Flutter 测试模拟 GraphQL 突变未找到存根

Question

I'm using mockito and graphql packages in my flutter app in order to write tests for my graphql mutations without it actually doing a database read. The way Mockito works is that i set a "when" clause which makes it so whenever that particular method is called on my mocker it uses what I defined instead of what would run normally.

I've defined a when for my mocked GraphQLClient for client.mutate(). however, when I call mutate it says that there is no mock defined. I've done research online and several people fixed the issue by making sure they define the when first, which I have done, but it still hasn't solved my issue. Here is my initialization and packages

import 'package:mockito/annotations.dart';
import 'package:mockito/mockito.dart';

import 'package:graphql/client.dart' as graphql;
import 'login_screen_test.mocks.dart';

@GenerateMocks([graphql.GraphQLClient])

and the client and mutation

  final mockClient = MockGraphQLClient();
  MutationOptions loginMutation = MutationOptions(
    document: gql(
      r'''
        mutation Login($email: String!, $password: String!) {
          login(input: {email:$email password:$password}) {
            accessToken
            refreshToken
            user {
              id
            }
          }
        }
      ''',
    ),
    variables: <String, dynamic>{
      'email': 'doodle@noodle.com',
      'password': 'password',
    },
  );

and now the test case

  test('Login success if done correctly', () async {
    when(mockClient.mutate(loginMutation)).thenAnswer((_) async => graphql.QueryResult(source: null, data: {'login': {'accessToken': 'ooglyboogly', 'refreshToken': 'mtnDew'}}));
    await userRepo.loginEmailPassword(mockClient, email: 'doodle@noodle.com', password: 'password');
    expect(store.state.auth.accessToken, isNot(''));
  });

Answer 1

Make sure the mocks file is generated. The file name should be something like that: 'your_test_file_name.mocks.dart'

if you can't find the generated mocks file try running

flutter pub run build_runner build