Hi Guys and girls,

I have recently written my very first scheduled apex class. This is my first one ever, so far it seems to work. I am trying to write a test class, but I am coming with issues, mainly with code coverage. I cannot write  a test capable of passing or if it does pass, it will only test like 24%. 

I was hoping to maybe get some tips on:

* My class, any issues that might present themselves

*Perhaps a method of only adding records that have been changed by class to list for update? or does it not matter really?

*Help to write my test class so that it passes atleast 75%

Please any help would be very much appreciated. Thank you in advance.

This is my scheduled apex class:

 

**
* To schedule the Daily reconciliation:
*    NOTE: It should run at midnight every day on it's own, but if you make
*    changes and need to requeue run the command below from the developer's console
*
*    scheduledMonthly.scheduleIt();
*    NOTE: This class is designed to replace the ServiceSupportReview Time based workflows.
*/
 
global class scheduledDaily_ServiceSupportReviews implements Schedulable {
  public static String CRON_EXP = '0 0 15 * * ? *';

    
    global static String scheduleIt() {
        scheduledDaily_ServiceSupportReviews  sm = new scheduledDaily_ServiceSupportReviews ();
        return System.schedule('Daily Reconciliation', CRON_EXP, sm);
    }

    
    global void execute(SchedulableContext sc) {
        //Code goes here
        
         List<Service__c> Servs = new List<Service__c>();
         
         Date TodayDate = date.today();

         

    for(Service__c S : [SELECT id, Service_Name__c, End_of_Service_Support__c, X30Days_Review__c, X60Days_Review__c, X40DaysBefore_Review__c, X270Days_Review__c, X180Days_Review__c, X90Days_Review__c,  Start_of_Service__c, Account__c FROM Service__c where service_active__c = true]){
    
    If(S.Service_Name__c == 'Intensive Property Coaching'){
     //30 Days support Review boolean
      if ((S.End_of_Service_Support__c).addDays(-335) == date.today() && S.X30Days_Review__c == false) {
        S.X30Days_Review__c = true;
      
    //60 Days support Review boolean  
      } else if ((S.End_of_Service_Support__c).addDays(-305) == date.today() && S.X60Days_Review__c == false) {
        S.X60Days_Review__c = True;
    
    }
    }
    
    If(S.Service_Name__c != 'Essential Property Education Only'){
    //90 Days support Review boolean
      if ((S.End_of_Service_Support__c).addDays(-275) == date.today() && S.X90Days_Review__c == false) {
        S.X90Days_Review__c = true;
      
    //180 Days support Review boolean  
      } else if ((S.End_of_Service_Support__c).addDays(-185) == date.today() && S.X180Days_Review__c == false) {
        S.X180Days_Review__c = True;
        
    //270 Days support Review boolean   
      } else if ((S.End_of_Service_Support__c).addDays(-95) == date.today() && S.X270Days_Review__c == false) {
        S.X270Days_Review__c = true;
    
    //40 Days before end of support
     } else if ((S.End_of_Service_Support__c).addDays(-40) == date.today() && S.X40DaysBefore_Review__c == false) {
        S.X40DaysBefore_Review__c = true;
 
      }
      }
      
      //Add altered services to a list
      
    
      Servs.add(S);
     
    }
    
    
    if (!Servs.isEmpty()) {   
    update Servs;
 }
    
    
    
}
}

This is my attempt at a test:
(Currently getting error - System.AsyncException: Based on configured schedule, the given trigger will never fire.

@isTest
                                
private class TestSchedulableClass {

   // CRON expression: midnight on March 15.
   // Because this is a test, job executes
   // immediately after Test.stopTest().
   public static String CRON_EXP = '0 0 15 15 03 ? 2015';

   static testmethod void test() {
   
   Account acc = new Account(Name = 'Test Schedule Account');
    insert acc;
   Service__c serTest = new Service__c(Account__c = acc.id);
      Test.startTest();

      // Schedule the test job
      String jobId = System.schedule('ScheduleApexClassTest',
                        CRON_EXP, 
                        new scheduledDaily_ServiceSupportReviews());
         
      // Get the information from the CronTrigger API object
      CronTrigger ct = [SELECT Id, CronExpression, TimesTriggered, 
         NextFireTime
         FROM CronTrigger WHERE id = :jobId];

      // Verify the expressions are the same
      System.assertEquals(CRON_EXP, 
         ct.CronExpression);

      // Verify the job has not run
      System.assertEquals(0, ct.TimesTriggered);

      // Verify the next time the job will run
      System.assertEquals('2015-03-15 15:00:00', 
         String.valueOf(ct.NextFireTime));
      // Verify the scheduled job hasn't run yet.
      Service__c [] S = [SELECT id, Service_Name__c, End_of_Service_Support__c, X30Days_Review__c, X60Days_Review__c, X40DaysBefore_Review__c, X270Days_Review__c, X180Days_Review__c, X90Days_Review__c,  Start_of_Service__c, Account__c FROM Service__c where service_active__c = true];
      System.assertEquals(S.size(),0);
      Test.stopTest();

      // Now that the scheduled job has executed after Test.stopTest(),
      //   fetch the new merchandise that got added.
     // System.assertEquals(ml.size(), 1);

   }
   
   }