WidgetsBinding.instance.window.frameData.frameNumber throws in tests #105530
Description
import 'package:flutter/widgets.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
testWidgets('frameData', (WidgetTester tester) async {
print(WidgetsBinding.instance.window.frameData.frameNumber);
});
}throws:
00:02 +0: frameData
══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
The following _TypeError was thrown running a test:
type 'Null' is not a subtype of type 'FrameData'
When the exception was thrown, this was the stack:
#0 TestWindow.frameData (dart:ui/window.dart:687:17)
#1 main.<anonymous closure> (file:///Users/dnfield/src/flutter/flutter.widgets/packages/visibility_detector/test/window_test.dart:6:42)
#2 testWidgets.<anonymous closure>.<anonymous closure> (package:flutter_test/src/widget_tester.dart:171:29)
<asynchronous suspension>
<asynchronous suspension>
(elided one frame from package:stack_trace)
The test description was:
frameData
════════════════════════════════════════════════════════════════════════════════════════════════════
00:02 +0 -1: frameData [E]
Test failed. See exception logs above.
The test description was: frameData
00:02 +0 -1: Some tests failed.