Hello all, 

I have been trying to test an Event trigger but I'm kind of lost in a particular part of the execution that I want and need to test.
On the Event object I have a Boolean custom field, has_Attachment__c. So if you insert an attachment in an event this Boolean field will be set to true. How do I test this?  
I use a centralize object initialization class: 
 

public with sharing class EventCentralizeObjectInitialization {
	
	
	 public static List<Event> InitTestInsertEvents(Integer count)
     {
     	
     	Account account = new Account(Name ='testEventAfterInsertAccount'); 
    	insert account; 
    	
    	Profile p = [SELECT Id FROM Profile WHERE Name='System Administrator']; 
        User u = new User(Alias = 'systemAd',
                          Email='systemAd@testorg.com', 
       					  EmailEncodingKey='UTF-8', 
       					  LastName='Testing', 
       					  LanguageLocaleKey='en_US', 
            			          LocaleSidKey='en_US', 
            			          ProfileId = p.Id, 
            			          TimeZoneSidKey='America/Los_Angeles', 
            			          UserName='systemAdEvent@testorg.com');
    	
    	insert u; 
    	
    	DateTime dt = System.now(); 
    	
    		List<Attachment> eventAttMap = new List<Attachment>();
     		Blob bodyBlob=Blob.valueOf('Unit Test Attachment Body');
     		
     		List<Event> eventList = new List<Event>(); 
     		    		    		        	        	
        	for(Integer x=0; x< count; x++)
        	{
        		eventList.add(new Event(OwnerId = u.Id,
        		                  Subject ='The test subject',
        				  StartDateTime= dt.addMinutes(-120),
        				  EndDateTime = dt,
        				  WhatId = account.id,
        				  Activity_Type__c = 'Inspection')); 
        	}
        	
        	        		
        	return eventList;	
    
       }
         
 }

Then I pull the method InitTestInsertEvents to my test class like this: 
 

@isTest
private class TestEventAfterInsert {

    public static testMethod void testPrepareEventAfterInsert()
    {
    		 
    	List<Event> eventList = EventCentralizeObjectInitialization.InitTestInsertEvents(2); 
    	List<Attachment> attList = new List<Attachment>();
    	List<FeedItem> feedList = new List<FeedItem>();
    	List<Event> eventToUpdate = new List<Event>();
    	Set<Id> ownerIds = new Set<Id>();
    	Set<Id> accountIds = new Set<Id>();
    	Set<Id> eventAttIds = new Set<Id>(); 
    	Id eventID;
    	
    	
    	Blob bodyBlob=Blob.valueOf('Unit Test Attachment Body');
    	
    	
    	Test.StartTest();  
    	insert eventList;
    	Test.StopTest(); 
    	
    	Map<Id, Event> eventmap = new Map<Id, Event>(eventList);
    	List<Event> events = [SELECT Id, OwnerId, Account.Id, has_Attachment__c, (SELECT Id FROM Attachments) FROM Event WHERE Id IN :eventmap.keySet()]; 	
    	
    	System.assertEquals(events.size(), 2); 
     
     	for(Event e: events)
     	{
     		if(e.Id!=null){
     			attList.add(new Attachment(
     			Name='The test attachment',
     			Body=bodyBlob,
     			ParentId= e.id,
     			OwnerId = e.OwnerId));
     			    			
     		}
     		
     	System.assertNotEquals(attList.size(), 0); 
     	
     	   	
     	}
     	
     	if(!attList.isEmpty() && attList.size()>0)
     	{
     		insert attList; 
       	}
     
     	for(Attachment a: attList)
     	{
     		if(!attList.isEmpty())
     		{
     			Id eventIdAtt = a.ParentId;
     			eventAttIds.add(eventIdAtt);				
     			}
     		}
     		
     	List<Event> eventListAttIds = [SELECT Id, OwnerId, Account.Id, has_Attachment__c FROM Event WHERE Id IN: eventAttIds];	
     	
     		for(Event e: eventListAttIds)
     		{
     			if(!eventListAttIds.isEmpty() && eventListAttIds.size()>0)
     			{
     				e.has_Attachment__c = true;
     				ownerIds.add(e.OwnerId);
     				accountIds.add(e.Account.Id);
     				eventId = e.Id;
     				eventToUpdate.add(e);
     				
     				System.assertEquals(e.has_Attachment__c, true); 
     			}
     		}update eventToUpdate;
     		
     
  }	
}

If I run the test class I only get 47% of the test coverage.
I have been trying different things without getting that percentage higher than 47 :( 

So the question is, how can I pass the events to the test class with an attachment if I can't insert the attachments becasue the ParendIt is not present? Anyone knows how to tests this particular scenario?
Thanks.