I was able to write two apex triggers that connect two objects(Contacts and a Custom Object) via a lookup field when they have the same first name, last name, and zip code. This was done in my sandbox environment and I was able to get this working perfectly there. I then, with help through the moudles and references, was able to write a small sample test class in order to have this deployed in my production environment, but i am only able to get 24 percent coverage. 

Please help as I am stuck, below is one of my triggers and my test class. 

 

trigger VoterID2Contact on Voter_File_TX__c (before insert,before update,after insert,after update) 

{ if(checkRecursive.runOnce){ return;}
{
    Set<String> set_Str = new Set<string>();
    Map<String,Contact> mp_ContactID;
    
    if(Trigger.isAfter && Trigger.isUpdate)
    {
        for(Contact ContactID : [Select ID,FirstName, LastName,MailingPostalCode, Voter_File_ID__c From Contact])
        {
                    if(mp_ContactID==null)
                        mp_ContactID = new Map<String,Contact>();
            
            mp_ContactID.put(ContactID.FirstName +''+ContactID.LastName +''+ContactID.MailingPostalCode,ContactID);

 
                    }
        
        for(Voter_File_TX__c VoterList : Trigger.new)
    {
        if(mp_ContactID!=null && mp_ContactID.containsKey(VoterList.First_Name__c+''+ VoterList.Last_Name__c+''+ VoterList.Zipcode__c))

        {

       mp_ContactID.get(VoterList.First_Name__c +''+ VoterList.Last_Name__c +''+ VoterList.Zipcode__c).Voter_File_ID__c = VoterList.id;

}

}
 
if(mp_ContactID!=null && mp_ContactID.values()!=null)
        checkRecursive.runOnce = true;
        update mp_ContactID.values();

    }
}
}

@isTest
public class TestClass 
{
    static testMethod void testMethod1()
    {
        
        Voter_File_TX__c vf = new Voter_File_TX__c();
        vf.First_Name__c ='Test';
        vf.Last_Name__c ='Test';
        vf.RNC_ID__c = 'Test';
        vf.Zipcode__c = 'Test'; 
        
         insert vf;

        Contact cont = new Contact();
        cont.FirstName ='Test';
        cont.LastName = 'Test';
        cont.RNC_ID__c = 'Test';
        cont.MailingPostalCode = 'test';
    
        insert cont;
        
        vf.First_Name__c = cont.FirstName ;
        vf.Last_Name__c = cont.LastName ;
        vf.Zipcode__c = cont.MailingPostalCode ;
        vf.RNC_ID__c = cont.RNC_ID__c ;
        vf.Contact__c = cont.Id ;
        
        cont.FirstName = vf.First_Name__c ;
        cont.LastName = vf.Last_Name__c ;
        cont.MailingPostalCode = vf.Zipcode__c;
        cont.RNC_ID__c = vf.RNC_ID__c ;
        
       
    }

}