Question

我已根据this文章编写了代码n Bloc模式。在我的代码中，我需要连接到实时数据库并从中获取一些数据。但不幸的是，我无法为此编写无错误的单元测试。

这是我的‍ Res/filename_api_provider（基于上面的链接）类，提供与firebase的连接条件：

class filenameApiProvider {
    var response; 
    Future<fileModel> fetchList() async {
        DatabaseReference ref = FirebaseDatabase.instance.reference();
        await ref.child("exercises").once().then((DataSnapshot snap) {
            response = snap.value;
        });

    if (response != null) {
        return fileModel.fromJsonWorkouts(response);
    } else {
        throw Exception('Failed to load workout library api’s');
    }
}

，如果响应来自Firebase服务器，则将其传递给模型类以填充一些列表并在UI中显示它们我试图为此课程编写一个测试，这是我的尝试：

void main() {
    test('fetch data', () async {
        var obj = new filenameApiProvider();
        fileModel result = await obj.fetchWorkoutList();
         expect(result, isNotNull);
    });
 }

但这是运行测试后收到的错误：

MissingPluginException(No implementation found for method Query#observe on channel plugins.flutter.io/firebase_database)

package:flutter/src/services/platform_channel.dart 300:7  MethodChannel.invokeMethod
===== asynchronous gap ===========================
dart:async                                                _AsyncAwaitCompleter.completeError
package:flutter/src/services/platform_channel.dart        MethodChannel.invokeMethod
===== asynchronous gap ===========================
dart:async                                                _asyncThenWrapperHelper
package:flutter/src/services/platform_channel.dart        MethodChannel.invokeMethod
package:firebase_database/src/query.dart 53:38            Query._observe.<fn>
dart:async                                                Stream.first
package:firebase_database/src/query.dart 90:55            Query.once

当以Bloc模式编写代码时，如何对Firebase连接进行单元测试？

0 个答案: