Revert "Assert that runApp is called in the same zone as binding.ensureInitialized (#117113)" (#122830)

Revert "Assert that runApp is called in the same zone as binding.ensureInitialized"

dev/tracing_tests/test/common.dart

@@ -5,9 +5,7 @@
 import 'dart:developer' as developer;
 import 'dart:isolate' as isolate;
 
-import 'package:flutter/foundation.dart';
 import 'package:flutter/scheduler.dart';
-import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:vm_service/vm_service.dart';
 import 'package:vm_service/vm_service_io.dart';
@@ -54,29 +52,3 @@ Future<void> runFrame(VoidCallback callback) {
   callback();
   return result;
 }
-
-// This binding skips the zones tests. These tests were written before we
-// verified zones properly, and they have been legacied-in to avoid having
-// to refactor them.
-//
-// When creating new tests, avoid relying on this class.
-class ZoneIgnoringTestBinding extends WidgetsFlutterBinding {
-  @override
-  void initInstances() {
-    super.initInstances();
-    _instance = this;
-  }
-
-  @override
-  bool debugCheckZone(String entryPoint) { return true; }
-
-  static ZoneIgnoringTestBinding get instance => BindingBase.checkInstance(_instance);
-  static ZoneIgnoringTestBinding? _instance;
-
-  static ZoneIgnoringTestBinding ensureInitialized() {
-    if (ZoneIgnoringTestBinding._instance == null) {
-      ZoneIgnoringTestBinding();
-    }
-    return ZoneIgnoringTestBinding.instance;
-  }
-}

dev/tracing_tests/test/image_painting_event_test.dart

@@ -13,8 +13,6 @@ import 'package:vm_service/vm_service.dart';
 import 'package:vm_service/vm_service_io.dart';
 
 void main() {
-  LiveTestWidgetsFlutterBinding.ensureInitialized();
-
   late VmService vmService;
   late LiveTestWidgetsFlutterBinding binding;
   setUpAll(() async {
@@ -29,7 +27,7 @@ void main() {
     await vmService.streamListen(EventStreams.kExtension);
 
     // Initialize bindings
-    binding = LiveTestWidgetsFlutterBinding.instance;
+    binding = LiveTestWidgetsFlutterBinding();
     binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.fullyLive;
     binding.attachRootWidget(const SizedBox.expand());
     expect(binding.framesEnabled, true);

dev/tracing_tests/test/inflate_widget_tracing_test.dart

@@ -16,7 +16,7 @@ final Set<String> interestingLabels = <String>{
 };
 
 void main() {
-  ZoneIgnoringTestBinding.ensureInitialized();
+  WidgetsFlutterBinding.ensureInitialized();
   initTimelineTests();
   test('Children of MultiChildRenderObjectElement show up in tracing', () async {
     // We don't have expectations around the first frame because there's a race around

dev/tracing_tests/test/inflate_widget_update_test.dart

@@ -9,7 +9,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'common.dart';
 
 void main() {
-  ZoneIgnoringTestBinding.ensureInitialized();
+  WidgetsFlutterBinding.ensureInitialized();
   initTimelineTests();
   test('Widgets with updated keys produce well formed timelines', () async {
     await runFrame(() { runApp(const TestRoot()); });

dev/tracing_tests/test/timeline_test.dart

@@ -58,7 +58,7 @@ class TestRootState extends State<TestRoot> {
 }
 
 void main() {
-  ZoneIgnoringTestBinding.ensureInitialized();
+  WidgetsFlutterBinding.ensureInitialized();
   initTimelineTests();
   test('Timeline', () async {
     // We don't have expectations around the first frame because there's a race around

packages/flutter/lib/src/foundation/binding.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 'dart:convert' show json;
 import 'dart:developer' as developer;
 import 'dart:io' show exit;
@@ -266,7 +265,6 @@ abstract class BindingBase {
     assert(_debugInitializedType == null);
     assert(() {
       _debugInitializedType = runtimeType;
-      _debugBindingZone = Zone.current;
       return true;
     }());
   }
@@ -321,7 +319,7 @@ abstract class BindingBase {
           ),
           ErrorHint(
             'It is also possible that $T does not implement "initInstances()" to assign a value to "instance". See the '
-            'documentation of the BindingBase class for more details.',
+            'documentation of the BaseBinding class for more details.',
           ),
           ErrorHint(
             'The binding that was initialized was of the type "$_debugInitializedType". '
@@ -401,95 +399,6 @@ abstract class BindingBase {
     return _debugInitializedType;
   }
 
