I have a batch class and I'm trying to write a test class for that batch class but the test class is not covering the execute method. Could someone please help me on this. 

global class ACMContactDocumentExpiration implements Database.Batchable<sObject>,database.stateful {

   public List<Aircraft_Training__c> AirTrn = new List<Aircraft_Training__c>();
    public List<Crew_Staff__c> Crewlist=new List<Crew_Staff__c>();
    public List<Experience__c> Exp = new List<Experience__c>();
    public List<Training__c> Trn = new List<Training__c>();
    public List<Contact> Con = new List<Contact>();
    global Database.QueryLocator start(Database.BatchableContext BC)
   {
        AirTrn = [Select Id, Name, Experience__c,Experience__r.Name, Aircraft_Rating__c, PPC_Expiration_Date__c, PPC_Date__c, Training_Date__c FROM Aircraft_Training__c WHERE PPC_Expiration_Date__c =: Date.today()+Integer.valueOf(System.label.AL_PPC_Expiration_Days)];
        Set<String> AirTrnIds = new Set<String>();
        for(Aircraft_Training__c a: AirTrn)
            {
                AirTrnIds.add(a.Experience__r.Name);
            }
            system.debug('----------'+AirTrnIds.size()); 
        
        Exp = [Select Id, Name, Contact__c, Contact__r.Id, Last_Recurrent_Date__c FROM Experience__c WHERE Name IN: AirTrnIds AND (Last_Recurrent_Date__c =: Date.today()-Integer.valueOf(System.label.Exp_Last_Recurrent_Days) OR Last_Recurrent_Date__c != null OR Last_Recurrent_Date__c =: null)];
        Set<String> ExpIds = new Set<String>();
        for(Experience__c e: Exp)
            {
                ExpIds.add(e.Contact__r.Id);
            }
            system.debug('----------'+ExpIds.size());
            
        Trn = [Select Id, Name, Contact__c, Contact__r.Id, Expiration_Date__c, Exam_Date__c, Training_Type__c FROM  Training__c WHERE Expiration_Date__c =: Date.today()+Integer.valueOf(System.label.Training_Expiration_Days) AND (Training_Type__c =: System.label.Training_Type_Intl_Procedures OR Training_Type__c =: System.label.Training_Type_RVSM)];
        Set<String> TrnIds = new Set<String>();
        for(Training__c t: Trn)
            {
                TrnIds.add(t.Contact__r.Id);
            }
            system.debug('----------'+TrnIds.size()); 
            
        Con = [Select Id, Email FROM Contact WHERE ID IN: ExpIds OR ID IN: TrnIds]; 
        Set<String> ConIds = new Set<String>();
        for(Contact c: Con)
            {
                ConIds.add(c.Id);
            }
            system.debug('----------'+ConIds.size());
        
        string query= 'Select Id, Contact__c, Contact__r.Name, Active_License__r.License_Type__c, Active_Medical__r.Medical_Type__c,  Mandate_Record_Type__c,  Contact_Record_Type__c, License_Expiration_Date__c, Medical_Expiration_Date__c,Training_Expiration_Date__c, Crew_Email__c from Crew_Staff__c WHERE Contact__r.Id IN : ConIds';
        return Database.getQueryLocator(query);
    }
    
    global void execute(Database.BatchableContext BC, List<Crew_Staff__c> scope) {
        List<Crew_Staff__c> newCrew = new List<Crew_Staff__c>();
        Set<Id> newCrewIds = new Set<Id>();
        for(Crew_Staff__c crew:scope) {               
        if(
            
            ((crew.Contact_Record_Type__c == 'Pilot') &&
            (crew.Mandate_Record_Type__c == 'ACM') &&
            (crew.Crew_Email__c != null)) ||
            (date.valueof(crew.License_Expiration_Date__c) == System.today()+Integer.valueOf(System.label.Date_2)) ||
            (date.valueof(crew.Medical_Expiration_Date__c) == System.today()+Integer.valueof(System.label.Medical_Expiration_Days))
          
