我的文件endpoints.json在/WORKPLACE_DIR/assets/json/endpoints.json中

{
  "key": "value"
}

我已经更新了我的pubspec.yaml

assets:
    - assets/json/endpoints.json

单位：/tests/some_test.dart
我知道

test('my test', () async {
      final endpoints = json.decode(await rootBundle.loadString("assets/json/endpoints.json"));
    }

它仍然给出错误

ERROR: Unable to load asset: assets/json/endpoints.json
package:flutter/src/services/asset_bundle.dart 221:7  PlatformAssetBundle.load
===== asynchronous gap ===========================
dart:async                                            _AsyncAwaitCompleter.completeError
package:flutter/src/services/asset_bundle.dart        PlatformAssetBundle.load
===== asynchronous gap ===========================
dart:async                                            _asyncThenWrapperHelper
package:flutter/src/services/asset_bundle.dart        PlatformAssetBundle.load
package:flutter/src/services/asset_bundle.dart 67:33  AssetBundle.loadString

我试过flutter clean，但它仍然给出这个错误。我不知道该怎么做。