facing issue in method channel internet connectivity in unit testing in flutter - flutter

Question

I have checked internet connectivity in flutter while calling api in store class like this using 'connectivity' library.
Future<bool> callApi() async {
final isInternet = await Util.checkInternetAndShowDialog(context);
if (isInternet) {
final future = _repository.callApi();
var res = await future;
return true;
}
return false;
}
In Util class network connectivity is been checked like this::
class Util {
static Future<bool> checkInternetAndShowDialog(BuildContext context) async{
var internet = await NetworkConnectivity.rechability();
if (internet == false) {
AlertMessage().showAlertDialog(context, 'error message');
}
return internet;
}
}
In NetworkConnectivity class network connectivity is been checked using Connectivity library.
class NetworkConnectivity {
static Future<bool> rechability() async {
var connectivityResult = await (Connectivity().checkConnectivity());
if (connectivityResult == ConnectivityResult.mobile) {
return true;
} else if (connectivityResult == ConnectivityResult.wifi) {
return true;
}
return false;
}
}
my test cases code is like below:
test('call api successfully', () async {
when(mockStore.callApi()).thenAnswer((realInvocation) => Future.value());
expect(await store.callApi(), true);
});
so while writing unit testing I am facing error of connectivity and method channel.
connectivity error image
Can any one help please me how I can mock for internet connectivity in unit testing and pass the test in flutter. I shall be thankful for this.