Hello friends, I have a schedulable class.

global class SchedulableTNOFTPJob implements Schedulable {
    global void execute(SchedulableContext sc) {
    if ([SELECT count() FROM AsyncApexJob WHERE (JobType='BatchApex' OR JobType='ScheduledApex') AND (Status = 'Processing' OR Status = 'Preparing')] < 5){
            try {
              //for(Integer i=0; i < 50; i++) {
              Datetime sysTime = System.now();
              ProcessTNOFiles batch = new ProcessTNOFiles();
              Id cronId = System.scheduleBatch(batch, 'schedFiles' + sysTime.getTime(), 1);     
              //}
            } catch (System.AsyncException ae) {
              
            }
        } else {
          System.debug(LoggingLevel.WARN,'ProcessTNOFiles Finished');
          //Build the system time of now + 20 seconds to schedule the batch apex.
          Datetime sysTime = System.now();
          Integer rand = Integer.valueOf(Math.Random() * 10);
          sysTime = sysTime.addSeconds(20+rand);
          String chron_exp = '' + sysTime.second() + ' ' + sysTime.minute() + ' ' + sysTime.hour() + ' ' + sysTime.day() + ' ' + sysTime.month() + ' ? ' + sysTime.year();
          system.debug(chron_exp);
          SchedulableTNOFTPJob ftpFiles = new SchedulableTNOFTPJob();
          //Schedule the next job, and give it the system time so name is unique
          Id cronId = System.schedule('ftpFiles' + sysTime.getTime(),chron_exp,ftpFiles);
          System.abortJob(sc.getTriggerId());
          System.debug('*******ProcessTNOFiles FAIL CRON ID: '+cronId+', but MAIN ID: '+sc.getTriggerId());
        }
    }
}

and it's test class is here

@isTest
public class TestSchedulableTNOFTPJob {
    
    static testMethod void myUnitTest() {
    test.startTest();
        AsyncApexJob aa = new AsyncApexJob();
       
	SchedulableTNOFTPJob nightlyUpdate = new SchedulableTNOFTPJob();
	String schedule = '0 0 23 * * ?';
	system.schedule('Nightly Update', schedule, nightlyUpdate);
        
	test.stopTest();
    }
}

But the test class is covering only "IF" condition of schedulable class.Please help. Thanks in anticipation :)