ticker_provider_test.dart 2.49 KB
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// Copyright 2015 The Chromium 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_test/flutter_test.dart';
import 'package:flutter/material.dart';

void main() {
  testWidgets('TickerMode', (WidgetTester tester) async {
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    const Widget widget = TickerMode(
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      enabled: false,
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      child: CircularProgressIndicator(),
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    );
    expect(widget.toString, isNot(throwsException));

    await tester.pumpWidget(widget);
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    expect(tester.binding.transientCallbackCount, 0);

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    await tester.pumpWidget(const TickerMode(
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      enabled: true,
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      child: CircularProgressIndicator(),
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    ));

    expect(tester.binding.transientCallbackCount, 1);

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    await tester.pumpWidget(const TickerMode(
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      enabled: false,
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      child: CircularProgressIndicator(),
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    ));

    expect(tester.binding.transientCallbackCount, 0);
  });

  testWidgets('Navigation with TickerMode', (WidgetTester tester) async {
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    await tester.pumpWidget(MaterialApp(
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      home: const LinearProgressIndicator(),
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      routes: <String, WidgetBuilder>{
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        '/test': (BuildContext context) => const Text('hello'),
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      },
    ));
    expect(tester.binding.transientCallbackCount, 1);
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    tester.state<NavigatorState>(find.byType(Navigator)).pushNamed('/test');
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    expect(tester.binding.transientCallbackCount, 2);
    await tester.pump();
    expect(tester.binding.transientCallbackCount, 2);
    await tester.pump(const Duration(seconds: 5));
    expect(tester.binding.transientCallbackCount, 0);
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    tester.state<NavigatorState>(find.byType(Navigator)).pop();
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    expect(tester.binding.transientCallbackCount, 1);
    await tester.pump();
    expect(tester.binding.transientCallbackCount, 2);
    await tester.pump(const Duration(seconds: 5));
    expect(tester.binding.transientCallbackCount, 1);
  });
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  testWidgets('SingleTickerProviderStateMixin can handle not being used', (WidgetTester tester) async {
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    final Widget widget = BoringTickerTest();
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    expect(widget.toString, isNot(throwsException));

    await tester.pumpWidget(widget);
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    await tester.pumpWidget(Container());
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    // the test is that this doesn't crash, like it used to...
  });
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}
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class BoringTickerTest extends StatefulWidget {
  @override
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  _BoringTickerTestState createState() => _BoringTickerTestState();
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}

class _BoringTickerTestState extends State<BoringTickerTest> with SingleTickerProviderStateMixin {
  @override
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  Widget build(BuildContext context) => Container();
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}