BlocTest mocking 供应商

Question

我想模拟 Provider 和 LoginBloc 以测试小部件。 但我被困住了。 有什么推荐吗？

base_page.dart

class BasePage extends StatefulWidget {
  int tab;
  BasePage(this.tab, {Key key}) : super(key: key);

  @override
  _BasePageState createState() => _BasePageState();
}

class _BasePageState extends State<BasePage>
    with TickerProviderStateMixin, AutomaticKeepAliveClientMixin {
  @override
  void initState() {
    super.initState();
    _tabController = new TabController(vsync: this, length: 5);
    _tabController.addListener(_handleTabSelection);
    if (widget.tab != null) {
      initialTab = widget.tab;
      _tabController.index = initialTab;
    } else {
      initialTab = 0;
      _tabController.index = initialTab;
    }
  }

  @override
  void dispose() {
    _tabController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    super.build(context);
    size = getMediaSize(context);
    contextBase = context;
    preferencesProvider = PreferencesProvider(context);
    Provider.of(context).changeScorePoints(2000);
    firebaseAnalytics = new FirebaseAnalytics();
    preferencesProvider.getClient().then((value) {
      if (value != null) {
        firebaseAnalytics.setUserId(value.id);
        FirebaseCrashlytics.instance.setUserIdentifier(value.id);
        FlutterError.onError = FirebaseCrashlytics.instance.recordFlutterError;
      }
    });

    return Scaffold();
  }
}

provider.dart

import 'package:flutter/material.dart';
import 'package:p/src/controllers/login_bloc.dart';

class Provider extends InheritedWidget {
  static Provider _instance;
  factory Provider({Key key, Widget child}) {
    if (_instance == null) {
      _instance = new Provider._internal(
        key: key,
        child: child,
      );
    }
    return _instance;
  }
  Provider._internal({Key key, Widget child}) : super(key: key, child: child);

  final loginBloc = Bloc();

  @override
  bool updateShouldNotify(InheritedWidget oldWidget) => true;

  static Bloc of(BuildContext context) {
    return context.dependOnInheritedWidgetOfExactType<Provider>().loginBloc;
  }
}

base_page_widget_test.dart

typedef Callback = void Function(MethodCall call);

class BuildContextMock extends Mock implements BuildContext {}

class LoginBlocMock extends Mock implements Bloc {}

abstract class MockWithExpandedToString extends Mock {
  @override
  String toString({DiagnosticLevel minLevel = DiagnosticLevel.debug}) =>
      super.toString();
}

class FakeFirebaseAppPlatform extends Fake implements FirebaseAppPlatform {}

void setupFirebaseAuthMocks([Callback customHandlers]) {
  TestWidgetsFlutterBinding.ensureInitialized();

  MethodChannelFirebase.channel.setMockMethodCallHandler((call) async {
    if (call.method == 'Firebase#initializeCore') {
      return [
        {
          'name': defaultFirebaseAppName,
          'options': {
            'apiKey': '123',
            'appId': '123',
            'messagingSenderId': '123',
            'projectId': '123',
          },
          'pluginConstants': {},
        }
      ];
    }

    if (call.method == 'Firebase#initializeApp') {
      return {
        'name': call.arguments['appName'],
        'options': call.arguments['options'],
        'pluginConstants': {},
      };
    }

    if (customHandlers != null) {
      customHandlers(call);
    }

    return null;
  });
}

class MockFirebaseCore extends Mock
    with MockPlatformInterfaceMixin
    implements FirebasePlatform {
  @override
  FirebaseAppPlatform app([String name = defaultFirebaseAppName]) {
    return super.noSuchMethod(
      Invocation.method(#app, [name]),
      returnValue: FakeFirebaseAppPlatform(),
      returnValueForMissingStub: FakeFirebaseAppPlatform(),
    );
  }
}

void main() {
  TabController _tabController;
  setupFirebaseAuthMocks();

  final mock = MockFirebaseCore();

  const FirebaseOptions testOptions = FirebaseOptions(
    apiKey: 'apiKey',
    appId: 'appId',
    messagingSenderId: 'messagingSenderId',
    projectId: 'projectId',
  );

  setUpAll(() async {
    await Firebase.initializeApp();
  });

  testWidgets('BasePage Test', (WidgetTester tester) async {
    final loginBlocMock = LoginBlocMock();
    final context = BuildContextMock();
    when(Provider.of(context)).thenAnswer((_) => loginBlocMock);
    await tester.pumpWidget(MaterialApp(home: BasePage(0)));
  });
}

我不断收到此错误：

══╡例外由FLUTTER测试框架╞════════════════════════════════════════ ════════════ 在运行测试时引发以下 NoSuchMethodError：在 null 上调用了 getter 'loginBloc' 。 Receiver: null Tried calling: loginBloc When the exception was thrown, this was the stack: #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5) #1 Provider.of (package:p/src/ controllers/provider.dart:23:67) #2 main.. (file:///C:/flutterprojects/p_app_flutter/test/src/views/pages/base_page/base_page_widget_test.ZBB14127678960FAE97D873950EA201356Z:21) . (file:///C:/flutterprojects/p_app_flutter/test/src/views/pages/base_page/base_page_widget_test.dart:248:34) #4 testWidgets.. (package:flutter_test/src/widget_tester.ZBB14127678960FAE156D:7678960FAE159D:7678960FAE157 29）（从package：STACK_TRACE省略了一帧）。 ══════════════════════════════════════════════════ ══════════════════ 测试失败。 请参阅上面的异常日志。 测试描述为：BasePage Test