I am attaching the trigger and triggerhandler class below. Please help creating trigger handler method when event is updated.

Event Trigger:-
 

Trigger is working fine and updating event whenever Title is getting updated on Contact. Just my test method is not covering any line in my apex class when i run the test class. Please help regarding this asap.

Trigger Handler Method in Apex Class for AfterUpdate trigger on Contact

public static void AfterUpdate(List<Contact> conList, Map<Id,Contact> oldContactMap){
        
        Set<Id> UpdatedContactID = new Set<Id>();
        
        for( Contact con : conList)
        {
            if(con.Title!=oldContactMap.get(con.Id).Title){
                UpdatedContactId.add(con.Id);}
                          
        }
     
      //  system.debug('UpdatedContactId*****'+UpdatedContactId);
      
        List<Event> eventList = new List<Event>();
        try
        {
            for(Event e : [SELECT Id,Title__c FROM Event where  StartDateTime > Today and Whoid in : UpdatedContactId])
            {
                eventList.add(e);
                
            }
            
            if(eventList.size()>0){
                update eventList;
            }
            
            //System.debug('eventList' + eventList);
        }
        catch(exception e)
        {
            throw e;    
        }
    }

Test Method in Test Class for above Apex method

  @isTest static void method1() {
        Profile prof = [SELECT Id FROM Profile WHERE Name='System Administrator'];
        User user = new User(firstName = 'test1',lastName = 'test2',profileId = prof.id,
                             username = 'test@test.com'+Math.random(),email = 'test@test.com',
                             Alias = 'ts',TimeZoneSidKey = 'Asia/Kolkata',LocaleSidKey = 'en_US',
                             EmailEncodingKey = 'UTF-8',LanguageLocaleKey = 'en_US');
        insert user;
        
        System.runAs(user){
            
            List<Account>TestDataAccountList=New List<Account>(TestDataUtility.createAccounts(1));
            List<Contact>ContactList=New List<Contact>();       
            Contact Cons = (new Contact(firstname=TestDataUtility.generateRandomString(5),lastname='Test',AccountId=TestDataAccountList[0].Id,MailingPostalCode='999999',
                                        MailingStreet= 'Contact1Steet',MailingState='State45', MailingCountry='TestCountry', Title= TestDataUtility.generateRandomString(5),
                                        MailingCity='City67', isPrimary__c=True));        
            ContactList.add(Cons);
            insert ContactList;   
            
            List<Event> EventListTest = New List<Event>();
            
            Event Eve = new Event(Subject =TestDataUtility.generateRandomString(4) + 'Call', StartDateTime = Date.newInstance(2020, 12, 9),
                                  EndDateTime =Date.newInstance(2020, 12, 9), Location__c = 'Client Office', WhoId = Cons.Id, OwnerId= User.Id);
            
            EventListTest.add(Eve);
            insert EventListTest;
            
            
            Test.startTest();
            
            List<Contact>UpdatedContactList=New List<Contact>();   
            
            Contact Cons1 = (new Contact(firstname=TestDataUtility.generateRandomString(5),lastname='Test',AccountId=TestDataAccountList[0].Id,MailingPostalCode='999999',
                                        MailingStreet= 'Contact1Steet',MailingState='State45', MailingCountry='TestCountry1', Title= 'Title9',
                                        MailingCity='City67', isPrimary__c=True));
            UpdatedContactList.add(Cons1);
            update UpdatedContactList;
            
            List<Event> UpdatedEventListTest = New List<Event>();
            
            Event Eve1 = new Event(Subject =TestDataUtility.generateRandomString(4) + 'Call', StartDateTime = Date.newInstance(2016, 12, 9),
                                  EndDateTime =Date.newInstance(2016, 12, 9), Location__c = 'Client Office', WhoId = Cons1.Id, OwnerId= User.Id);
            UpdatedEventListTest.add(Eve1);
            update UpdatedEventListTest;
            
            Test.stopTest();   
            
        }
    }

I am a beginner in Salesforce and Apex. Can anyone help me write TestClass for this Apex Class.

Event Trigger Handler

public class EventTriggerHandler {

    public static String comma = ',';
    
    public static void AfterInsert(Map<id, Event> EventMap)
    {
        try
        {
            String NameTitle ='';
            String Names;
            
            List<EventRelation>EveRelationList=New List<EventRelation>();
            EveRelationList = [SELECT Id, RelationId,EventId FROM EventRelation WHERE EventId In : eventMap.keyset() and RelationId != null];
             system.debug('AfterInsert count_____'+EveRelationList.size());
            Set<Id> WhoIds = New set<Id>();
            for(EventRelation eveRel : EveRelationList){
                WhoIds.add(eveRel.RelationId);
                system.debug('WhoIds after insert_____'+WhoIds);
            }
            List<Contact> ConList = New List<Contact>();
            ConList=[Select Id,Title,FirstName,LastName, Name FROM Contact WHERE Id In : WhoIds and Title != null and Name != null];
            for(Contact c : ConList){
                if(c.Title!= null)
                {
                    NameTitle = NameTitle+c.Name + '(' + c.Title + ')' + comma ;
                }
            }
            Names = NameTitle.removeEnd(comma);
            System.debug('Names'  + Names);
            List<Event> eventList = new List<Event>();
        
            for (Event e : [select id, Title__c from Event where Id in: eventMap.keyset()])
            {
                e.Title__c = Names;
                eventList.add(e);
            }
            update eventList;
        }
        catch(exception e)
        {
             throw e;    
        }
    }
}

