Update additionalTime in TestWidgetsFlutterBinding.runAsync() to 1000. (#27256)

packages/flutter_test/lib/src/binding.dart

@@ -222,7 +222,7 @@ abstract class TestWidgetsFlutterBinding extends BindingBase
   /// current timeout. See [AutomatedTestWidgetsFlutterBinding.addTime] for
   /// details. The value is ignored by the [LiveTestWidgetsFlutterBinding].
   Future<T> runAsync<T>(Future<T> callback(), {
-    Duration additionalTime = const Duration(milliseconds: 250),
+    Duration additionalTime = const Duration(milliseconds: 1000),
   });
 
   /// Artificially calls dispatchLocalesChanged on the Widget binding,
@@ -720,7 +720,7 @@ class AutomatedTestWidgetsFlutterBinding extends TestWidgetsFlutterBinding {
 
   @override
   Future<T> runAsync<T>(Future<T> callback(), {
-    Duration additionalTime = const Duration(milliseconds: 250),
+    Duration additionalTime = const Duration(milliseconds: 1000),
   }) {
     assert(additionalTime != null);
     assert(() {
@@ -1223,7 +1223,7 @@ class LiveTestWidgetsFlutterBinding extends TestWidgetsFlutterBinding {
 
   @override
   Future<T> runAsync<T>(Future<T> callback(), {
-    Duration additionalTime = const Duration(milliseconds: 250),
+    Duration additionalTime = const Duration(milliseconds: 1000),
   }) async {
     assert(() {
       if (!_runningAsyncTasks)

packages/flutter_test/lib/src/widget_tester.dart

@@ -375,7 +375,7 @@ class WidgetTester extends WidgetController implements HitTestDispatcher, Ticker
   /// this method again. Attempts to do otherwise will result in a
   /// [TestFailure] error being thrown.
   Future<T> runAsync<T>(Future<T> callback(), {
-    Duration additionalTime = const Duration(milliseconds: 250),
+    Duration additionalTime = const Duration(milliseconds: 1000),
   }) => binding.runAsync<T>(callback, additionalTime: additionalTime);
 
   /// Whether there are any any transient callbacks scheduled.