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Mocktail:类型“Null”不是类型“Future<Response>”的子类型

我一直在尝试按照Felangel 的天气教程测试我的 API 提供程序,因为它与我的代码非常相似,但我无法使其工作。

api_provider_test.dart

import 'package:stock_mobile/data/models/user.dart';
import 'package:test/test.dart';
import 'package:mocktail/mocktail.dart';
import 'package:http/http.dart' as http;
import 'package:stock_mobile/data/providers/api_provider.dart';

class MockHttpClient extends Mock implements http.Client {}

class MockResponse extends Mock implements http.Response {}

class FakeUri extends Fake implements Uri {}

void main() {
  group('ApiProvider', () {
    late http.Client httpClient;
    late ApiProvider apiProvider;

    setUpAll(() {
      registerFallbackValue(FakeUri());
    });

    setUp(() {
      httpClient = MockHttpClient();
      apiProvider = ApiProvider(httpClient: httpClient);
    });

    group('login', () {
      test('Throws ApiException non-200 response', () async {
        final response = MockResponse(); …
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unit-testing dart flutter

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