packages/flutter/test/cupertino/switch_test.dart

// Copyright 2017 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/cupertino.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('Switch can toggle on tap', (WidgetTester tester) async {
    final Key switchKey = new UniqueKey();
    bool value = false;
    await tester.pumpWidget(
      new Directionality(
        textDirection: TextDirection.ltr,
        child: new StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            return new Center(
              child: new CupertinoSwitch(
                key: switchKey,
                value: value,
                onChanged: (bool newValue) {
                  setState(() {
                    value = newValue;
                  });
                },
              ),
            );
          },
        ),
      ),
    );

    expect(value, isFalse);
    await tester.tap(find.byKey(switchKey));
    expect(value, isTrue);
  });

  testWidgets('Switch can drag (LTR)', (WidgetTester tester) async {
    bool value = false;

    await tester.pumpWidget(
      new Directionality(
        textDirection: TextDirection.ltr,
        child: new StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            return new Center(
              child: new CupertinoSwitch(
                value: value,
                onChanged: (bool newValue) {
                  setState(() {
                    value = newValue;
                  });
                },
              ),
            );
          },
        ),
      ),
    );

    expect(value, isFalse);

    await tester.drag(find.byType(CupertinoSwitch), const Offset(-30.0, 0.0));

    expect(value, isFalse);

    await tester.drag(find.byType(CupertinoSwitch), const Offset(30.0, 0.0));

    expect(value, isTrue);

    await tester.pump();
    await tester.drag(find.byType(CupertinoSwitch), const Offset(30.0, 0.0));

    expect(value, isTrue);

    await tester.pump();
    await tester.drag(find.byType(CupertinoSwitch), const Offset(-30.0, 0.0));

    expect(value, isFalse);
  });

  testWidgets('Switch can drag (RTL)', (WidgetTester tester) async {
    bool value = false;

    await tester.pumpWidget(
      new Directionality(
        textDirection: TextDirection.rtl,
        child: new StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            return new Center(
              child: new CupertinoSwitch(
                value: value,
                onChanged: (bool newValue) {
                  setState(() {
                    value = newValue;
                  });
                },
              ),
            );
          },
        ),
      ),
    );

    expect(value, isFalse);

    await tester.drag(find.byType(CupertinoSwitch), const Offset(30.0, 0.0));

    expect(value, isFalse);

    await tester.drag(find.byType(CupertinoSwitch), const Offset(-30.0, 0.0));

    expect(value, isTrue);

    await tester.pump();
    await tester.drag(find.byType(CupertinoSwitch), const Offset(-30.0, 0.0));

    expect(value, isTrue);

    await tester.pump();
    await tester.drag(find.byType(CupertinoSwitch), const Offset(30.0, 0.0));

    expect(value, isFalse);
  });

}