Test Class help for my apex code

I have to write test class for this apex code:

public static void CreaEventoCorrispondente() {

if (trigger.isInsert) {

Map<Integer, Event> EventstoUpsert1 = new Map<Integer, Event> ();
Map<Integer, Event> EventstoUpsert2 = new Map<Integer, Event> ();
List<Schema.PicklistEntry> ple = Edizione__c.Lead_Tutor__c.getDescribe().getPicklistValues();
List<String> cognomiTutor = new List<String> ();
for (Schema.PicklistEntry p : ple) {
cognomiTutor.add(p.getLabel());
}
Map<String, Id> CognomiIds = new Map<String, Id> ();
for (User u :[SELECT Id, LastName FROM User WHERE LastName IN :cognomiTutor]) {
CognomiIds.put(u.LastName, u.Id);
}

integer pos = 0;


for (Edizione__c e : (List<Edizione__c>) trigger.new) {

if (e.Lead_Tutor__c != NULL && CognomiIds.keySet().contains(e.Lead_Tutor__c)) {
Event newEvent1 = new Event(isAllDayEvent = TRUE, Location=e.Sede__c, Subject = e.Name, StartDateTime = (DateTime.newInstance(e.Data_inizio__c , (DateTime.newInstance(e.Data_inizio__c, Time.newInstance(0,0,0,0))).timeGMT())), EndDateTime = (DateTime.newInstance(e.Data_fine__c, (DateTime.newInstance(e.Data_fine__c, Time.newInstance(0,0,0,0))).timeGMT())), OwnerId = CognomiIds.get(e.Lead_Tutor__c));
EventstoUpsert1.put(pos, newEvent1);
}
if (e.Lead_Tutor__c != NULL && CognomiIds.keySet().contains(e.Second_Tutor__c)) {
Event newEvent2 = new Event(isAllDayEvent = TRUE, Location=e.Sede__c, Subject = e.Name, StartDateTime = (DateTime.newInstance(e.Data_inizio__c, (DateTime.newInstance(e.Data_inizio__c, Time.newInstance(0,0,0,0))).timeGMT())), EndDateTime = (DateTime.newInstance(e.Data_fine__c, (DateTime.newInstance(e.Data_fine__c, Time.newInstance(0,0,0,0))).timeGMT())), OwnerId = CognomiIds.get(e.Second_Tutor__c));
EventstoUpsert2.put(pos, newEvent2);
}
pos++;
}
if (!EventstoUpsert1.isEmpty()) {
insert EventstoUpsert1.values();
for (Integer i : EventstoUpsert1.keySet()) {
Edizione__c ed = ((Edizione__c) trigger.new[i]);
ed.IdEventoLeadTutor__c = EventstoUpsert1.get(i).Id;
}

}
if (!EventstoUpsert2.isEmpty()) {
insert EventstoUpsert2.values();
for (Integer i : EventstoUpsert2.keySet()) {
Edizione__c ed = ((Edizione__c) trigger.new[i]);
ed.IdEventoSecondTutor__c = EventstoUpsert2.get(i).Id;
}

}

} else if (trigger.isUpdate) {

Map<Id, Event> EventstoUpsert1 = new Map<Id, Event> ();
Map<Id, Event> EventstoUpsert2 = new Map<Id, Event> ();
List<Schema.PicklistEntry> ple = Edizione__c.Lead_Tutor__c.getDescribe().getPicklistValues();
List<String> cognomiTutor = new List<String> ();
List<Id> EventstoDelete = new List<Id>();
for (Schema.PicklistEntry p : ple) {
cognomiTutor.add(p.getLabel());
}
Map<String, Id> CognomiIds = new Map<String, Id> ();
for (User u :[SELECT Id, LastName FROM User WHERE LastName IN :cognomiTutor]) {
CognomiIds.put(u.LastName, u.Id);
}

for (Edizione__c e : (List<Edizione__c>) trigger.new) {
if (e.Lead_Tutor__c != ((Edizione__c) trigger.oldMap.get(e.Id)).Lead_Tutor__c) {
if (((Edizione__c) trigger.oldMap.get(e.Id)).Lead_Tutor__c == NULL){
Event ev = new Event();
ev = new Event(isAllDayEvent = TRUE, Subject = e.Name, Location=e.Sede__c, StartDateTime = (DateTime.newInstance(e.Data_inizio__c, (DateTime.newInstance(e.Data_inizio__c, Time.newInstance(0,0,0,0))).timeGMT())), EndDateTime = (DateTime.newInstance(e.Data_fine__c, (DateTime.newInstance(e.Data_fine__c, Time.newInstance(0,0,0,0))).timeGMT())), OwnerId = CognomiIds.get(e.Lead_Tutor__c));
EventstoUpsert1.put(e.Id, ev);
} else if (e.Lead_tutor__c == NULL) {
EventstoDelete.add(e.IdEventoLeadTutor__c);
e.IdEventoLeadTutor__c = NULL;
} else {
if (((Edizione__c) trigger.oldMap.get(e.Id)).IdEventoLeadTutor__c != NULL) {
EventstoUpsert1.put(e.Id, new Event(Id = ((Edizione__c) trigger.oldMap.get(e.Id)).IdEventoLeadTutor__c, OwnerId = CognomiIds.get(e.Lead_Tutor__c)));
}
}
}
if (e.Second_Tutor__c != ((Edizione__c) trigger.oldMap.get(e.Id)).Second_Tutor__c) {
if (((Edizione__c) trigger.oldMap.get(e.Id)).Second_Tutor__c == NULL){
Event ev = new Event();
ev = new Event(isAllDayEvent = TRUE, Subject = e.Name, Location=e.Sede__c, StartDateTime = (DateTime.newInstance(e.Data_inizio__c, (DateTime.newInstance(e.Data_inizio__c, Time.newInstance(0,0,0,0))).timeGMT())), EndDateTime = (DateTime.newInstance(e.Data_fine__c, (DateTime.newInstance(e.Data_fine__c, Time.newInstance(0,0,0,0))).timeGMT())), OwnerId = CognomiIds.get(e.Second_Tutor__c));
EventstoUpsert2.put(e.Id, ev);
} else if (e.Second_tutor__c == NULL) {
EventstoDelete.add(e.IdEventoSecondTutor__c);
e.IdEventoSecondTutor__c = NULL;
} else {
if (((Edizione__c) trigger.oldMap.get(e.Id)).IdEventoSecondTutor__c != NULL) {
EventstoUpsert2.put(e.Id, new Event(Id = ((Edizione__c) trigger.oldMap.get(e.Id)).IdEventoSecondTutor__c, OwnerId = CognomiIds.get(e.Second_Tutor__c)));
}
}
}
}

