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SFDC Coder 8SFDC Coder 8 

Test class for Batch Apex that deletes records

Hi All,
I am new to Salesforce.
I have written a batch apex to delete records and send a csv file to some email id.
I want to write test class for the same. Here is my code
global class Del_leads implements Database.Batchable<sobject>
   Public String s;
   public integer j; 
   Public string k='\n'+'IDName'+','+'CreatedDate';  
   global Database.QueryLocator start(Database.BatchableContext BC){
      return Database.getQueryLocator([SELECT Id,Subject FROM lead]);     
global void execute(Database.BatchableContext BC,List<Task> Lds){     
    s +=k+'\n'+ lds[j].Id+','+lds[j].CreatedDate;
  Blob b=Blob.valueOf(s);
  Messaging.EmailFileAttachment efa = new Messaging.EmailFileAttachment();
  Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage(); 
  mail.setToAddresses(new String[] {abc@test.com'});        
  mail.setSenderDisplayName('Batch Processing');
  mail.setSubject('Batch Process Completed');
  mail.setPlainTextBody('Please find the attachment of deleted records');
  mail.setFileAttachments(new Messaging.EmailFileAttachment[] {efa});     
  Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });       
  delete Lds;           

global void finish(Database.BatchableContext BC){     
  System.debug(LoggingLevel.WARN,'Deleting Leads Finished');


Please help me
Thanks in Advance
Amit Chaudhary 8Amit Chaudhary 8
public class Del_leadsTest 
    static testMethod void testMethod1() 
		Lead newLead = new Lead(firstName = 'Cole', lastName = 'Swain', company = 'BlueWave', status = 'contacted' ) ;
		insert 	newLead;

			Del_leads obj = new Del_leads();


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