flex_test.dart 4.18 KB
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// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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import 'package:flutter_test/flutter_test.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter/widgets.dart';
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void main() {
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  testWidgets('Can hit test flex children of stacks', (WidgetTester tester) async {
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    bool didReceiveTap = false;
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    await tester.pumpWidget(
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      Directionality(
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        textDirection: TextDirection.ltr,
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        child: Container(
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          color: const Color(0xFF00FF00),
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          child: Stack(
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            children: <Widget>[
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              Positioned(
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                top: 10.0,
                left: 10.0,
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                child: Column(
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                  children: <Widget>[
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                    GestureDetector(
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                      onTap: () {
                        didReceiveTap = true;
                      },
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                      child: Container(
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                        color: const Color(0xFF0000FF),
                        width: 100.0,
                        height: 100.0,
                        child: const Center(
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                          child: Text('X', textDirection: TextDirection.ltr),
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                        ),
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                      ),
                    ),
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                  ],
                ),
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              ),
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            ],
          ),
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        ),
      ),
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    );
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    await tester.tap(find.text('X'));
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    expect(didReceiveTap, isTrue);
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  });
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  testWidgets('Flexible defaults to loose', (WidgetTester tester) async {
    await tester.pumpWidget(
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      Row(
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        textDirection: TextDirection.ltr,
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        children: const <Widget>[
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          Flexible(child: SizedBox(width: 100.0, height: 200.0)),
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        ],
      ),
    );

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    final RenderBox box = tester.renderObject(find.byType(SizedBox));
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    expect(box.size.width, 100.0);
  });

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  testWidgets('Can pass null for flex', (WidgetTester tester) async {
    await tester.pumpWidget(
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      Row(
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        textDirection: TextDirection.ltr,
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        children: const <Widget>[
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          Expanded(flex: null, child: Text('one', textDirection: TextDirection.ltr)),
          Flexible(flex: null, child: Text('two', textDirection: TextDirection.ltr)),
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        ],
      ),
    );
  });
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  testWidgets("Doesn't overflow because of floating point accumulated error", (WidgetTester tester) async {
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    // both of these cases have failed in the past due to floating point issues
    await tester.pumpWidget(
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      Center(
        child: Container(
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          height: 400.0,
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          child: Column(
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            children: <Widget>[
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              Expanded(child: Container()),
              Expanded(child: Container()),
              Expanded(child: Container()),
              Expanded(child: Container()),
              Expanded(child: Container()),
              Expanded(child: Container()),
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            ],
          ),
        ),
      ),
    );
    await tester.pumpWidget(
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      Center(
        child: Container(
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          height: 199.0,
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          child: Column(
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            children: <Widget>[
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              Expanded(child: Container()),
              Expanded(child: Container()),
              Expanded(child: Container()),
              Expanded(child: Container()),
              Expanded(child: Container()),
              Expanded(child: Container()),
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            ],
          ),
        ),
      ),
    );
  });
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  testWidgets('Error information is printed correctly', (WidgetTester tester) async {
    // We run this twice, the first time without an error, so that the second time
    // we only get a single exception. Otherwise we'd get two, the one we want and
    // an extra one when we discover we never computed a size.
    await tester.pumpWidget(
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      Column(
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        children: <Widget>[
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          Column(),
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        ],
      ),
      Duration.zero,
      EnginePhase.layout,
    );
    await tester.pumpWidget(
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      Column(
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        children: <Widget>[
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          Column(
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            children: <Widget>[
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              Expanded(child: Container()),
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            ],
          ),
        ],
      ),
      Duration.zero,
      EnginePhase.layout,
    );
    final String message = tester.takeException().toString();
    expect(message, contains('\nSee also:'));
  });
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}