if (!EventstoUpsert1.isEmpty()) {
upsert EventstoUpsert1.values();
for (Id i : EventstoUpsert1.keySet()) {
Edizione__c ed = ((Edizione__c) trigger.newMap.get(i));
ed.IdEventoSecondTutor__c = EventstoUpsert1.get(i).Id;
}
}
if (!EventstoUpsert2.isEmpty()) {
upsert EventstoUpsert2.values();
for (Id i : EventstoUpsert2.keySet()) {
Edizione__c ed = ((Edizione__c) trigger.newMap.get(i));
ed.IdEventoSecondTutor__c = EventstoUpsert2.get(i).Id;
}
}
if (!EventstoDelete.isEmpty()){
List<Event> ETDL = new List<Event>();
for (Id i : EventstoDelete){
ETDL.add(new Event(Id = i));
}
delete ETDL;
}

}

}

This class retrive an apex trigger :

trigger Trigger_Edizione on Edizione__c (before update, before insert, after update, before delete) {
if (trigger.isBefore){
       if (!trigger.isDelete){
           EdizioneHelper.CreaEventoCorrispondente();
       } else {
           EdizioneHelper.CancellaEventoCorrispondente();
       }
   }

The test class that I have writed is :

static testMethod void TestCreaEventoCorrispondente() {

Map<Integer, Event> Events1 = new Map<Integer, Event> ();
Map<Integer, Event> Events2 = new Map<Integer, Event> ();
List <Schema.PicklistEntry> l_picklist = new List <Schema.PicklistEntry>();
List <Id>l_Ids= new List <Id>();
Map<String,Id> S_Ids = new Map <String,Id> ();

List <Edizione__c> l_ed= new List <Edizione__c>();
Edizione__c edizione = new Edizione__c(Data_inizio__c=date.valueof('2016-09-07'),Data_fine__c=date.valueof('2016-09-07'),motivo_stato__c='edizione confermata', Codice_piattaforma__c='edizione',Sede__c='Milano',Name='ciccio',Data_Invio_al_Sito__c=date.valueof('2016-09-15'),Lead_Tutor__c='Colonna');
insert edizione;
l_ed.add(edizione);

List <Event> l_ev = new List <Event>();
Event ev = new Event (Location=edizione.Sede__c,Subject=edizione.name, IsAllDayEvent=false, StartDateTime = datetime.newInstance(2014, 11, 13, 16, 30, 0), EndDateTime = datetime.newInstance(2014, 11, 13, 18, 30, 0));
l_ev.add(ev);
insert ev;


User us = new User (Username='d.pippo@bridgepartners.it.dev',LastName='Pugliese',FirstName='Domenico', Email='d.pugliese@bridgepartners.it', Alias='dpugl', CommunityNickname='d.pippo', TimeZoneSidKey='Europe/Rome', LocaleSidKey='it_IT', EmailEncodingKey='ISO-8859-1', ProfileId='00e58000000ZU0WAAW', LanguageLocaleKey='it');
insert us;
update us;

EdizioneHelper.CreaEventoCorrispondente();

update ev;
EdizioneHelper.CreaEventoCorrispondente();

delete ev;
EdizioneHelper.CreaEventoCorrispondente();

delete l_ev;
EdizioneHelper.CreaEventoCorrispondente();

ev.IsAllDayEvent=true;
update ev;
EdizioneHelper.CreaEventoCorrispondente();

edizione.Second_Tutor__c='Fioretti';
update edizione;
EdizioneHelper.CreaEventoCorrispondente();

}

The result of run test is :

System.NullPointerException: Attempt to de-reference a null object, when I write in the test class
EdizioneHelper.CreaEventoCorrispondente();
and when I write   if (trigger.isInsert) in the apex class

October 26, 2016
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Answer
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Moggy
you can not call the EdizoneHelper.CreaEventoCorrispondente() directly in your test class
As you have references to a trigger this is defineltely a trigger handler class, therefore your test code should simply create a situation
that this responsible trigger is fired,

take out the direct calls "EdizoneHelper.CreaEventoCorrispondente()" and see what happens
create for each "event" its own test method ( Insert ; update ; delete ) including the test data creation

October 27, 2016
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