Return a valid BusinessCard Model based on a json file using Flutter TDD

Question

I'm trying to learn flutter TDD and I would like to make a code that should return a valid BusinessCardModel from json file that contains information about business card(s).

but when I try to run this test:

    import 'dart:convert';
    
    import 'package:cardatyapp/core/data/models/businessCard_model.dart';
    import 'package:cardatyapp/core/domain/entities/businessCard.dart';
    import 'package:flutter_test/flutter_test.dart';
    
    import '../../../fixtures/fixtures_reader.dart';
    
    void main() {
      final tbusinessCardModel = BusinessCardModel(
        id: '01',
        jobTitle: 'fullstack developer',
        jobDetails: 'creating fontend, backend & mobile applications',
        organization: 'freelance',
      );
    
      test('sould be a subclass of the Card entity', () {
        //assert
        expect(tbusinessCardModel, isA<BusinessCard>());
      });
    
      test(
          'should return a valid BusinessCardModel when json file contains BusinessCard',
          () async {
        //arrange
        final Map<String, dynamic> jsonMap = json.decode(readFixture('card.json'));
        //act
        final result = BusinessCardModel.fromJson(jsonMap);
        //assert
    
        expect(result, tbusinessCardModel);
      });
    }

I've got this error! which i couldn't understand?

    ERROR: Expected: BusinessCardModel:<BusinessCardModel>
      Actual: BusinessCardModel:<BusinessCardModel>

Here are code snippets:

card.json file:

    {
        "uuid": "recqPz5M7tQTYesc3",
            "fav_by_user": [
                "reclZ8MXHwYKSXgNz"
            ],
            "created_by_user": [
                "recQ0XTSbKoezQCmQ"
            ],
            "job_title": "Account Executive",
            "id_card": "1",
            "organization": "Buzzshare",
            "job_details": "In hac habitasse platea dictumst. Etiam faucibus cursus urna. Ut tellus.\n\nNulla ut erat id mauris vulputate elementum. Nullam varius. Nulla facilisi.",
        "createdTime": "2020-10-02T08:41:13.000Z"
    }

Business card entity:

    import 'package:equatable/equatable.dart';
    import 'package:meta/meta.dart';
    
    class BusinessCard extends Equatable {
      final String id;
      final String jobTitle;
      final String jobDetails;
      final String organization;
    
      BusinessCard({
        this.id,
        @required this.jobTitle,
        @required this.jobDetails,
        @required this.organization,
      });
    
      @override
      List<Object> get props => [
            id,
            jobTitle,
            jobDetails,
            organization,
          ];
    }

Business card Model (based on the precedent entity) :

    import 'package:meta/meta.dart';
    
    import '../../domain/entities/businessCard.dart';
    
    class BusinessCardModel extends BusinessCard {
      BusinessCardModel({
        String id,
        @required String jobTitle,
        @required String jobDetails,
        @required String organization,
      }) : super(
              id: id,
              jobTitle: jobTitle,
              jobDetails: jobDetails,
              organization: organization,
            );
      factory BusinessCardModel.fromJson(Map<String, dynamic> jsonMap) {
        return BusinessCardModel(
          id: jsonMap['id_card'],
          jobTitle: jsonMap['jobTitle'],
          jobDetails: jsonMap['jobDetails'],
          organization: jsonMap['organization'],
        );
      }
    }

To read the json file I'm using a fixtures reader:

    import 'dart:io';
    
    String readFixture(String fileName) =>
        File('test/fixtures/$fileName').readAsStringSync();

Please help me to understand & solve that error!

Answer 1

Your BusinessCardModel is extending BusinessCard which extends Equatable with all members as props. As a result when you're comparing two different instance of model with different values for members, you will get false which you're doing now! The model you're expecting's id is '01' and the model you're gonna get running BusinessCardModel.fromJson(jsonMap) has '1' as id. You should change your tbusinessCardModel to match the fixture you have defined.