lib/web_ui/test/canvaskit/initialization_services_vs_ui_test.dart

// Copyright 2013 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 'dart:html' as html;

import 'package:test/bootstrap/browser.dart';
import 'package:test/test.dart';
import 'package:ui/src/engine.dart';

import 'common.dart';

void main() {
  internalBootstrapBrowserTest(() => testMain);
}

void testMain() {
  test('services are initalized separately from UI', () async {
    expect(scheduleFrameCallback, isNull);
    expect(windowFlutterCanvasKit, isNull);

    expect(findGlassPane(), isNull);
    expect(Keyboard.instance, isNull);
    expect(MouseCursor.instance, isNull);
    expect(KeyboardBinding.instance, isNull);
    expect(PointerBinding.instance, isNull);

    // After initializing services the UI should remain intact.
    await initializeEngineServices();
    expect(scheduleFrameCallback, isNotNull);
    expect(windowFlutterCanvasKit, isNotNull);

    expect(findGlassPane(), isNull);
    expect(Keyboard.instance, isNull);
    expect(MouseCursor.instance, isNull);
    expect(KeyboardBinding.instance, isNull);
    expect(PointerBinding.instance, isNull);

    // Now UI should be taken over by Flutter.
    await initializeEngineUi();
    expect(findGlassPane(), isNotNull);
    expect(Keyboard.instance, isNotNull);
    expect(MouseCursor.instance, isNotNull);
    expect(KeyboardBinding.instance, isNotNull);
    expect(PointerBinding.instance, isNotNull);

    // TODO(hterkelsen): https://github.com/flutter/flutter/issues/60040
  }, skip: isIosSafari);
}

html.Element? findGlassPane() {
  return html.document.querySelector('flt-glass-pane');
}