How to writeTest class for batch apex in salesforce?

How to write Test class for batch apex in salesforce?

Let us learn to write a test class that covers a batch apex class. Nothing better than learning from a working example.

Here is a test class for a batch apex class that updates account records that are passed through a select query.

Batch apex clas

global class BatchProcessAccount implements Database.Batchable<sObject>{

 String query;

global Database.querylocator start(Database.BatchableContext BC){

        Query = 'Select id,name,AccountNumber,type from account';

        return Database.getQueryLocator(query);

 }

 global void execute(Database.BatchableContext BC, List<account> scope){

       List<Account> AccountList = new List<Account>();

       for(account acc : scope){

           acc.AccountNumber= '8888';

           AccountList.add(acc);

       }

       update AccountList ;

    }

   global void finish(Database.BatchableContext BC){

    }

}

Test class for above batch apex class

@isTest

private class BatchProcessAccount_Test {

     

static testMethod void BatchProcessAccount_TestMethod (){

     Profile prof = [select id from profile where name='system Administrator'];

     User usr = new User(alias = 'usr', email='us.name@vmail.com',

                emailencodingkey='UTF-8', lastname='lstname',

                timezonesidkey='America/Los_Angeles',

                languagelocalekey='en_US',

                localesidkey='en_US', profileid = prof.Id,

                username='testuser128@testorg.com');

                insert usr;

   Account accRec = new Account(name='testName', Ownerid = usr.id);

   insert accRec ;

   Test.StartTest();

   BatchProcessAccount objBatch = new BatchProcessAccount();

   ID batchprocessid = Database.executeBatch(objBatch);

   Test.StopTest();

  }

}




Just create a instance of the batch apex class: BatchProcessAccount objBatch = new BatchProcessAccount();

and then pass the craeted varaible in executebatch method as below:
   ID batchprocessid = Database.executeBatch(objBatch);

 

Posted in: apex,Apex Examples,Salesforce,salesforce training,Visualforce examples,write Test class for batch apex