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SFTerrSFTerr 

Apex Test Classes: "Attempt to de-reference a null object" error

Hi, I wrote a trigger and a test class, but when testing I get below error: 

System.DmlException: Update failed. First exception on row 0 with id 003M000000Zc1NaIAJ; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, PopulateContactAreaCode: execution of BeforeUpdate
caused by: System.NullPointerException: Attempt to de-reference a null object
Trigger.PopulateContactAreaCode: line 5, column 1: []

Trigger: 
trigger PopulateContactAreaCode on Contact (before insert, before update) {

    for(Contact contact : Trigger.new)
    {
        string AreaCode = CountryRegion__c.getInstance(contact.MailingCountry).Area_Code__c;
        contact.Area_Code__c = AreaCode;
    }
}

test class: 
@isTest
public class PopulateContactAreaCodeTest
{
    static testMethod void attTriggerTest1()
    {
        test.startTest();
        Account acct = new Account(id = '001M000000iLhTL', Name = 'Test Account ', Mailing_Country__c = 'Afghanistan');
        update acct;      
        Contact con = new Contact(id = '003M000000Zc1Na', LastName = 'Test Contact', Account = acct, Email = 'test@test.com', Mailing_Country__c = 'Afghanistan', MailingCountry = 'Afghanistan');
        update con;
        delete con;
        test.stopTest();
    }
}

any idea what I added wrong?

thank you in advance
Best Answer chosen by SFTerr
James LoghryJames Loghry

Because you're running a unit test, it doesn't see any data, and therefore no custom settings exist.  You'll need to insert the custom setting before you insert the Contact record.  Here's an example:
 

static testMethod void attTriggerTest1()
    {
        insert new CountryRegion__c(Name='Afghanistan',Area_Code__c='123');

        test.startTest();
        Account acct = new Account(id = '001M000000iLhTL', Name = 'Test Account ', Mailing_Country__c = 'Afghanistan');
        update acct;     
        Contact con = new Contact(id = '003M000000Zc1Na', LastName = 'Test Contact', Account = acct, Email = 'test@test.com', Mailing_Country__c = 'Afghanistan', MailingCountry = 'Afghanistan');
        update con;
        delete con;
        test.stopTest();
    }

All Answers

James LoghryJames Loghry

Because you're running a unit test, it doesn't see any data, and therefore no custom settings exist.  You'll need to insert the custom setting before you insert the Contact record.  Here's an example:
 

static testMethod void attTriggerTest1()
    {
        insert new CountryRegion__c(Name='Afghanistan',Area_Code__c='123');

        test.startTest();
        Account acct = new Account(id = '001M000000iLhTL', Name = 'Test Account ', Mailing_Country__c = 'Afghanistan');
        update acct;     
        Contact con = new Contact(id = '003M000000Zc1Na', LastName = 'Test Contact', Account = acct, Email = 'test@test.com', Mailing_Country__c = 'Afghanistan', MailingCountry = 'Afghanistan');
        update con;
        delete con;
        test.stopTest();
    }
This was selected as the best answer
SFTerrSFTerr
Thank you so much, I did not think of that
SFTerrSFTerr
Can I also ask you why similar trigger for leads does not recognise the custom setting? 
  
trigger PopulateLeadAreaCode on Lead (before insert, before update) {

    for (Lead newLead : Trigger.new)
    {
        string AreaCode = CountryRegion__c.getInstance(Lead.Country). Area_Code__c;
        lead.Area_Code__c = AreaCode;
    }
}

Error: Compile Error: Variable does not exist: CountryRegion__c at line 5 column 27
mahika agrawalmahika agrawal
Hi @james Loghry,

I have the below trigger and trigger handler could you help me as I am getting two errors: 
1. Attempt to derefrence a nullObject.
2. Assertion Failed.

if(Trigger.isAfter && Trigger.isInsert){ 
               IFB_PayInSlipTriggerHandler.IncreasePISBalanceoncreation(Trigger.New);
    }

Handler Class: 
public static void IncreasePISBalanceoncreation(list<IFB_PayInSlips__c> payInSlips){
        for(IFB_PayInSlips__c ObjPIS: payInSlips){
             //check the status if it is PIScreated 
           IFB_CashVaultService.MaintainVaultBalance(ObjPIS.IFB_Status__c , ObjPIS.IFB_TotalAmount__c, ObjPIS.OwnerId);
 }

and have again we have service class which is calling MaintainVaultBalance.

Let me know if any further details are required.

Thanks in advance.