Dear gurus,
I would like to know if you can provide me test class for For Task Update and Email Send to Leads in Batch..here is the batch code for the same
 

global class leadUpdateBatch implements Database.batchable<sobject>,Database.stateful{
    public Map<id,id> newLeadTaskIdMap = new map<id,id>();
    public Map<id,Task> taskMap = new Map<id,Task>();
    
    String VIP1 = Label.B2C_VIP_API_User;
    String VIP2 = Label.B2C_VIP_AAL_API_User;
    String VIP3 = Label.B2C_VIP_SWITCH_API_User;
    
    Id VIPInboundTaskId = Schema.SObjectType.Task.getRecordTypeInfosByName().get('VIP Inbound').getRecordTypeId();
    Id VIPOutboundTaskId = Schema.SObjectType.Task.getRecordTypeInfosByName().get('VIP Outbound').getRecordTypeId();
    Id OutBoundCallingTaskId = Schema.SObjectType.Task.getRecordTypeInfosByName().get('Outbound Call').getRecordTypeId();
    Id CDTaskId = Schema.SObjectType.Task.getRecordTypeInfosByName().get('ILC Task').getRecordTypeId();   
    global List<String> errorMessages = new List<String>();
    Global List<String> failedRecIdList =new List<String>();
    global Set<String> faliedIdSet=new Set<String>();
    public DateTime dt = Datetime.now().addMinutes(-integer.valueof(Label.LeadUpdateBatchInterval));
    String dispo = NULL;
    String LEAD = 'Lead';    
    
    
	Map<string,string> taskLeadFieldMap=new Map<string,string>
		{'Call_Type__c'=>'Call_Type__c', 'Disposition__c'=>'Disposition__c',
		'FollowUpLastmodified__c'=>'PilotTaskFollowup__c', 'Reason_for_Call__c'=>'Reason_for_Call__c',
		'Customer_Budget__c'=>'Customer_Budget__c', 
		'Time_Frame_for_Purchase__c'=>'Time_Frame_for_Purchase__c','TOM_Order_Number__c'=>'TOM_Order__c',
		'Chat_Engagement_Id__c'=>'Chat_Engagement_Id__c','New_Device__c'=>'Device__c',
		'Current_Carrier__c'=>'Current_Carrier__c','Current_Monthly_Bill__c'=>'Monthly_Bill__c',
		'Lines__c'=>'Lines__c', 'Savings__c'=>'Savings__c', 'Customer_Type__c'=>'Customer_Type__c',
		'T_Mobile_ID__c'=>'T_Mobile_ID__c','Customer_Contact_Phone_Number__c'=>'Phone',
		'Zip_Code__c'=>'Zip__c', 'Follow_Up_Date_Time__c'=>'Follow_Up_Date_Time__c',
		'First_Call_Attempt_Date__c'=>'First_Call_Attempt_Date__c', 
		'Second_Call_Attempt_Date__c'=>'Second_Call_Attempt__c',
        'Agent_Manager_Role__c'=>'Dispositioned_Agent_parent_role__c',
        'Agent_Name__c'=>'Dispositoned_Agent_Name__c'};
		
    global Database.QueryLocator start(Database.BatchableContext bc){

        
        return Database.getQueryLocator('Select Id,whoid,Call_Type__c,Agent_Name__c,Agent_Manager_Role__c,FollowUpLastmodified__c,disposition__c,Follow_up_Date_Time__c,Reason_for_Call__c,Customer_Budget__c,Time_Frame_for_Purchase__c,TOM_Order_Number__c,Chat_Engagement_ID__c,New_Device__c,Current_Carrier__c,Current_Monthly_Bill__c,Lines__c,Savings__c,Customer_Type__c,T_Mobile_ID__c,Customer_Contact_Phone_Number__c,Zip_Code__c,First_Call_Attempt_Date__c,Second_Call_Attempt_Date__c,RecordTypeId  from task where LastModifiedDate >=:dt and WHO.Type =: Lead and OwnerId !=:VIP1 and OwnerId !=:VIP2 and OwnerId !=:VIP3 and disposition__c !=:dispo and (RecordTypeId =:VIPInboundTaskId or RecordTypeId =:CDTaskId or RecordTypeId =:VIPOutboundTaskId or RecordTypeId =:OutBoundCallingTaskId) ORDER BY LastModifiedDate DESC');
        //return Database.getQueryLocator('Select Id,whoid,Call_Type__c,FollowUpLastmodified__c,disposition__c,Follow_up_Date_Time__c,Reason_for_Call__c,Customer_Budget__c,Time_Frame_for_Purchase__c,TOM_Order_Number__c,Chat_Engagement_ID__c,New_Device__c,Current_Carrier__c,Current_Monthly_Bill__c,Lines__c,Savings__c,Customer_Type__c,T_Mobile_ID__c,Customer_Contact_Phone_Number__c,Zip_Code__c,First_Call_Attempt_Date__c,Second_Call_Attempt_Date__c,RecordTypeId  from task where LastModifiedDate >=:dt and whoid in (select id from Lead) and OwnerId !=:VIP1 and OwnerId !=:VIP2 and OwnerId !=:VIP3 and (RecordTypeId =:VIPInboundTaskId or RecordTypeId =:CDTaskId or RecordTypeId =:VIPOutboundTaskId ) ORDER BY LastModifiedDate DESC');
        
