[v9]: Replace custom Platform & PlatformChecker with package platform

dart/lib/src/platform/_web_platform.dart

@@ -1,8 +1,9 @@
+import 'package:platform/platform.dart';
 import 'package:web/web.dart' as web;
 
 import 'platform.dart';
 
 /// [Platform] implementation that delegates to `dart:web`.
 class PlatformBase {
   const PlatformBase();
 

dart/pubspec.yaml

@@ -26,6 +26,7 @@ dependencies:
   uuid: '>=3.0.0 <5.0.0'
   collection: ^1.16.0
   web: ^1.1.0
+  platform: ^3.1.6
 
 dev_dependencies:
   build_runner: ^2.3.0

dart/test/mocks/mock_platform.dart

@@ -0,0 +1,23 @@
+import 'package:platform/platform.dart';
+
+extension MockPlatform on FakePlatform {
+  static Platform android() {
+    return FakePlatform(operatingSystem: 'android');
+  }
+
+  static Platform iOS() {
+    return FakePlatform(operatingSystem: 'ios');
+  }
+
+  static Platform macOS() {
+    return FakePlatform(operatingSystem: 'macos');
+  }
+
+  static Platform linux() {
+    return FakePlatform(operatingSystem: 'linux');
+  }
+
+  static Platform windows() {
+    return FakePlatform(operatingSystem: 'windows');
+  }
+}

dart/test/mocks/mock_platform_checker.dart

@@ -0,0 +1,40 @@
+import 'package:platform/platform.dart';
+import 'package:sentry/src/platform_checker.dart';
+
+import 'no_such_method_provider.dart';
+
+class MockPlatformChecker extends PlatformChecker with NoSuchMethodProvider {
+  MockPlatformChecker({
+    this.isDebug = false,
+    this.isProfile = false,
+    this.isRelease = false,
+    this.isWebValue = false,
+    this.hasNativeIntegration = false,
+    Platform? platform,
+  }) : _platform = platform;
+
+  final Platform? _platform;
+
+  final bool isDebug;
+  final bool isProfile;
+  final bool isRelease;
+  final bool isWebValue;
+
+  @override
+  bool hasNativeIntegration = false;
+
+  @override
+  bool isDebugMode() => isDebug;
+
+  @override
+  bool isProfileMode() => isProfile;
+
+  @override
+  bool isReleaseMode() => isRelease;
+
+  @override
+  bool get isWeb => isWebValue;
+
+  @override
+  Platform get platform => _platform ?? super.platform;
+}

flutter/test/profiling_test.dart

@@ -21,6 +21,7 @@ void main() {
     Hub hubWithSampleRate(double profilesSampleRate) {
       final o = defaultTestOptions();
       o.platform = MockPlatform.iOS();
+
       o.profilesSampleRate = profilesSampleRate;
 
       final hub = MockHub();