Use Json data file on Flutter unit test-CodePudding

I would like to do the unit test for model by Flutter. Then I want to use test json data.

But I got the error message.
type 'List<dynamic>' is not a subtype of type 'Map<String, dynamic>' in type cast

I want to know how to solve this issue.

Here is the test codes.

void main() {
  group('Gift Test', () {
    test('Gift model test', () {
      final file = File('json/gift_test.json').readAsStringSync();
      final gifts = Gift.fromJson(jsonDecode(file) as Map<String, dynamic>);

      expect(gifts.id, 999);
    });
  });
}

Here is the model

@freezed
abstract class Gift with _$Gift {
  @Implements(BaseModel)
  const factory Gift({
    int id,
    String name,
    int amount,
    Image image,
  }) = _Gift;

  factory Gift.fromJson(Map<String, dynamic> json) => _$GiftFromJson(json);
}

And this is the test data.

[
  {
    "id": 999,
    "name": "testest",
    "amount": 30000,
    "image": {
      "id": 9999,
      "image": {
        "url": "https://text.jpg",
      },
    },
  }
]

CodePudding user response：

Your json file is a list, not an object, either you change your json file in

  {
    "id": 999,
    "name": "testest",
    "amount": 30000,
    "image": {
      "id": 9999,
      "image": {
        "url": "https://text.jpg",
      },
    },
  }

Or you will need to update your code to take the first element of the list:

final file = File('json/gift_test.json').readAsStringSync();
final gifts = Gift.fromJson((jsonDecode(file) as List).first as Map<String, dynamic>);