Schedule Jobs Using the Apex Scheduler - Create an Apex class that uses Scheduled Apex to update Lead records.

Create an Apex class that implements the Schedulable interface to update Lead records with a specific LeadSource. Write unit tests that achieve 100% code coverage for the class. This is very similar to what you did for Batch Apex.
  • Create an Apex class called 'DailyLeadProcessor' that uses the Schedulable interface.
  • The execute method must find the first 200 Leads with a blank LeadSource field and update them with the LeadSource value of 'Dreamforce'.
  • Create an Apex test class called 'DailyLeadProcessorTest'.
  • In the test class, insert 200 Lead records, schedule the DailyLeadProcessor class to run and test that all Lead records were updated correctly.
  • The unit tests must cover all lines of code included in the DailyLeadProcessor class, resulting in 100% code coverage.
  • Run your test class at least once (via 'Run All' tests the Developer Console) before attempting to verify this challenge.

Answer

DailyLeadProcessor.apxc

global class DailyLeadProcessor implements Schedulable {
    global void execute(SchedulableContext ctx) {
        List<Lead> leads = [SELECT Id 
                            FROM Lead 
                            WHERE LeadSource  = NULL LIMIT 200];
        List<Lead> newLeads = new List<Lead>();
        for(Lead l:leads){
            l.LeadSource = 'DreamForce';
            newLeads.add(l);
        }
        
        update newLeads;
    }
}


DailyLeadProcessorTest

@isTest
private class DailyLeadProcessorTest {
    public static String CRON_EXP =' 0 0 0 15 3 ? 2022';
    static testmethod void testScheduledJob(){
        List <Lead> leads = new List<Lead>();
        for(Integer i=0; i<200; i++){
            Lead l = new Lead(FirstName='First '+i,
                              LastName = 'LastName',
                              Company='The Inc'
                             );
            leads.add(l);
        }
        insert leads;
        
        Test.startTest();
        String jobId = System.Schedule('ScheduledApexTest',
                                       CRON_EXP,
                                       new DailyLeadProcessor());
        Test.stopTest();
        
        List<Lead> checkleads = new List<Lead>();
        checkleads = [select Id from Lead 
                      where LeadSource='Dreamforce' and Company = 'The Inc'];
        System.assertEquals(200, checkleads.size(), 'Leads were not created');
        
        
    }
    
}

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