          ) {        
            Crewlist.add(crew);
            }
            newCrewIds.add(crew.Id);
        }
          system.debug('----------'+Crewlist.size());
         
      
    }
    
    global void finish(Database.BatchableContext BC) {    
    system.debug('------>'+Crewlist.size());
 
    List<Messaging.SingleEmailMessage> maillist  = new List<Messaging.SingleEmailMessage>();
        
        if(Crewlist.size()>0) {       
            for(Crew_Staff__c crewrec:Crewlist)
            {
                // Query on OrgWideEmailAddress would set "FROM address" in the email
                OrgWideEmailAddress[] owea = [Select Id From OrgWideEmailAddress where Address = 'test@test.com'];
                Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
                if (owea.size()>0) {
                    mail.setOrgWideEmailAddressId(owea.get(0).Id);
                }
                mail.setSubject('Pilot Documents Expiring Soon');
                mail.setToAddresses(new String[]{crewrec.Crew_Email__c});              
                mail.setReplyTo('flightops@acass.ca');
                string htmlBody;
              
                htmlBody =  '<p><span style=font-family:calibri, monospace> Dear  '+ crewrec.Contact__r.Name +', </span> </p>' +
               '<p><span style=font-family:calibri, monospace> This is a friendly reminder that you have the following documents coming due for renewal: </span></br>';
              
                          
                  String lType = crewrec.Active_License__r.License_Type__c;
                  Date lExpDate = date.newInstance(crewrec.License_Expiration_Date__c.year(), crewrec.License_Expiration_Date__c.month(), crewrec.License_Expiration_Date__c.day() );
                  String mType = crewrec.Active_Medical__r.Medical_Type__c;
                  Date mExpDate = crewrec.Medical_Expiration_Date__c;
                  htmlBody += +lType+ ' license will expire on ' +lExpDate+'</br>';
                  htmlBody += +mType+ ' medical will expire on ' +mExpDate+'</br>';
          
              for(Training__c t: Trn)
              {
                  String tType = t.Training_Type__c;
                  Date tExpDate = t.Expiration_Date__c;
                  htmlBody += +tType+' training will expire on ' +tExpDate +'</br>';
              }
              
              for(Aircraft_Training__c a1: AirTrn)
              {
                  String aName = a1.Aircraft_Rating__c;
                  Date aPPCexp = a1.PPC_Expiration_Date__c;
                  htmlBody += +aName+' aircraft training will expire on ' + aPPCexp +'</br>'; 
              }              
              
            
              htmlBody += '<p><span style=font-family:calibri, monospace> Please send clear, colour photos/scans the renewed document  prior to the expiration date. </span></p>'+
              '<p><span style=font-family:calibri, monospace>Kindest regards,</span></br>'+
              '<span style=font-family:calibri, monospace>Flight Operations </span></p>';
              mail.setHtmlBody(htmlBody);
               maillist.add(mail);         
            
            }
            Messaging.sendEmail(maillist);
        }
     }

 

@isTest
public class SendEmailToCrewJobscheduledtest {

public static testmethod void myUnitTest() {


List<Contact> con = new List<Contact>();
Contact c = new Contact(
Accident_Note__c = 'Test',FirstName = 'Test',LastName = 'test');
con.add(c);
insert con;

Test.startTest();


String CRON_EXP = '0 0 0 3 9 ? 2022';
String jobId = System.schedule('SendEmailToCrewJobscheduledtest', CRON_EXP, new SendEmailToCrewJobscheduled());
CronTrigger ct = [SELECT Id, CronExpression, TimesTriggered, NextFireTime FROM CronTrigger WHERE id = :jobId]; 
System.assertEquals(0, ct.TimesTriggered); 
System.assertEquals('2022-09-03 00:00:00', String.valueOf(ct.NextFireTime)); 


ACMContactDocumentExpiration b = new ACMContactDocumentExpiration();
Database.QueryLocator q1 = b.start(null);
Database.executeBatch(b, 200);

Test.stopTest();
}
}