fixed `dart analyze --fatal-infos` for cipd (#5152) Fixed `dart analyze --fatal-infos` for cipd after flutter update

diff --git a/cipd_packages/device_doctor/lib/src/health.dart b/cipd_packages/device_doctor/lib/src/health.dart
index 1b65880..704b6a5 100644
--- a/cipd_packages/device_doctor/lib/src/health.dart
+++ b/cipd_packages/device_doctor/lib/src/health.dart

@@ -17,7 +17,7 @@
 Future<HealthCheckResult> closeIosDialog({
   ProcessManager pm = const LocalProcessManager(),
   String? deviceId,
-  platform.Platform pl = const platform.LocalPlatform(),
+  platform.Platform pl = const platform.Platform(),
   String infraDialog = 'infra-dialog',
 }) async {
   var dialogDir = dir(path.dirname(Platform.script.path), 'tool', infraDialog);
@@ -36,15 +36,12 @@
     // By default the above command relies on automatic code signing, while on devicelab machines
     // it should utilize manual code signing as that is more stable. Below overwrites the code
     // signing config if one exists in the environment.
-    if (pl.environment['FLUTTER_XCODE_CODE_SIGN_STYLE'] != null) {
+    final env = pl.nativePlatform?.environment;
+    if (env != null && env['FLUTTER_XCODE_CODE_SIGN_STYLE'] != null) {
+      command.add("CODE_SIGN_STYLE=${env['FLUTTER_XCODE_CODE_SIGN_STYLE']}");
+      command.add("DEVELOPMENT_TEAM=${env['FLUTTER_XCODE_DEVELOPMENT_TEAM']}");
       command.add(
-        "CODE_SIGN_STYLE=${pl.environment['FLUTTER_XCODE_CODE_SIGN_STYLE']}",
-      );
-      command.add(
-        "DEVELOPMENT_TEAM=${pl.environment['FLUTTER_XCODE_DEVELOPMENT_TEAM']}",
-      );
-      command.add(
-        "PROVISIONING_PROFILE_SPECIFIER=${pl.environment['FLUTTER_XCODE_PROVISIONING_PROFILE_SPECIFIER']}",
+        "PROVISIONING_PROFILE_SPECIFIER=${env['FLUTTER_XCODE_PROVISIONING_PROFILE_SPECIFIER']}",
       );
     }
     final proc = await pm.start(command, workingDirectory: dialogDir.path);

diff --git a/cipd_packages/device_doctor/lib/src/ios_debug_symbol_doctor.dart b/cipd_packages/device_doctor/lib/src/ios_debug_symbol_doctor.dart
index fff64d3..280b4f7 100644
--- a/cipd_packages/device_doctor/lib/src/ios_debug_symbol_doctor.dart
+++ b/cipd_packages/device_doctor/lib/src/ios_debug_symbol_doctor.dart

@@ -64,7 +64,7 @@
     this.processManager = const LocalProcessManager(),
     Logger? loggerOverride,
     this.fs = const LocalFileSystem(),
-    this.platform = const LocalPlatform(),
+    this.platform = const Platform(),
   }) : logger = loggerOverride ?? Logger.root {
     argParser
       ..addOption(
@@ -197,7 +197,7 @@
   /// Xcode will regenerate this folder and symbols for connected devices
   /// when Xcode is opened.
   void _deleteSymbols() {
-    final home = platform.environment['HOME'];
+    final home = platform.nativePlatform?.environment['HOME'];
     if (home == null) {
       logger.warning('\$HOME path was not found');
       return;

diff --git a/cipd_packages/device_doctor/test/src/health_test.dart b/cipd_packages/device_doctor/test/src/health_test.dart
index 50954ee..9495be2 100644
--- a/cipd_packages/device_doctor/test/src/health_test.dart
+++ b/cipd_packages/device_doctor/test/src/health_test.dart

@@ -8,6 +8,7 @@
 import 'package:device_doctor/src/utils.dart';
 import 'package:mockito/mockito.dart';
 import 'package:platform/platform.dart' as platform;
+import 'package:platform/testing.dart';
 import 'package:test/test.dart';
 
 import 'utils.dart';
@@ -36,7 +37,7 @@
       when(
         pm.start(any, workingDirectory: anyNamed('workingDirectory')),
       ).thenAnswer((_) => Future.value(proc));
-      final platform.Platform pl = platform.FakePlatform(
+      final platform.Platform pl = TestPlatform.native(
         environment: <String, String>{
           'FLUTTER_XCODE_CODE_SIGN_STYLE': 'Manual',
           'FLUTTER_XCODE_DEVELOPMENT_TEAM': 'S8QB4VV633',

diff --git a/cipd_packages/device_doctor/test/src/ios_debug_symbol_doctor_test.dart b/cipd_packages/device_doctor/test/src/ios_debug_symbol_doctor_test.dart
index 4c91f65..4387ec3 100644
--- a/cipd_packages/device_doctor/test/src/ios_debug_symbol_doctor_test.dart
+++ b/cipd_packages/device_doctor/test/src/ios_debug_symbol_doctor_test.dart

@@ -11,7 +11,7 @@
 import 'package:file/memory.dart';
 import 'package:logging/logging.dart';
 import 'package:mockito/mockito.dart';
-import 'package:platform/platform.dart';
+import 'package:platform/testing.dart';
 
 import 'package:test/test.dart';
 
@@ -102,8 +102,9 @@
       logger = TestLogger();
       fs = MemoryFileSystem();
       fs.directory(xcworkspacePath).createSync(recursive: true);
-      platform = MockPlatform();
-      platform.environment['HOME'] = '/User/username';
+      platform = TestPlatform.native(
+        environment: <String, String>{'HOME': '/User/username'},
+      );
     });
 
     test('diagnose logs output of xcdevice list', () async {

diff --git a/cipd_packages/device_doctor/test/src/utils.dart b/cipd_packages/device_doctor/test/src/utils.dart
index d308810..4d15aeb 100644
--- a/cipd_packages/device_doctor/test/src/utils.dart
+++ b/cipd_packages/device_doctor/test/src/utils.dart

@@ -8,14 +8,8 @@
 
 import 'package:logging/logging.dart';
 import 'package:mockito/mockito.dart';
-import 'package:platform/platform.dart';
 import 'package:process/process.dart';
 
-class MockPlatform extends Mock implements Platform {
-  @override
-  Map<String, String> environment = <String, String>{};
-}
-
 class MockProcessManager extends Mock implements ProcessManager {
   @override
   Future<Process> start(