flutter_flutter/packages/flutter/test/widgets/semantics_debugger_test.dart

// 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/material.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('SemanticsDebugger smoke test', (WidgetTester tester) async {
    // This is a smoketest to verify that adding a debugger doesn't crash.
    await tester.pumpWidget(
      new Stack(
        children: <Widget>[
          const Semantics(),
          const Semantics(
            container: true,
          ),
          const Semantics(
            label: 'label',
          ),
        ],
      ),
    );

    await tester.pumpWidget(
      new SemanticsDebugger(
        child: new Stack(
          children: <Widget>[
            const Semantics(),
            const Semantics(
              container: true,
            ),
            const Semantics(
              label: 'label',
            ),
          ],
        ),
      ),
    );

    expect(true, isTrue); // expect that we reach here without crashing
  });

  testWidgets('SemanticsDebugger reparents subtree',
      (WidgetTester tester) async {
    final GlobalKey key = new GlobalKey();

    await tester.pumpWidget(
      new SemanticsDebugger(
        child: new Stack(
          children: <Widget>[
            const Semantics(label: 'label1'),
            new Positioned(
              key: key,
              left: 0.0,
              top: 0.0,
              width: 100.0,
              height: 100.0,
              child: const Semantics(label: 'label2'),
            ),
          ],
        ),
      ),
    );

    await tester.pumpWidget(
      new SemanticsDebugger(
        child: new Stack(
          children: <Widget>[
            const Semantics(label: 'label1'),
            new Semantics(
              container: true,
              child: new Stack(
                children: <Widget>[
                  new Positioned(
                    key: key,
                    left: 0.0,
                    top: 0.0,
                    width: 100.0,
                    height: 100.0,
                    child: const Semantics(label: 'label2'),
                  ),
                  const Semantics(label: 'label3'),
                ],
              ),
            ),
          ],
        ),
      ),
    );

    await tester.pumpWidget(
      new SemanticsDebugger(
        child: new Stack(
          children: <Widget>[
            const Semantics(label: 'label1'),
            new Semantics(
              container: true,
              child: new Stack(
                children: <Widget>[
                  new Positioned(
                      key: key,
                      left: 0.0,
                      top: 0.0,
                      width: 100.0,
                      height: 100.0,
                      child: const Semantics(label: 'label2')),
                  const Semantics(label: 'label3'),
                  const Semantics(label: 'label4'),
                ],
              ),
            ),
          ],
        ),
      ),
    );

    expect(tester.takeException(), isNull);
  });

  testWidgets('SemanticsDebugger interaction test',
      (WidgetTester tester) async {
    final List<String> log = <String>[];

    await tester.pumpWidget(
      new SemanticsDebugger(
        child: new Material(
          child: new ListView(
            children: <Widget>[
              new RaisedButton(
                onPressed: () {
                  log.add('top');
                },
                child: const Text('TOP'),
              ),
              new RaisedButton(
                onPressed: () {
                  log.add('bottom');
                },
                child: const Text('BOTTOM'),
              ),
            ],
          ),
        ),
      ),
    );

    await tester.tap(find.text('TOP'));
    expect(log, equals(<String>['top']));
    log.clear();

    await tester.tap(find.text('BOTTOM'));
    expect(log, equals(<String>['bottom']));
    log.clear();
  });

  testWidgets('SemanticsDebugger scroll test', (WidgetTester tester) async {
    final Key childKey = new UniqueKey();

    await tester.pumpWidget(
      new SemanticsDebugger(
        child: new ListView(
          children: <Widget>[
            new Container(
              key: childKey,
              height: 5000.0,
              color: Colors.green[500],
            ),
          ],
        ),
      ),
    );

    expect(tester.getTopLeft(find.byKey(childKey)).dy, equals(0.0));

    await tester.fling(find.byType(ListView), const Offset(0.0, -200.0), 200.0);
    await tester.pump();

    expect(tester.getTopLeft(find.byKey(childKey)).dy, equals(-480.0));

    await tester.fling(find.byType(ListView), const Offset(200.0, 0.0), 200.0);
    await tester.pump();

    expect(tester.getTopLeft(find.byKey(childKey)).dy, equals(-480.0));

    await tester.fling(find.byType(ListView), const Offset(-200.0, 0.0), 200.0);
    await tester.pump();

    expect(tester.getTopLeft(find.byKey(childKey)).dy, equals(-480.0));

    await tester.fling(find.byType(ListView), const Offset(0.0, 200.0), 200.0);
    await tester.pump();

    expect(tester.getTopLeft(find.byKey(childKey)).dy, equals(0.0));
  });

  testWidgets('SemanticsDebugger long press', (WidgetTester tester) async {
    bool didLongPress = false;

    await tester.pumpWidget(
      new SemanticsDebugger(
        child: new GestureDetector(
          onLongPress: () {
            expect(didLongPress, isFalse);
            didLongPress = true;
          },
          child: const Text('target'),
        ),
      ),
    );

    await tester.longPress(find.text('target'));
    expect(didLongPress, isTrue);
  });

  testWidgets('SemanticsDebugger slider', (WidgetTester tester) async {
    double value = 0.75;

    await tester.pumpWidget(
      new SemanticsDebugger(
        child: new Material(
          child: new Center(
            child: new Slider(
              value: value,
              onChanged: (double newValue) {
                value = newValue;
              },
            ),
          ),
        ),
      ),
    );

    // The fling below must be such that the velocity estimation examines an
    // offset greater than the kTouchSlop. Too slow or too short a distance, and
    // it won't trigger. The actual distance moved doesn't matter since this is
    // interpreted as a gesture by the semantics debugger and sent to the widget
    // as a semantic action that always moves by 10% of the complete track.
    await tester.fling(find.byType(Slider), const Offset(-100.0, 0.0), 2000.0);
    expect(value, equals(0.65));
  });

  testWidgets('SemanticsDebugger checkbox', (WidgetTester tester) async {
    final Key keyTop = new UniqueKey();
    final Key keyBottom = new UniqueKey();

    bool valueTop = false;
    final bool valueBottom = true;

    await tester.pumpWidget(
      new SemanticsDebugger(
        child: new Material(
          child: new ListView(
            children: <Widget>[
              new Checkbox(
                key: keyTop,
                value: valueTop,
                onChanged: (bool newValue) {
                  valueTop = newValue;
                },
              ),
              new Checkbox(
                key: keyBottom,
                value: valueBottom,
                onChanged: null,
              ),
            ],
          ),
        ),
      ),
    );

    await tester.tap(find.byKey(keyTop));

    expect(valueTop, isTrue);
    valueTop = false;
    expect(valueTop, isFalse);

    await tester.tap(find.byKey(keyBottom));

    expect(valueTop, isFalse);
    expect(valueTop, isFalse);
  });
}