我已使用Future.delayed
使用以下代码在1秒内显示FAB:
Future.delayed(const Duration(seconds: 1), () {
setState(() {
_showFab = true;
});
});
现在最基本的烟雾测试已停止工作:
void main() {
testWidgets('smoke test', (WidgetTester tester) async {
await tester.pumpWidget(MyApp());
expect(find.byType(MyHomePage), findsOneWidget);
});
}
这是错误消息:
══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
The following assertion was thrown running a test:
A Timer is still pending even after the widget tree was disposed.
'package:flutter_test/src/binding.dart': Failed assertion: line 933 pos 7:
'_currentFakeAsync.nonPeriodicTimerCount == 0' import 'dart:async';
这里是所有使用的代码:
import 'package:flutter/material.dart';
import 'dart:async';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key}) : super(key: key);
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
bool _showFab = false;
@override
Widget build(BuildContext context) {
Future.delayed(const Duration(seconds: 1), () {
setState(() {
_showFab = true;
});
});
return Scaffold(
floatingActionButton: AnimatedOpacity(
opacity: _showFab ? 1.0 : 0.0,
duration: Duration(milliseconds: 1400),
child: FloatingActionButton(
onPressed: null,
child: Icon(Icons.add),
),
),
);
}
}
如何更改单元测试以使测试通过?
答案 0 :(得分:2)
您需要给测试人员足够的时间来处理您计划的所有异步调用,尝试将冒烟测试更改为以下内容:
void main() {
testWidgets('smoke test', (WidgetTester tester) async {
await tester.pumpWidget(MyApp());
// Since you wait 1 second to start the animation and another 1.4 to complete it
await tester.pump(Duration(seconds: 3));
expect(find.byType(MyHomePage), findsOneWidget);
});
}
您还需要将Future.delayed
从build()
方法中移出,因为这会导致循环行为,每次调用setState()
时都会调用build()
再次,像这样更改您的状态:
class MyHomePage extends StatefulWidget {
MyHomePage({Key key}) : super(key: key);
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
bool _showFab = false;
@override
void initState() {
Future.delayed(const Duration(seconds: 1), () {
setState(() {
_showFab = true;
});
});
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
floatingActionButton: AnimatedOpacity(
opacity: _showFab ? 1.0 : 0.0,
duration: Duration(milliseconds: 1400),
child: FloatingActionButton(
onPressed: null,
child: Icon(Icons.add),
),
),
);
}
}
答案 1 :(得分:2)
默认情况下,测试框架与FakeAsync
一起运行,这有一些限制,可能会导致您得到错误。
您可以显式地使用适当的异步方式运行:
void main() {
testWidgets('smoke test', (WidgetTester tester) async {
await tester.runAsync(() async {
await tester.pumpWidget(MyApp());
expect(find.byType(MyHomePage), findsOneWidget);
});
});
}
您可能仍需要其他答案中的建议。
答案 2 :(得分:2)
您可以用TickerMode包装小部件。
如下所示:
void main() {
testWidgets('smoke test', (WidgetTester tester) async {
await tester.pumpWidget(TickerMode(child: MyApp(), enabled: false));
await tester.pumpAndSettle();
expect(find.byType(MyHomePage), findsOneWidget);
});
}
答案 3 :(得分:0)
抽出窗口小部件后,尝试致电pumpAndSettle。像这样:
void main() {
testWidgets('smoke test', (WidgetTester tester) async {
await tester.pumpWidget(MyApp());
await tester.pumpAndSettle();
expect(find.byType(MyHomePage), findsOneWidget);
});
}
来自文档
这实际上等待所有动画完成。
答案 4 :(得分:0)
我尝试使用pump
和pumpAndSettle
,但是没有用。但是在Duration
中添加pumpAndSettle
(不适用于pump
)会使它再次工作
await tester.pumpAndSettle(Duration(seconds: 1));