packages/flutter/test/gestures/monodrag_test.dart

// 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/gestures.dart';
import 'package:flutter_test/flutter_test.dart';

import 'gesture_tester.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  testGesture('do not crash on up event for a pending pointer after winning arena for another pointer', (GestureTester tester) {
    // Regression test for https://github.com/flutter/flutter/issues/75061.

    final VerticalDragGestureRecognizer v = VerticalDragGestureRecognizer()
      ..onStart = (_) { };
    final HorizontalDragGestureRecognizer h = HorizontalDragGestureRecognizer()
      ..onStart = (_) { };

    const PointerDownEvent down90 = PointerDownEvent(
      pointer: 90,
      position: Offset(10.0, 10.0),
    );

    const PointerUpEvent up90 = PointerUpEvent(
      pointer: 90,
      position: Offset(10.0, 10.0),
    );

    const PointerDownEvent down91 = PointerDownEvent(
      pointer: 91,
      position: Offset(20.0, 20.0),
    );

    const PointerUpEvent up91 = PointerUpEvent(
      pointer: 91,
      position: Offset(20.0, 20.0),
    );

    v.addPointer(down90);
    GestureBinding.instance.gestureArena.close(90);
    h.addPointer(down91);
    v.addPointer(down91);
    GestureBinding.instance.gestureArena.close(91);
    tester.async.flushMicrotasks();

    GestureBinding.instance.handleEvent(up90, HitTestEntry(MockHitTestTarget()));
    GestureBinding.instance.handleEvent(up91, HitTestEntry(MockHitTestTarget()));
  });

  testWidgets('VerticalDragGestureRecognizer asserts when kind and supportedDevices are both set', (WidgetTester tester) async {
    expect(
      () {
        VerticalDragGestureRecognizer(
          kind: PointerDeviceKind.touch,
          supportedDevices: <PointerDeviceKind>{ PointerDeviceKind.touch },
        );
      },
      throwsA(
        isA<AssertionError>().having((AssertionError error) => error.toString(),
        'description', contains('kind == null || supportedDevices == null')),
      ),
    );
  });

  testWidgets('HorizontalDragGestureRecognizer asserts when kind and supportedDevices are both set', (WidgetTester tester) async {
    expect(
      () {
        HorizontalDragGestureRecognizer(
          kind: PointerDeviceKind.touch,
          supportedDevices: <PointerDeviceKind>{ PointerDeviceKind.touch },
        );
      },
      throwsA(
        isA<AssertionError>().having((AssertionError error) => error.toString(),
        'description', contains('kind == null || supportedDevices == null')),
      ),
    );
  });
}

class MockHitTestTarget implements HitTestTarget {
  @override
  void handleEvent(PointerEvent event, HitTestEntry entry) { }
}