-  Zone? _debugBindingZone;
-
-  /// Whether [debugCheckZone] should throw (true) or just report the error (false).
-  ///
-  /// Setting this to true makes it easier to catch cases where the zones are
-  /// misconfigured, by allowing debuggers to stop at the point of error.
-  ///
-  /// Currently this defaults to false, to avoid suddenly breaking applications
-  /// that are affected by this check but appear to be working today. Applications
-  /// are encouraged to resolve any issues that cause the [debugCheckZone] message
-  /// to appear, as even if they appear to be working today, they are likely to be
-  /// hiding hard-to-find bugs, and are more brittle (likely to collect bugs in
-  /// the future).
-  ///
-  /// To silence the message displayed by [debugCheckZone], ensure that the same
-  /// zone is used when calling `ensureInitialized()` as when calling the framework
-  /// in any other context (e.g. via [runApp]).
-  static bool debugZoneErrorsAreFatal = false;
-
-  /// Checks that the current [Zone] is the same as that which was used
-  /// to initialize the binding.
-  ///
-  /// If the current zone ([Zone.current]) is not the zone that was active when
-  /// the binding was initialized, then this method generates a [FlutterError]
-  /// exception with detailed information. The exception is either thrown
-  /// directly, or reported via [FlutterError.reportError], depending on the
-  /// value of [BindingBase.debugZoneErrorsAreFatal].
-  ///
-  /// To silence the message displayed by [debugCheckZone], ensure that the same
-  /// zone is used when calling `ensureInitialized()` as when calling the
-  /// framework in any other context (e.g. via [runApp]). For example, consider
-  /// keeping a reference to the zone used to initialize the binding, and using
-  /// [Zone.run] to use it again when calling into the framework.
-  ///
-  /// ## Usage
-  ///
-  /// The binding is considered initialized once [BindingBase.initInstances] has
-  /// run; if this is called before then, it will throw an [AssertionError].
-  ///
-  /// The `entryPoint` parameter is the name of the API that is checking the
-  /// zones are consistent, for example, `'runApp'`.
-  ///
-  /// This function always returns true (if it does not throw). It is expected
-  /// to be invoked via the binding instance, e.g.:
-  ///
-  /// ```dart
-  /// void startup() {
-  ///   WidgetsBinding binding = WidgetsFlutterBinding.ensureInitialized();
-  ///   assert(binding.debugCheckZone('startup'));
-  ///   // ...
-  /// }
-  /// ```
-  ///
-  /// If the binding expects to be used with multiple zones, it should override
-  /// this method to return true always without throwing. (For example, the
-  /// bindings used with [flutter_test] do this as they make heavy use of zones
-  /// to drive the framework with an artificial clock and to catch errors and
-  /// report them as test failures.)
-  bool debugCheckZone(String entryPoint) {
-    assert(() {
-      assert(_debugBindingZone != null, 'debugCheckZone can only be used after the binding is fully initialized.');
-      if (Zone.current != _debugBindingZone) {
-        final Error message = FlutterError(
-          'Zone mismatch.\n'
-          'The Flutter bindings were initialized in a different zone than is now being used. '
-          'This will likely cause confusion and bugs as any zone-specific configuration will '
-          'inconsistently use the configuration of the original binding initialization zone '
-          'or this zone based on hard-to-predict factors such as which zone was active when '
-          'a particular callback was set.\n'
-          'It is important to use the same zone when calling `ensureInitialized` on the binding '
-          'as when calling `$entryPoint` later.\n'
-          'To make this ${ debugZoneErrorsAreFatal ? 'error non-fatal' : 'warning fatal' }, '
-          'set BindingBase.debugZoneErrorsAreFatal to ${!debugZoneErrorsAreFatal} before the '
-          'bindings are initialized (i.e. as the first statement in `void main() { }`).',
-        );
-        if (debugZoneErrorsAreFatal) {
-          throw message;
-        }
-        FlutterError.reportError(FlutterErrorDetails(
-          exception: message,
-          stack: StackTrace.current,
-          context: ErrorDescription('during $entryPoint'),
-        ));
-      }
-      return true;
-    }());
-    return true;
-  }
-
   /// Called when the binding is initialized, to register service
   /// extensions.
   ///

