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SFDC Coder 8SFDC Coder 8 

Please help in Test class for batch apex

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. Her is my code.
Batch Apex:
global class Del_leads implements Database.Batchable<sobject>
{  
       
   Public String s;
   public integer j; 
   Public string k='\n'+'IDName'+','+'CreatedDate';  
   Custom_Setting1__c mc=Custom_Setting1__c.getInstance('days');
   String dy=mc.day__c;
   global Database.QueryLocator start(Database.BatchableContext BC){
      
      return Database.getQueryLocator([SELECT Id,Subject FROM lead where createdData=:Today.addDays-(dy)]);     
   }
   
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();
  efa.setFileName(m+'attachment.csv');
  efa.setBody(b);
        
  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');
}

}
Test Class:
@isTest 
public class Del_leadsTest 
{
    static testMethod void testMethod1() 
	{
	
		Lead newLead = new Lead(firstName = 'Cole', lastName = 'Swain', company = 'BlueWave', status = 'contacted' ) ;
		insert 	newLead;
		
		Test.startTest();

			Del_leads obj = new Del_leads();
			obj.j=0;
			DataBase.executeBatch(obj);

		Test.stopTest();
		
	}
}

This test class is failing while running. Error is getting at custom setting line.
Please help me in writing test class for this.
Thanks in Advance
Best Answer chosen by SFDC Coder 8
karthik R 80karthik R 80
Hi SFDC CODER 8,


In the above code u haven't inserted Custm settings ,

Insert custom settings
Custom_Setting1__c cs=new Custom_Setting1__c();
cs.fieldname='data';
insert cs;
if it is helpful please mark is best Answer.
Thanks,
karthik