Hi All,

I'm new to coding and am struggling. I have the following code but am onlying getting 37% code coverage :

trigger trg_LeadToCampaign on Lead (after update, after insert) {
    
    //Create a new set to hold all the Leads with CampaignId - Set will contain information in <LeadId - CampaignId> format
    Set<String> existingCampaignMembers = new Set<String>();

    //Query CampaignMember object and fetch all the members related to current context Leads
    for(CampaignMember cM : [Select LeadId, CampaignId from CampaignMember where LeadId IN: Trigger.newMap.keySet()]) {
        
        //Add in set
        existingCampaignMembers.add(cM.LeadId + '-' + cM.campaignId);
    }
    
    
    //Create a list to hold all the CampaignMember records to be inserted
    List<CampaignMember> cMembers = new List<CampaignMember>();

    //Loop through Trigger.New records and check if member need to be created
    for(Lead l : Trigger.New) {
        
        //Check if campaign is not null
        if (l.HubSpot_Campaign__c != null ) {
            
            //Create string to check the existing leads
            String uniquenessCriteria = l.Id + '-' + l.HubSpot_Campaign__c;
            
            //Check in set if this lead is already associated with any campaign record 
            //and only create the CampaignMember if Lead and Campaign is not found in set
            if(!existingCampaignMembers.contains(uniquenessCriteria)){
                
                //Create a new Campign member record
                CampaignMember cm = new CampaignMember();
                cm = new CampaignMember();
                cm.LeadId = l.Id;
                cm.CampaignId = l.HubSpot_Campaign__c;
                cm.Status = 'Responded';

                //Add this record in the list of Campaign Members to be inserted
                cMembers.add(cm);
            }
        }
        
   //Insert records in database
    if(cMembers.size() > 0)
        database.insert( cMembers, false);
      }  
    }

@isTest
private class test_trgr_leadtocampaign {

    public static testMethod void testleadtocampaign()
    {
        
    System.debug('VistageDebug: entering TriggerTests_LeadtoCampaign');
    
    //Create Campaign
    Campaign testCampaign = new Campaign(Name='Test', IsActive=True);
    insert testCampaign;
    
    //Create Lead AND Add to Campaign
    Lead testLead = new Lead(FirstName='Bart', LastName='Simpson', Company='The Simpsons',
      Status=VistageConstants.LEAD_INITIAL_STATUS, Country='US', PostalCode='92130',
      Email='scooby@doo.com', List_Assignment__c = 'Reserve',
      RecordTypeId=VistageConstants.LEAD_RECORDTYPE_UK_Member_Candidate);
    insert testLead;

    //Create Campaign Member
    CampaignMember newcm = new CampaignMember (LeadId=testLead.Id, CampaignId=testCampaign.Id);
    insert newcm;
    
    
    //Create Lead
    Lead newLead = new Lead(FirstName='Scooby', LastName='Doo', Company='Mystery, Inc',
    Status=VistageConstants.LEAD_INITIAL_STATUS, Country='US', PostalCode='92130',
    Email='scooby@doo.com', List_Assignment__c = 'Reserve',
    RecordTypeId=VistageConstants.LEAD_RECORDTYPE_UK_Member_Candidate);
    insert newLead;
 
    //Add Campaign Id to Hubspot Campaign Field to fire trigger
    Lead updateMe = [SELECT Id FROM Lead WHERE Id = :newLead.Id];
    updateMe.HubSpot_Campaign__c = testCampaign.Id;
    update updateMe;

    //Check Lead is in Campaign
    CampaignMember afterupdate = [SELECT Lead.id, CampaignId, HasResponded  FROM CampaignMember WHERE lead.id= :newlead.id AND campaignid = :testcampaign.id];
    System.assert(afterupdate.lead.id == newlead.id);
}
}

I'm struggling with the following pieces of code:

 //Add in set
        existingCampaignMembers.add(cM.LeadId + '-' + cM.campaignId);
    }
    

And

//Create string to check the existing leads
            String uniquenessCriteria = l.Id + '-' + l.HubSpot_Campaign__c;

If anyone code help it would be really appreciated as I need to get this code deployed asap.

Thanks

Kev