Event Trigger

trigger EventTrigger on Event (before insert, before update, after insert) {
    if (Trigger.IsBefore) {
        if (Trigger.isInsert) {
        }
        if (Trigger.isUpdate) {
        }
    }
    if(Trigger.IsAfter)
    {
        if (Trigger.isInsert) {
            EventTriggerHandler.AfterInsert(trigger.newMap);
        }
    }
    
}

 

Write a Apex trigger on Event to autopopulate Title of Contacts in Relatedto field of Event and display them separated by commas. Can anyone help me wiriting the trigger for this.

I am attaching the trigger and triggerhandler class below. Please help creating trigger handler method when event is updated.

Event Trigger:-
 

Trigger is working fine and updating event whenever Title is getting updated on Contact. Just my test method is not covering any line in my apex class when i run the test class. Please help regarding this asap.

Trigger Handler Method in Apex Class for AfterUpdate trigger on Contact

public static void AfterUpdate(List<Contact> conList, Map<Id,Contact> oldContactMap){
        
        Set<Id> UpdatedContactID = new Set<Id>();
        
        for( Contact con : conList)
        {
            if(con.Title!=oldContactMap.get(con.Id).Title){
                UpdatedContactId.add(con.Id);}
                          
        }
     
      //  system.debug('UpdatedContactId*****'+UpdatedContactId);
      
        List<Event> eventList = new List<Event>();
        try
        {
            for(Event e : [SELECT Id,Title__c FROM Event where  StartDateTime > Today and Whoid in : UpdatedContactId])
            {
                eventList.add(e);
                
            }
            
            if(eventList.size()>0){
                update eventList;
            }
            
            //System.debug('eventList' + eventList);
        }
        catch(exception e)
        {
            throw e;    
        }
    }

Test Method in Test Class for above Apex method

  @isTest static void method1() {
        Profile prof = [SELECT Id FROM Profile WHERE Name='System Administrator'];
        User user = new User(firstName = 'test1',lastName = 'test2',profileId = prof.id,
                             username = 'test@test.com'+Math.random(),email = 'test@test.com',
                             Alias = 'ts',TimeZoneSidKey = 'Asia/Kolkata',LocaleSidKey = 'en_US',
                             EmailEncodingKey = 'UTF-8',LanguageLocaleKey = 'en_US');
        insert user;
        
        System.runAs(user){
            
            List<Account>TestDataAccountList=New List<Account>(TestDataUtility.createAccounts(1));
            List<Contact>ContactList=New List<Contact>();       
            Contact Cons = (new Contact(firstname=TestDataUtility.generateRandomString(5),lastname='Test',AccountId=TestDataAccountList[0].Id,MailingPostalCode='999999',
                                        MailingStreet= 'Contact1Steet',MailingState='State45', MailingCountry='TestCountry', Title= TestDataUtility.generateRandomString(5),
                                        MailingCity='City67', isPrimary__c=True));        
            ContactList.add(Cons);
            insert ContactList;   
            
            List<Event> EventListTest = New List<Event>();
            
            Event Eve = new Event(Subject =TestDataUtility.generateRandomString(4) + 'Call', StartDateTime = Date.newInstance(2020, 12, 9),
                                  EndDateTime =Date.newInstance(2020, 12, 9), Location__c = 'Client Office', WhoId = Cons.Id, OwnerId= User.Id);
            
            EventListTest.add(Eve);
            insert EventListTest;
            
            
            Test.startTest();
            
            List<Contact>UpdatedContactList=New List<Contact>();   
            
            Contact Cons1 = (new Contact(firstname=TestDataUtility.generateRandomString(5),lastname='Test',AccountId=TestDataAccountList[0].Id,MailingPostalCode='999999',
                                        MailingStreet= 'Contact1Steet',MailingState='State45', MailingCountry='TestCountry1', Title= 'Title9',
                                        MailingCity='City67', isPrimary__c=True));
            UpdatedContactList.add(Cons1);
            update UpdatedContactList;
            
            List<Event> UpdatedEventListTest = New List<Event>();
            
            Event Eve1 = new Event(Subject =TestDataUtility.generateRandomString(4) + 'Call', StartDateTime = Date.newInstance(2016, 12, 9),
                                  EndDateTime =Date.newInstance(2016, 12, 9), Location__c = 'Client Office', WhoId = Cons1.Id, OwnerId= User.Id);
            UpdatedEventListTest.add(Eve1);
            update UpdatedEventListTest;
            
            Test.stopTest();   
            
        }
    }