如何正确测试颤振块
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【中文标题】如何正确测试颤振块【英文标题】：How to test flutter bloc correctly 【发布时间】：2021-06-12 22:48:38 【问题描述】：今天我尝试添加我的第一个测试，但我马上遇到了问题。我遵循了许多教程并阅读了更多内容，但我无法使用 flutter_test 或 bloc_test 库进行简单的 LoginBloc 测试。我不得不做一些根本错误的事情，但我就是找不到。我认为它与堆栈跟踪中的以下行有关：The argument type 'Bloc<Event, State>' can't be assigned to the parameter type 'dynamic Function()'.
这是整个堆栈跟踪：
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/bloc_test-8.0.0-nullsafety.0/lib/src/when_listen.dart:52:10: Error: The argument type 'Bloc<Event, State>' can't be assigned to the parameter type 'dynamic Function()'.
- 'Bloc' is from 'package:bloc/src/bloc.dart' ('/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/bloc-7.0.0-nullsafety.3/lib/src/bloc.dart').
when(bloc).calls(#state).thenReturn(initialState);
^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/bloc_test-8.0.0-nullsafety.0/lib/src/when_listen.dart:52:16: Error: The method 'calls' isn't defined for the class 'When<dynamic>'.
- 'When' is from 'package:mocktail/src/mocktail.dart' ('/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/mocktail-0.0.2-dev.5/lib/src/mocktail.dart').
Try correcting the name to the name of an existing method, or defining a method named 'calls'.
when(bloc).calls(#state).thenReturn(initialState);
^^^^^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/bloc_test-8.0.0-nullsafety.0/lib/src/when_listen.dart:55:8: Error: The argument type 'Bloc<Event, State>' can't be assigned to the parameter type 'dynamic Function()'.
- 'Bloc' is from 'package:bloc/src/bloc.dart' ('/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/bloc-7.0.0-nullsafety.3/lib/src/bloc.dart').
when(bloc).calls(#listen).thenAnswer((invocation)
^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/bloc_test-8.0.0-nullsafety.0/lib/src/when_listen.dart:55:14: Error: The method 'calls' isn't defined for the class 'When<dynamic>'.
- 'When' is from 'package:mocktail/src/mocktail.dart' ('/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/mocktail-0.0.2-dev.5/lib/src/mocktail.dart').
Try correcting the name to the name of an existing method, or defining a method named 'calls'.
when(bloc).calls(#listen).thenAnswer((invocation)
^^^^^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/bloc_test-8.0.0-nullsafety.0/lib/src/when_listen.dart:58:14: Error: The argument type 'Bloc<Event, State>' can't be assigned to the parameter type 'dynamic Function()'.
- 'Bloc' is from 'package:bloc/src/bloc.dart' ('/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/bloc-7.0.0-nullsafety.3/lib/src/bloc.dart').
when(bloc).calls(#state).thenReturn(state);
^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/bloc_test-8.0.0-nullsafety.0/lib/src/when_listen.dart:58:20: Error: The method 'calls' isn't defined for the class 'When<dynamic>'.
- 'When' is from 'package:mocktail/src/mocktail.dart' ('/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/mocktail-0.0.2-dev.5/lib/src/mocktail.dart').
Try correcting the name to the name of an existing method, or defining a method named 'calls'.
when(bloc).calls(#state).thenReturn(state);
^^^^^
dart:async/stream_controller.dart 561:44 _StreamController.addError
dart:async/stream_controller.dart 830:13 _StreamSinkWrapper.addError
package:stream_channel/src/guarantee_channel.dart 145:14 _GuaranteeSink._addError
package:stream_channel/src/guarantee_channel.dart 136:5 _GuaranteeSink.addError
package:flutter_tools/src/test/flutter_platform.dart 439:27 FlutterPlatform._startTest
===== asynchronous gap ===========================
dart:async/zone.dart 1286:19 _CustomZone.registerUnaryCallback
dart:async-patch/async_patch.dart 40:23 _asyncThenWrapperHelper
package:flutter_tools/src/test/flutter_platform.dart 341:36 FlutterPlatform.loadChannel
package:flutter_tools/src/test/flutter_platform.dart 306:44 FlutterPlatform.load
package:test_core/src/runner/loader.dart 225:38 Loader.loadFile.<fn>
===== asynchronous gap ===========================
dart:async/zone.dart 1286:19 _CustomZone.registerUnaryCallback
dart:async-patch/async_patch.dart 40:23 _asyncThenWrapperHelper
package:test_core/src/runner/loader.dart Loader.loadFile.<fn>
