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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
void main() {
testWidgetsWithLeakTracking('debugCheckHasMaterial control test', (WidgetTester tester) async {
await tester.pumpWidget(const Center(child: Chip(label: Text('label'))));
final dynamic exception = tester.takeException();
expect(exception, isFlutterError);
final FlutterError error = exception as FlutterError;
expect(error.diagnostics.length, 5);
expect(error.diagnostics[2].level, DiagnosticLevel.hint);
expect(
error.diagnostics[2].toStringDeep(),
equalsIgnoringHashCodes(
'To introduce a Material widget, you can either directly include\n'
'one, or use a widget that contains Material itself, such as a\n'
'Card, Dialog, Drawer, or Scaffold.\n',
),
);
expect(error.diagnostics[3], isA<DiagnosticsProperty<Element>>());
expect(error.diagnostics[4], isA<DiagnosticsBlock>());
expect(
error.toStringDeep(), startsWith(
'FlutterError\n'
' No Material widget found.\n'
' Chip widgets require a Material widget ancestor within the\n'
' closest LookupBoundary.\n'
' In Material Design, most widgets are conceptually "printed" on a\n'
" sheet of material. In Flutter's material library, that material\n"
' is represented by the Material widget. It is the Material widget\n'
' that renders ink splashes, for instance. Because of this, many\n'
' material library widgets require that there be a Material widget\n'
' in the tree above them.\n'
' To introduce a Material widget, you can either directly include\n'
' one, or use a widget that contains Material itself, such as a\n'
' Card, Dialog, Drawer, or Scaffold.\n'
' The specific widget that could not find a Material ancestor was:\n'
' Chip\n'
' The ancestors of this widget were:\n'
' Center\n'
// End of ancestor chain omitted, not relevant for test.
));
});
testWidgetsWithLeakTracking('debugCheckHasMaterialLocalizations control test', (WidgetTester tester) async {
await tester.pumpWidget(const Center(child: BackButton()));
final dynamic exception = tester.takeException();
expect(exception, isFlutterError);
final FlutterError error = exception as FlutterError;
expect(error.diagnostics.length, 6);
expect(error.diagnostics[3].level, DiagnosticLevel.hint);
expect(
error.diagnostics[3].toStringDeep(),
equalsIgnoringHashCodes(
'To introduce a MaterialLocalizations, either use a MaterialApp at\n'
'the root of your application to include them automatically, or\n'
'add a Localization widget with a MaterialLocalizations delegate.\n',
),
);
expect(error.diagnostics[4], isA<DiagnosticsProperty<Element>>());
expect(error.diagnostics[5], isA<DiagnosticsBlock>());
expect(
error.toStringDeep(), startsWith(
'FlutterError\n'
' No MaterialLocalizations found.\n'
' BackButton widgets require MaterialLocalizations to be provided\n'
' by a Localizations widget ancestor.\n'
' The material library uses Localizations to generate messages,\n'
' labels, and abbreviations.\n'
' To introduce a MaterialLocalizations, either use a MaterialApp at\n'
' the root of your application to include them automatically, or\n'
' add a Localization widget with a MaterialLocalizations delegate.\n'
' The specific widget that could not find a MaterialLocalizations\n'
' ancestor was:\n'
' BackButton\n'
' The ancestors of this widget were:\n'
' Center\n'
// End of ancestor chain omitted, not relevant for test.
