public static void uniqueRelationshipOwnerEmails(List<relationship_owner__c> roList){
    //count the unique emails  that have been sent by a relationship owner
    // add all contacts associated with relationship owner to map.
    Map<id, Contact> contactMap = new Map<Id, Contact>([SELECT Id,
                                                        New_Relationship_Owner1__c
                                                        FROM Contact
                                                        WHERE New_Relationship_owner1__c IN : roList]);
    system.debug('Contacts found = ' + contactMap.size());
    //put tasks where whoId is in the contact map into a new map
    List<Task> taskList = [SELECT Id, WhoId,Subject
                           FROM Task
                           WHERE WhoId IN :contactMap.keySet()
                           AND Subject LIKE '%Pardot List Email%'];
    system.debug('Tasks Found  and added to map = ' + taskList.size());
    //use set to dedupe the list
    Map<Id, Set<String>> subjectLineMap = new Map<Id, Set<String>>();

    for(task t : taskList){
        Id ownerId = contactMap.get(t.WhoId).New_Relationship_Owner1__c;
        if(!subjectLineMap.containsKey(ownerId)){
            subjectLineMap.put(ownerId, new Set<String>());

        }
    }
    system.debug('Map size   =' + subjectLineMap.size());
    system.debug('map values =' + subjectLineMap.values());
    system.debug('map keys   =' + subjectLineMap.Keyset());
    for(relationship_owner__c r : roList){
        r.Unique_Emails_Sent__c = subjectLineMap.get(r.Id).size();
        roList.add(r);

    }
    insert(roList);



}

@isTest
static void uniqueEmailTest(){
    TestDataFactory.createRelationshipOwnerandInfuencer(5, 1);
    List<relationship_owner__C> ownerTestList = [SELECT id, Unique_Emails_Sent__c From relationship_owner__c];
    //update ownerTestList;
    //get the contacts and assign them tasks
    List<Contact> influencers = [SELECT Id FROM Contact];
    List<Task> tasks = new List<Task>();
    for(Contact c : influencers){
       Task t = new Task(Subject = 'Pardot List Email 1', WhoId = c.Id);
        tasks.add(t);
    }
    insert tasks;
    system.debug('task size' + tasks.size());
    update ownerTestList;
}