Schedule Jobs Using the Apex Scheduler

Schedule Jobs Using the Apex Scheduler from (module - Asynchronous Apex)

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SOURCE CODE1: DailyLeadProcessor

public class DailyLeadProcessor implements Schedulable  {
    Public void execute(SchedulableContext SC){
       List<Lead> LeadObj=[SELECT Id from Lead where LeadSource=null limit 200];
        for(Lead l:LeadObj){
            l.LeadSource='Dreamforce';
            update l;
        } }}

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SOURCE CODE1: DailyLeadProcessorTest

@isTest
private class DailyLeadProcessorTest {
	static testMethod void testDailyLeadProcessor() {
		String CRON_EXP = '0 0 1 * * ?';
		List<Lead> lList = new List<Lead>();
	    for (Integer i = 0; i < 200; i++) {
			lList.add(new Lead(LastName='Dreamforce'+i, Company='Test1 Inc.', Status='Open - Not Contacted'));
		}
		insert lList;
        Test.startTest();
		String jobId = System.schedule('DailyLeadProcessor', CRON_EXP, new DailyLeadProcessor());
	} }