packages/connectivity/connectivity_for_web/example/integration_test/src/connectivity_mocks.dart

import 'dart:async';
import 'dart:html';
import 'dart:js_util' show getProperty;

import 'package:flutter_test/flutter_test.dart';

/// A Fake implementation of the NetworkInformation API that allows
/// for external modification of its values.
///
/// Note that the DOM API works by internally mutating and broadcasting
/// 'change' events.
class FakeNetworkInformation extends Fake implements NetworkInformation {
  String? _type;
  String? _effectiveType;
  num? _downlink;
  int? _rtt;

  @override
  String? get type => _type;

  @override
  String? get effectiveType => _effectiveType;

  @override
  num? get downlink => _downlink;

  @override
  int? get rtt => _rtt;

  FakeNetworkInformation({
    String? type,
    String? effectiveType,
    num? downlink,
    int? rtt,
  })  : this._type = type,
        this._effectiveType = effectiveType,
        this._downlink = downlink,
        this._rtt = rtt;

  /// Changes the desired values, and triggers the change event listener.
  Future<void> mockChangeValue({
    String? type,
    String? effectiveType,
    num? downlink,
    int? rtt,
  }) async {
    this._type = type;
    this._effectiveType = effectiveType;
    this._downlink = downlink;
    this._rtt = rtt;

    // This is set by the onConnectivityChanged getter...
    final Function onchange = getProperty(this, 'onchange') as Function;
    onchange(Event('change'));
  }
}