Write Unit test case for Hive in flutter mobile app

**Is your feature request related to a problem? Please describe.**
I am using Hive flutter plugin for local storage. I want to write unit test for the same. But I can not Mock the Hive Object and test it.

**Describe the solution you'd like**
I am using the given below code to store and get data from local storage. When I am trying to write unit test case, i am not able to mock Hive object to test. Please provide some sample to write unit test case for. the below scenario.
'
Future initHive() async {
await Hive.initFlutter();
}

Future storeData(
String storageKey, dynamic value}) async {
var storageBox = await Hive.openBox('data');
storageBox.put(storageKey, value);
}

Future getStoredData(String storageKey) async {
var storageBox = await Hive.openBox('data');
var value = storageBox.get(storageKey);
return value;
}
'

**Describe alternatives you've considered**

**Version**
- Platform: iOS, Android, Mac, Windows, Linux, Web
- Flutter version: 1.12.13+hotfix.8
- Hive version: 1.4.1+1

Start with the issue's initHive, storeData, and getStoredData examples, then read the Hive and Flutter testing guidance to determine how Hive.openBox can be exercised. Done means providing a documented sample that explains how to test these operations, including the limitation around mocking Hive objects.

Written by the indexing model from the issue text.