Good day I am trying to perform sum unit testing on below function that creates a document on cloud firestore firebase. I have used a function in my app and it creates a document, but I want to write a test.dart file that performs unit testing for the below fuction and prints some output even on the console for verifications
But I think I am not writing my Test.dart in proper way.I have get an error

Function in file createdatabase.dart

Future<dynamic> createDoc(dataMap,collection) async {

  final TransactionHandler createTransaction = (Transaction tx) async {

    final DocumentSnapshot ds = await tx.get(db.collection(collection).document());

    final Map<String, dynamic> result = {};

    result.addAll(dataMap);

    result['id'] = ds.documentID;

    await tx.set(ds.reference, result);



    return result;

  };

Test.dart

import 'package:cloud_firestore/cloud_firestore.dart';

import 'package:test/test.dart';

import '../lib/service/createfirebase.dart';



void main() {

  CreateFirebase cf = new CreateFirebase();   

   //test    

    test('Creating doc on firestore ', () async{ 

      Object dataObj ={'name':'Dev','title':'Dev'};

      var create = await cf.createDoc(dataObj, 'crude');

      expect(true,create);

      print('The doc details are');

      print(dataObj);

    });



}

The error after running this test is
MissingPluginException(No implementation found for method Firestore#runTransaction on channel plugins.flutter.io/cloud_firestore)

But I do not understand why since I have all the dependencies and if I call that function in another class the doc gets created.But calling inside this test gives the above error. I guess I am not doing it in the right way.Any constribution or any reference I can look at that helps on testing such functions.

Thank you

Regards