
+      String? stdin;
       controller.stream.listen((List<int> chunk) {
         stdin = utf8.decode(chunk);
         completer.complete();
       });
 
-      final Map<String, String> signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
+      final Map<String, String>? signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
         buildSettings: <String, String>{
           'bogus': 'bogus',
         },
@@ -406,13 +404,13 @@ void main() {
       ]);
 
       // Verify that certifacte value is passed into openssl command.
-      String stdin;
+      String? stdin;
       controller.stream.listen((List<int> chunk) {
         stdin = utf8.decode(chunk);
         completer.complete();
       });
 
-      final Map<String, String> signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
+      final Map<String, String>? signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
         buildSettings: <String, String>{
           'bogus': 'bogus',
         },
@@ -449,7 +447,7 @@ void main() {
         ),
       ]);
 
-      final Map<String, String> signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
+      final Map<String, String>? signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
         buildSettings: <String, String>{
           'bogus': 'bogus',
         },
@@ -481,7 +479,7 @@ void main() {
         ),
       ]);
 
-      final Map<String, String> signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
+      final Map<String, String>? signingConfigs = await getCodeSigningIdentityDevelopmentTeam(
         buildSettings: <String, String>{
           'bogus': 'bogus',
         },
@@ -495,7 +493,7 @@ void main() {
   });
 }
 
-Stream<String> mockTerminalStdInStream;
+late Stream<String> mockTerminalStdInStream;
 
 class TestTerminal extends AnsiTerminal {
   TestTerminal() : super(stdio: globals.stdio, platform: globals.platform);

packages/flutter_tools/test/general.shard/macos/macos_workflow_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 = 2.8
-
 import 'package:flutter_tools/src/base/platform.dart';
 import 'package:flutter_tools/src/macos/macos_workflow.dart';
 

packages/flutter_tools/test/general.shard/windows/plugins_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 = 2.8
-
 import 'package:file/file.dart';
 import 'package:file/memory.dart';
 import 'package:file_testing/file_testing.dart';

packages/flutter_tools/test/general.shard/windows/project_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 = 2.8
-
 import 'package:file/file.dart';
 import 'package:file/memory.dart';
 import 'package:flutter_tools/src/project.dart';

packages/flutter_tools/test/src/custom_devices_common.dart

@@ -2,15 +2,13 @@
 // 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:flutter_tools/src/base/file_system.dart';
 import 'package:flutter_tools/src/convert.dart';
 import 'package:flutter_tools/src/custom_devices/custom_device_config.dart';
 
 void writeCustomDevicesConfigFile(
   Directory dir, {
-  List<CustomDeviceConfig> configs,
+  List<CustomDeviceConfig>? configs,
   dynamic json
 }) {
   dir.createSync(recursive: true);