packages/flutter/lib/src/widgets/binding.dart

@@ -1031,7 +1031,6 @@ mixin WidgetsBinding on BindingBase, ServicesBinding, SchedulerBinding, GestureB
 ///    ensure the widget, element, and render trees are all built.
 void runApp(Widget app) {
   final WidgetsBinding binding = WidgetsFlutterBinding.ensureInitialized();
-  assert(binding.debugCheckZone('runApp'));
   binding
     ..scheduleAttachRootWidget(binding.wrapWithDefaultView(app))
     ..scheduleWarmUpFrame();

packages/flutter/test/foundation/binding_2_test.dart

@@ -1,63 +0,0 @@
-// Copyright 2014 The Flutter Authors. All rights reserved.
-// 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:flutter/foundation.dart';
-import 'package:flutter_test/flutter_test.dart';
-
-class TestBinding extends BindingBase { }
-
-void main() {
-  test('BindingBase.debugCheckZone', () async {
-    final BindingBase binding = TestBinding();
-    binding.debugCheckZone('test1');
-    BindingBase.debugZoneErrorsAreFatal = true;
-    Zone.current.fork().run(() {
-      try {
-        binding.debugCheckZone('test2');
-        fail('expected an exception');
-      } catch (error) {
-        expect(error, isA<FlutterError>());
-        expect(error.toString(),
-          'Zone mismatch.\n'
-          'The Flutter bindings were initialized in a different zone than is now being used. '
-          'This will likely cause confusion and bugs as any zone-specific configuration will '
-          'inconsistently use the configuration of the original binding initialization zone '
-          'or this zone based on hard-to-predict factors such as which zone was active when '
-          'a particular callback was set.\n'
-          'It is important to use the same zone when calling `ensureInitialized` on the '
-          'binding as when calling `test2` later.\n'
-          'To make this error non-fatal, set BindingBase.debugZoneErrorsAreFatal to false '
-          'before the bindings are initialized (i.e. as the first statement in `void main() { }`).',
-        );
-      }
-    });
-    BindingBase.debugZoneErrorsAreFatal = false;
-    Zone.current.fork().run(() {
-      bool sawError = false;
-      final FlutterExceptionHandler? lastHandler = FlutterError.onError;
-      FlutterError.onError = (FlutterErrorDetails details) {
-        final Object error = details.exception;
-        expect(error, isA<FlutterError>());
-        expect(error.toString(),
-          'Zone mismatch.\n'
-          'The Flutter bindings were initialized in a different zone than is now being used. '
-          'This will likely cause confusion and bugs as any zone-specific configuration will '
-          'inconsistently use the configuration of the original binding initialization zone '
-          'or this zone based on hard-to-predict factors such as which zone was active when '
-          'a particular callback was set.\n'
-          'It is important to use the same zone when calling `ensureInitialized` on the '
-          'binding as when calling `test3` later.\n'
-          'To make this warning fatal, set BindingBase.debugZoneErrorsAreFatal to true '
-          'before the bindings are initialized (i.e. as the first statement in `void main() { }`).',
-        );
-        sawError = true;
-      };
-      binding.debugCheckZone('test3');
-      expect(sawError, isTrue);
-      FlutterError.onError = lastHandler;
-    });
-  });
-}

packages/flutter/test/foundation/binding_test.dart

@@ -27,6 +27,7 @@ class FooLibraryBinding extends BindingBase with FooBinding {
   }
 }
 
+
 void main() {
   test('BindingBase.debugBindingType', () async {
     expect(BindingBase.debugBindingType(), isNull);

packages/flutter/test/painting/binding_test.dart

@@ -47,9 +47,6 @@ class TestBindingBase implements BindingBase {
   @override
   void initInstances() {}
 
-  @override
-  bool debugCheckZone(String entryPoint) { return true; }
-
   @override
   void initServiceExtensions() {}
 

packages/flutter/test/widgets/run_app_async_test.dart

@@ -3,39 +3,12 @@
 // found in the LICENSE file.
 