    }
    
    global void execute(Database.BatchableContext bc,List<Task> scope){ 
        
        for(task task : scope){                       
            if(!newLeadTaskIdMap.containsKey(task.whoId)){
            	newLeadTaskIdMap.put(task.whoId,task.id);              
            }
			taskMap.put(task.id,task);
        }
		
        if(!newLeadTaskIdMap.isEmpty()){
            List<Lead> updateLeads=new List<Lead>();
            Boolean hasChanged=false;
            List<Lead> leadList = [select id,
                                   			Call_Type__c,Disposition__c,PilotTaskFollowup__c,
                                   			Reason_for_Call__c,Dispositioned_Agent_parent_role__c,Dispositoned_Agent_Name__c,Customer_Budget__c,Time_Frame_for_Purchase__c,
                                   			TOM_Order__c,Chat_Engagement_Id__c,Device__c,Current_Carrier__c,
                                   			Monthly_Bill__c,Lines__c,Savings__c,Customer_Type__c,T_Mobile_ID__c,
                                   			Phone,Zip__c,Follow_Up_Date_Time__c,First_Call_Attempt_Date__c,Second_Call_Attempt__c
                                   			from Lead where id IN:newLeadTaskIdMap.keySet()];
			
            for(Lead lead : leadList)
			{
                //faliedIdSet.add(ld.Id);
                Task taskRecord = taskMap.get(newLeadTaskIdMap.get(lead.id));
                hasChanged=false;
				for(string taskField:taskLeadFieldMap.keyset())
				{
                    System.debug('==taskRecord.get(taskField)=='+taskRecord.get(taskField));
                    System.debug('==lead.get(taskLeadFieldMap.get(taskField))=='+lead.get(taskLeadFieldMap.get(taskField)));
					if(taskRecord.get(taskField)!=NULL && taskRecord.get(taskField) != lead.get(taskLeadFieldMap.get(taskField)))
                    {                        
                        System.debug('==taskLeadFieldMap.get(taskField)=='+taskLeadFieldMap.get(taskField));                        
						lead.put(taskLeadFieldMap.get(taskField), taskRecord.get(taskField));
						hasChanged=true;
					}					
				}
                if(hasChanged)
					updateLeads.add(lead);
			}
				
            if(!updateLeads.isEmpty() ){
                System.debug('updateLeads==='+updateLeads);
                
                Database.SaveResult[] srList = database.update(updateLeads, false);
                System.debug('===srList==='+srList);
				String errMsg;
                // Iterate through each returned result
                for (Database.SaveResult sr : srList){
					errMsg='';
                    if (!sr.isSuccess()) {
                        System.debug('Successfully  ' + sr.getId());
                        faliedIdSet.add(sr.getId());
						// Operation failed, so get all errors                
                        for(Database.Error err : sr.getErrors()) {                                             
                            System.debug(err.getStatusCode() + ': ' + err.getMessage());  
                            errMsg+= '-'+ err.getMessage();                     
						}
						failedRecIdList.add(errMsg);
                    }
                }
            }
            
        } 
    }
    
    
    global void finish(Database.BatchableContext bc){
        
        
        AsyncApexJob a = [SELECT Id,Status,JobType,NumberOfErrors,JobItemsProcessed,TotalJobItems,CompletedDate,ExtendedStatus
        FROM AsyncApexJob WHERE Id =:BC.getJobId()];
        
        //Get the list of Emails from Custom setting and send notification   
        Email_Notifications__c emaillist = Email_Notifications__c.getValues('LeadUpdateBatchEmails');
        System.debug('emaillist ==== > '+emaillist);
        List<String> userList = emaillist.Email_Address__c.split(',');
          
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        
        mail.setToAddresses(userList);
        mail.setSubject('LeadUpdateBatch Status - ' + a.Status);
        mail.setSaveAsActivity(false);
        //mail.setPlainTextBody('Failed Records Ids: ' +faliedIdSet);
        //mail.setPlainTextBody('Error Message : ' +failedRecIdList);
        mail.setPlainTextBody('Failed Record Details:    ' +faliedIdSet+failedRecIdList + '\n' + 'Job Completed Date :    ' + a.CompletedDate + '\n' + 'Job Status :      ' + a.Status + '\n'+ 'Total Job Items processed :      ' + a.TotalJobItems + '\n'+ 'Number of Job Items processed :       ' + a.JobItemsProcessed + '\n' + 'Number of Failures :       '+ a.NumberOfErrors );
        //+ '\n' + 'Number of Error Messages ' + errorMessages.size() + '\n' +'Error Message' + String.join(errorMessages, '\n'));
        
        Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
    }
  
   
}

Your help is highly appreciated

Regards
Fiona