无法在颤振测试中加载资产

Question

rootBundle 在应用程序中运行良好，但在测试中它抛出异常 ERROR: Unable to load asset: assets/config/prod.json

配置.dart

import 'dart:convert';
import 'package:flutter/services.dart' show rootBundle;

class Configuration {

  final Map<String, String> _config = {};

  String get(String key) {
    return _config[key];
  }

  Future<void> load() async {
    _config.clear();
    final configString = await rootBundle.loadString('assets/config/prod.json');
    final configJson = jsonDecode(configString) as Map<String, dynamic>;
    _config.addAll(Map.castFrom<String, dynamic, String, String>(configJson));
  }

}

configuration_test.dart

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:my_app/data/models/configuration.dart';

void main() {

  setUpAll(() {
    WidgetsFlutterBinding.ensureInitialized();
  });

  test('should load configuration', () async {
    final config = Configuration();
    await config.load();
    expect(config.get('client_id'), 'client_id');
  });

}

pubspec.yaml

...
dev_dependencies:
  ...
  flutter_test:
    sdk: flutter

flutter:
  assets:
    - assets/config/
...

我究竟做错了什么？

Answer 1

我发现我的测试有什么问题。有TestWidgetsFlutterBinding在flutter_test包中，我应该使用它而不是WidgetsFlutterBinding从material包中

configuration_test.dart

import 'package:flutter_test/flutter_test.dart';
import 'package:my_app/data/models/configuration.dart';

void main() {

  setUpAll(() {
    TestWidgetsFlutterBinding.ensureInitialized();
  });

  test('should load configuration', () async {
    final config = Configuration();
    await config.load();
    expect(config.get('client_id'), 'client_id');
  });

}

Answer 2

如果您在文件中定义JSON文件，puspec.yaml则必须编写 json 文件的全名，如下所示

assets:
  - assets/data.json

在你的情况下，路径将是

assets:
  - assets/config/prod.json