User repository test - Unit testing Flutter GraphQL

user_repository_test.dart

void main() {
  late MockGraphQLClient mockGraphQLClient;

  setUp(() {
    mockGraphQLClient = generateMockGraphQLClient();
  });

  group('UserRepository', () {
    test('creates a profile', () async {
      final result =
          generateMockMutation<Mutation$CreateUser>(mockGraphQLClient);
      when(() => result.hasException).thenReturn(false);
      when(() => result.parsedData).thenReturn(
        Mutation$CreateUser(
          addUser: Mutation$CreateUser$addUser(
            user: [
              Mutation$CreateUser$addUser$user(
                xid: _userId,
                email: _email,
                $__typename: 'user',
              )
            ],
            $__typename: 'user',
          ),
          $__typename: 'addUser',
        ),
      );

      final repository = UserRepository(graphQLClient: mockGraphQLClient);
      final createdUserId = await repository.create(_userId, _email);
      expect(createdUserId, _userId);

      final executedMutation = verify(
          () => mockGraphQLClient.mutate<Mutation$CreateUser>(captureAny()))
        ..called(1);
      expect(
        executedMutation.captured.last,
        isA<Options$Mutation$CreateUser>().having(
          (s) => s.variables,
          'variables',
          {
            'id': _userId,
            'email': _email,
          },
        ),
      );
    });
  });
}

const _email = 'test@test.com';
const _userId = '123';