package:test_core/src/runner/load_suite.dart 97:31 new LoadSuite.<fn>.<fn>
package:test_core/src/runner/load_suite.dart 96:17 new LoadSuite.<fn>.<fn>
package:test_core/src/runner/load_suite.dart 107:8 new LoadSuite.<fn>
package:test_api/src/backend/invoker.dart 231:15 Invoker.waitForOutstandingCallbacks.<fn>
package:test_api/src/backend/invoker.dart 228:14 Invoker.waitForOutstandingCallbacks.<fn>
dart:async/zone.dart 1354:13 _rootRun
dart:async/zone.dart 1258:19 _CustomZone.run
dart:async/zone.dart 1788:10 _runZoned
dart:async/zone.dart 1710:10 runZoned
package:test_api/src/backend/invoker.dart 228:5 Invoker.waitForOutstandingCallbacks
package:test_api/src/backend/invoker.dart 383:17 Invoker._onRun.<fn>.<fn>.<fn>
===== asynchronous gap ===========================
dart:async/zone.dart 1286:19 _CustomZone.registerUnaryCallback
dart:async-patch/async_patch.dart 40:23 _asyncThenWrapperHelper
package:test_api/src/backend/invoker.dart Invoker._onRun.<fn>.<fn>.<fn>
dart:async/zone.dart 1354:13 _rootRun
dart:async/zone.dart 1258:19 _CustomZone.run
dart:async/zone.dart 1788:10 _runZoned
dart:async/zone.dart 1710:10 runZoned
package:test_api/src/backend/invoker.dart 370:9 Invoker._onRun.<fn>.<fn>
dart:async/zone.dart 1354:13 _rootRun
dart:async/zone.dart 1258:19 _CustomZone.run
dart:async/zone.dart 1788:10 _runZoned
dart:async/zone.dart 1710:10 runZoned
package:test_api/src/backend/invoker.dart 150:7 Invoker.guard
package:test_api/src/backend/invoker.dart 413:15 Invoker._guardIfGuarded
package:test_api/src/backend/invoker.dart 369:7 Invoker._onRun.<fn>
package:stack_trace/src/chain.dart 94:24 Chain.capture.<fn>
dart:async/zone.dart 1354:13 _rootRun
dart:async/zone.dart 1258:19 _CustomZone.run
dart:async/zone.dart 1788:10 _runZoned
dart:async/zone.dart 1710:10 runZoned
package:stack_trace/src/chain.dart 92:12 Chain.capture
package:test_api/src/backend/invoker.dart 368:11 Invoker._onRun
package:test_api/src/backend/live_test_controller.dart 153:11 LiveTestController.run
dart:async/future.dart 198:37 new Future.microtask.<fn>
dart:async/zone.dart 1346:47 _rootRun
dart:async/zone.dart 1258:19 _CustomZone.run
dart:async/zone.dart 1162:7 _CustomZone.runGuarded
dart:async/zone.dart 1202:23 _CustomZone.bindCallbackGuarded.<fn>
dart:async/zone.dart 1354:13 _rootRun
dart:async/zone.dart 1258:19 _CustomZone.run
dart:async/zone.dart 1162:7 _CustomZone.runGuarded
dart:async/zone.dart 1202:23 _CustomZone.bindCallbackGuarded.<fn>
dart:async/schedule_microtask.dart 40:21 _microtaskLoop
dart:async/schedule_microtask.dart 49:5 _startMicrotaskLoop
dart:isolate-patch/isolate_patch.dart 120:13 _runPendingImmediateCallback
dart:isolate-patch/isolate_patch.dart 185:5 _RawReceivePortImpl._handleMessage
Failed to load "######\test\bloc\login\login_bloc_test.dart":
Compilation failed
Test: ######\test\bloc\login\login_bloc_test.dart
Shell: C:\src\flutter\bin\cache\artifacts\engine\windows-x64\flutter_tester.exe
这是我的 login_bloc_test：
class MockAppRepository extends Mock implements Repository
void main()
MockAppRepository repository = MockAppRepository();
setUp(()
repository = MockAppRepository();
);
group('LoginBloc test', ()
final user =
User(1, 'email', 'firstName', 'lastName', 'status', 'username', null);
test('emits LoginLoading & LoginSuccess after successful login', ()
when(repository.logIn('email', 'password'))
.thenAnswer((realInvocation) async => user);
final bloc = LoginBloc(repository);
bloc.add(LogIn('email', 'password'));
expectLater(
bloc,
emitsInOrder([
LoginInitial(),
LoginLoading(),
LoginSuccess(user),
]));
);
blocTest<LoginBloc, LoginState>(
'emits LoginLoading & LoginSuccess after successful login',
build: ()
when(repository.logIn('email', 'password'))
.thenAnswer((realInvocation) async => user);
return LoginBloc(repository);
,
act: (bloc) => bloc.add(LogIn('email', 'password')),
expect: () => [
LoginInitial(),
LoginLoading(),
LoginSuccess(user),
],
);
);
【问题讨论】：
【参考方案1】：好吧，如果有人期待同样的问题，那么有更新的 bloc_test 版本正在解决这个问题。 bloc_test: 8.0.0-nullsafety.5 是你想要的。
【讨论】：
【参考方案2】：第二个测试是：
expect: <LoginState>[
LoginInitial(),
LoginLoading(),
LoginSuccess(user),
],
【讨论】：
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