 import 'package:fake_async/fake_async.dart';
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
-// This test is very fragile and bypasses some zone-related checks.
-// It is written this way to verify some invariants that would otherwise
-// be difficult to check.
-// Do not use this test as a guide for writing good Flutter code.
-
-class TestBinding extends WidgetsFlutterBinding {
-  @override
-  void initInstances() {
-    super.initInstances();
-    _instance = this;
-  }
-
-  @override
-  bool debugCheckZone(String entryPoint) { return true; }
-
-  static TestBinding get instance => BindingBase.checkInstance(_instance);
-  static TestBinding? _instance;
-
-  static TestBinding ensureInitialized() {
-    if (TestBinding._instance == null) {
-      TestBinding();
-    }
-    return TestBinding.instance;
-  }
-}
-
 void main() {
   setUp(() {
-    TestBinding.ensureInitialized();
+    WidgetsFlutterBinding.ensureInitialized();
     WidgetsBinding.instance.resetEpoch();
   });
 

packages/flutter_driver/lib/src/extension/extension.dart

@@ -39,11 +39,6 @@ class _DriverBinding extends BindingBase with SchedulerBinding, ServicesBinding,
   final List<FinderExtension>? finders;
   final List<CommandExtension>? commands;
 
-  // Because you can't really control which zone a driver test uses,
-  // we override the test for zones here.
-  @override
-  bool debugCheckZone(String entryPoint) { return true; }
-
   @override
   void initServiceExtensions() {
     super.initServiceExtensions();

packages/flutter_test/lib/src/binding.dart

@@ -369,13 +369,6 @@ abstract class TestWidgetsFlutterBinding extends BindingBase
     // doesn't get generated for tests.
   }
 
-  @override
-  bool debugCheckZone(String entryPoint) {
-    // We skip all the zone checks in tests because the test framework makes heavy use
-    // of zones and so the zones never quite match the way the framework expects.
-    return true;
-  }
-
   /// Whether there is currently a test executing.
   bool get inTest;
 
@@ -822,9 +815,9 @@ abstract class TestWidgetsFlutterBinding extends BindingBase
     };
     FlutterError.demangleStackTrace = (StackTrace stack) {
       // package:stack_trace uses ZoneSpecification.errorCallback to add useful
-      // information to stack traces, meaning Trace and Chain classes can be
+      // information to stack traces, in this case the Trace and Chain classes
-      // present. Because these StackTrace implementations do not follow the
+      // can be present. Because these StackTrace implementations do not follow
-      // format the framework expects, we convert them to a vm trace here.
+      // the format the framework expects, we covert them to a vm trace here.
       if (stack is stack_trace.Trace) {
         return stack.vmTrace;
       }

packages/flutter_test/test/live_widget_controller_test.dart

@@ -2,38 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:flutter_test/flutter_test.dart';
 
-// This test is very fragile and bypasses some zone-related checks.
-// It is written this way to verify some invariants that would otherwise
-// be difficult to check.
-// Do not use this test as a guide for writing good Flutter code.
-
-class TestBinding extends WidgetsFlutterBinding {
-  @override
-  void initInstances() {
-    super.initInstances();
-    _instance = this;
-  }
-
-  @override
-  bool debugCheckZone(String entryPoint) { return true; }
-
-  static TestBinding get instance => BindingBase.checkInstance(_instance);
-  static TestBinding? _instance;
-
-  static TestBinding ensureInitialized() {
-    if (TestBinding._instance == null) {
-      TestBinding();
-    }
-    return TestBinding.instance;
-  }
-}
-
 class CountButton extends StatefulWidget {
   const CountButton({super.key});
 
@@ -92,8 +65,6 @@ class _AnimateSampleState extends State<AnimateSample>
 }
 
 void main() {
-  TestBinding.ensureInitialized();
-
   test('Test pump on LiveWidgetController', () async {
     runApp(const MaterialApp(home: Center(child: CountButton())));
 
@@ -138,7 +109,7 @@ void main() {
     final List<PointerEventRecord> records = <PointerEventRecord>[
       PointerEventRecord(Duration.zero, <PointerEvent>[
         // Typically PointerAddedEvent is not used in testers, but for records
-        // captured on a device it is usually what starts a gesture.
+        // captured on a device it is usually what start a gesture.
         PointerAddedEvent(
           position: location,
         ),