[flutter_test]scrollUntilVisible has different results if ListTile's onTap is null or not #143921
Description
Steps to reproduce
- Paste sample code to tests/xxx_test.dart in Flutter project
- Execute test by flutter test --plain-name 'scrollUntilVisible'
Expected results
The test passes, whether or not the ListTile's onTap attribute is null.
Actual results
The test will fail if ListTile's onTap attribute is not null.
Code sample
Code sample
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
// flutter test --plain-name 'scrollUntilVisible'
void main() {
group("scrollUntilVisible", () {
Future<void> pumpListViewAndScrollToEndContent(
WidgetTester tester, bool hasOnTap) async {
int itemCount = 30;
final controller = ScrollController();
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: ListView.builder(
controller: controller,
itemBuilder: (context, index) {
if (index <= itemCount) {
return ListTile(
onTap: hasOnTap
? () {
//debugPrint("tapped");
}
: null,
title: Text("$index"),
);
}
return null;
},
),
)));
// controller.addListener(() {
// debugPrint(
// "${controller.position.pixels}, ${controller.position.maxScrollExtent}");
// });
await tester.scrollUntilVisible(
find.text("${itemCount - 1}"),
20,
maxScrolls: 2000,
duration: const Duration(milliseconds: 50),
scrollable: find.byType(Scrollable),
);
}
testWidgets("This results success", (tester) async {
// ListTile has "onTap" as null
await pumpListViewAndScrollToEndContent(tester, false);
});
testWidgets("This results failed", (tester) async {
// ListTile has "onTap" as not null
await pumpListViewAndScrollToEndContent(tester, true);
});
});
}
Screenshots or Video
No response
Logs
Logs
% flutter test --plain-name 'scrollUntilVisible'
00:06 +1: /xxx/xxx.dart: scrollUntilVisible This results failed
══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
The following StateError was thrown running a test:
Bad state: No element
When the exception was thrown, this was the stack:
#0 Iterable.single (dart:core/iterable.dart:674:25)
#1 WidgetController.element (package:flutter_test/src/controller.dart:448:30)
#2 WidgetController.dragUntilVisible.<anonymous closure> (package:flutter_test/src/controller.dart:1709:38)
<asynchronous suspension>
#3 TestAsyncUtils.guard.<anonymous closure> (package:flutter_test/src/test_async_utils.dart:117:7)
<asynchronous suspension>
#4 WidgetController.scrollUntilVisible.<anonymous closure> (package:flutter_test/src/controller.dart:1675:7)
<asynchronous suspension>
#5 TestAsyncUtils.guard.<anonymous closure> (package:flutter_test/src/test_async_utils.dart:117:7)
<asynchronous suspension>
#6 main.<anonymous closure>.pumpListViewAndScrollToEndContent (/xxx/xxx_test.dart:36:7)
<asynchronous suspension>
#7 main.<anonymous closure>.<anonymous closure> (/xxx/xxx_test.dart:52:7)
<asynchronous suspension>
#8 testWidgets.<anonymous closure>.<anonymous closure> (package:flutter_test/src/widget_tester.dart:168:15)
<asynchronous suspension>
#9 TestWidgetsFlutterBinding._runTestBody (package:flutter_test/src/binding.dart:1013:5)
<asynchronous suspension>
<asynchronous suspension>
(elided one frame from package:stack_trace)Flutter Doctor output
I have not installed the Android environment, but it is not related to the test.
% flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.16.9, on macOS 14.1.1 23B81 darwin-arm64, locale ja-JP)
[✗] Android toolchain - develop for Android devices
✗ Unable to locate Android SDK.
Install Android Studio from: https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.dev/docs/get-started/install/macos#android-setup for detailed instructions).
If the Android SDK has been installed to a custom location, please use
`flutter config --android-sdk` to update to that location.
[✓] Xcode - develop for iOS and macOS (Xcode 15.0.1)
[✓] Chrome - develop for the web
[!] Android Studio (not installed)
[✓] VS Code (version 1.86.0)
[✓] Connected device (4 available)
[✓] Network resources
! Doctor found issues in 2 categories.