I have created a schedulable class to send birthday emails to contacts. The script uses two custom field Birth Month(text) and Birth Date(text). I am not able to get 75% code coverage for my test class. I am new to salesforce and struggling with this for couple of days now. Hope I can find the solution through this forum. 

My apex class and test class are given below
 

public class ScheduleBirthdayEmails implements Schedulable{
    public void execute(SchedulableContext sc){
        Date todayDate = Date.today();
        String birthDate = String.valueOf(todayDate.day());
        String birthMonth;
        switch on todayDate.month() {
            when 1 {
                birthMonth = 'Jan';
            }
            when 2 {
                birthMonth = 'Feb';
            }
            when 3 {
                birthMonth = 'Mar';
            }
            when 4 {
                birthMonth = 'Apr';
            }
            when 5 {
                birthMonth = 'May';
            }
            when 6 {
                birthMonth = 'Jun';
            }
            when 7 {
                birthMonth = 'Jul';
            }
            when 8 {
                birthMonth = 'Aug';
            }
            when 9 {
                birthMonth = 'Sep';
            }
            when 10 {
                birthMonth = 'Oct';
            }
            when 11 {
                birthMonth = 'Nov';
            }
            when 12 {
                birthMonth = 'Dec';
            }
        }
        String perEmail;
        String workEmail;
        String altEmail;
        String prefEmail;
        List<Id> idList = new List<Id>();
        List<String> emailList = new List<String>();
                
        List<Contact> conList = [select id,npe01__Preferred_Email__c,npe01__HomeEmail__c,npe01__AlternateEmail__c,npe01__WorkEmail__c from Contact where Birthday_Email__c = TRUE AND date__c=:birthDate AND month__c =:birthMonth];
               
        for(Contact c:conList){
            perEmail = c.npe01__HomeEmail__c;
            workEmail = c.npe01__WorkEmail__c;
            altEmail = c.npe01__AlternateEmail__c;
            prefEmail = c.npe01__Preferred_Email__c;
            
            if(prefEmail == 'Personal' && perEmail.length() > 0){
                emailList.add(perEmail);
                idList.add(c.id);
            }
            if(prefEmail == 'Work' && workEmail.length() > 0){
                emailList.add(workEmail);
                idList.add(c.id);
            }
            if(prefEmail == 'Alternate' && altEmail.length() > 0){
                emailList.add(altEmail);
                idList.add(c.id);
            }
        }
  		
         if(idList.size() > 0) {
            EmailTemplate template = [select id from EmailTemplate where developername = 'Send_Birthday_Emails' LIMIT 1];
            Messaging.MassEmailMessage emails = new Messaging.MassEmailMessage();
            emails.setTargetObjectIds(idList);
            emails.setTemplateId(template.id);
            Messaging.sendEmail(new Messaging.MassEmailMessage[]{emails});
        }
    }

}

 

@isTest
public class BirthdayEmailTest {
    @testSetup
    static void setupContactData(){
         List<Contact> conList = new List<Contact>();
        Date todayDate = System.today();
        String birthMonth = 'Apr';
        switch on todayDate.month() {
            when 1 {
                birthMonth = 'Jan';
            }
            when 2 {
                birthMonth = 'Feb';
            }
            when 3 {
                birthMonth = 'Mar';
            }
            when 4 {
                birthMonth = 'Apr';
            }
            when 5 {
                birthMonth = 'May';
            }
            when 6 {
                birthMonth = 'Jun';
            }
            when 7 {
                birthMonth = 'Jul';
            }
            when 8 {
                birthMonth = 'Aug';
            }
            when 9 {
                birthMonth = 'Sep';
            }
            when 10 {
                birthMonth = 'Oct';
            }
            when 11 {
                birthMonth = 'Nov';
            }
            when 12 {
                birthMonth = 'Dec';
            }
        }
        
        Contact c1 = new Contact();
        c1.LastName = 'Contact1';
        c1.Date__c = String.valueOf(todayDate.day());
        c1.Month__c = birthMonth;
        c1.Birthday_Email__c = true;
        c1.npe01__HomeEmail__c = 'harshvikram16@gmail.com';
        c1.npe01__Preferred_Email__c = 'Personal';
        conList.add(c1);
        
        Contact c2 = new Contact();
        c2.LastName = 'Contact2';
        c2.Date__c = String.valueOf(todayDate.day());
        c2.Month__c = birthMonth;
        c2.Birthday_Email__c = true;
        c2.npe01__WorkEmail__c = 'kriti.c30@gmail.com';
        c2.npe01__Preferred_Email__c = 'Work';
        conList.add(c2);
        
        Contact c3 = new Contact();
        c3.LastName = 'Contact3';
        c3.Date__c = String.valueOf(todayDate.day());
        c3.Month__c = birthMonth;
        c3.Birthday_Email__c = true;
        c3.npe01__AlternateEmail__c = 'alternateemail@test.com';
        c3.npe01__Preferred_Email__c = 'Alternate';
        conList.add(c3);
        
        insert conList;
        
        
    }
    
    @istest
    static void testScheduleBirthdayEmails(){
        String CRON_EXP = '0 0 0 * * ? *';
        Test.startTest();
        ScheduleBirthdayEmails sbe = new ScheduleBirthdayEmails();
        String jobId = System.schedule('ScheduleBirthdayEmails', CRON_EXP, sbe);
        ScheduleBirthdayEmails sbe = new ScheduleBirthdayEmails();
        CronTrigger ct = [select id, cronexpression,timestriggered, nextfiretime from crontrigger where id=:jobid];
        System.assertequals(CRON_EXP,ct.CronExpression);
        
        Test.stopTest();
        
    }
}

 

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