));
});
testWidgetsWithLeakTracking('debugCheckHasScaffold control test', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
theme: ThemeData(
pageTransitionsTheme: const PageTransitionsTheme(
builders: <TargetPlatform, PageTransitionsBuilder>{
TargetPlatform.android: FadeUpwardsPageTransitionsBuilder(),
},
),
),
home: Builder(
builder: (BuildContext context) {
showBottomSheet<void>(
context: context,
builder: (BuildContext context) => Container(),
);
return Container();
},
),
),
);
final dynamic exception = tester.takeException();
expect(exception, isFlutterError);
final FlutterError error = exception as FlutterError;
expect(error.diagnostics.length, 5);
expect(error.diagnostics[2], isA<DiagnosticsProperty<Element>>());
expect(error.diagnostics[3], isA<DiagnosticsBlock>());
expect(error.diagnostics[4].level, DiagnosticLevel.hint);
expect(
error.diagnostics[4].toStringDeep(),
equalsIgnoringHashCodes(
'Typically, the Scaffold widget is introduced by the MaterialApp\n'
'or WidgetsApp widget at the top of your application widget tree.\n',
),
);
expect(error.toStringDeep(), startsWith(
'FlutterError\n'
' No Scaffold widget found.\n'
' Builder widgets require a Scaffold widget ancestor.\n'
' The specific widget that could not find a Scaffold ancestor was:\n'
' Builder\n'
' The ancestors of this widget were:\n'
' Semantics\n'
' Builder\n'
));
expect(error.toStringDeep(), endsWith(
' [root]\n'
' Typically, the Scaffold widget is introduced by the MaterialApp\n'
' or WidgetsApp widget at the top of your application widget tree.\n'
));
});
testWidgets('debugCheckHasScaffoldMessenger control test', (WidgetTester tester) async {
final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();
final GlobalKey<ScaffoldMessengerState> scaffoldMessengerKey = GlobalKey<ScaffoldMessengerState>();
final SnackBar snackBar = SnackBar(
content: const Text('Snack'),
action: SnackBarAction(label: 'Test', onPressed: () {}),
);
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: ScaffoldMessenger(
key: scaffoldMessengerKey,
child: Builder(
builder: (BuildContext context) {
return Scaffold(
key: scaffoldKey,
body: Container(),
);
},
),
),
));
final List<dynamic> exceptions = <dynamic>[];
final FlutterExceptionHandler? oldHandler = FlutterError.onError;
FlutterError.onError = (FlutterErrorDetails details) {
exceptions.add(details.exception);
};
// ScaffoldMessenger shows SnackBar.
scaffoldMessengerKey.currentState!.showSnackBar(snackBar);
await tester.pumpAndSettle();
// Pump widget to rebuild without ScaffoldMessenger
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: Scaffold(
key: scaffoldKey,
body: Container(),
),
));
// Tap SnackBarAction to dismiss.
// The SnackBarAction should assert we still have an ancestor
// ScaffoldMessenger in order to dismiss the SnackBar from the
// Scaffold.
await tester.tap(find.text('Test'));
FlutterError.onError = oldHandler;
expect(exceptions.length, 1);
// ignore: avoid_dynamic_calls
expect(exceptions.single.runtimeType, FlutterError);
final FlutterError error = exceptions.first as FlutterError;
expect(error.diagnostics.length, 5);
expect(error.diagnostics[2], isA<DiagnosticsProperty<Element>>());
expect(error.diagnostics[3], isA<DiagnosticsBlock>());
expect(error.diagnostics[4].level, DiagnosticLevel.hint);
expect(
error.diagnostics[4].toStringDeep(),
equalsIgnoringHashCodes(
'Typically, the ScaffoldMessenger widget is introduced by the\n'
'MaterialApp at the top of your application widget tree.\n',
),
);
expect(error.toStringDeep(), startsWith(
'FlutterError\n'
' No ScaffoldMessenger widget found.\n'
' SnackBarAction widgets require a ScaffoldMessenger widget\n'
' ancestor.\n'
' The specific widget that could not find a ScaffoldMessenger\n'
' ancestor was:\n'
' SnackBarAction\n'
' The ancestors of this widget were:\n'
' TextButtonTheme\n'
' Padding\n'
' Row\n'
));
expect(error.toStringDeep(), endsWith(
' [root]\n'
' Typically, the ScaffoldMessenger widget is introduced by the\n'
' MaterialApp at the top of your application widget tree.\n'
));
});
}