I have the following elements encapsulated into a single ListView
in my material app:
home: Scaffold(
appBar: AppBar(title: const Text("Flutter Layout")),
body: ListView(children: [
fibonacciSection,
// a ListView supports app body scrolling when the app is run on a small device.
Image.asset("images/lake.jpg",
width: 600,
height: 240,
fit: BoxFit
.cover), // BoxFit.cover tells the framework that the image should be as small as possible but cover its entire render box.
titleSection,
buttonsSection,
textSection,
statesSection
])));
And when I run the unit tests which contain the following code snippet:
await tester.pumpWidget(const MyApp(key: Key("StateManagemetTests")));
final listFinder = find.byType(Scrollable);
final itemFinder = find.byType(TapboxB);
// Scroll until the item to be found appears.
await tester.scrollUntilVisible(
itemFinder,
500.0,
scrollable: listFinder,
);
It throws the following exception:
══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
The following StateError was thrown running a test:
Bad state: Too many elements
When the exception was thrown, this was the stack:
#0 Iterable.single (dart:core/iterable.dart:656:24)
#1 WidgetController.widget (package:flutter_test/src/controller.dart:69:30)
#2 WidgetController.scrollUntilVisible.<anonymous closure> (package:flutter_test/src/controller.dart:1190:15)
#3 WidgetController.scrollUntilVisible.<anonymous closure> (package:flutter_test/src/controller.dart:1188:39)
#6 TestAsyncUtils.guard (package:flutter_test/src/test_async_utils.dart:71:41)
#7 WidgetController.scrollUntilVisible (package:flutter_test/src/controller.dart:1188:27)
#8 main.<anonymous closure> (file:///usr/src/flutter/flutter_app_layout/test/widget_test.dart:50:18)
<asynchronous suspension>
<asynchronous suspension>
(elided 3 frames from dart:async and package:stack_trace)
Any advice and insight is appreciated!
CodePudding user response:
Replacing scrollUntilVisible()
with dragUntilVisible()
solves the problem!
I don't find anything at all for scrollUntilVisible()
. Is that an outdated API which should be removed from the framework?