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shakila Gshakila G 

How to write a Apex Trigger test class for lead object

Hi, I wrote a trigger to prevent the lead duplicates based on the mobile number and Email.

Am wondering to write a test class for the same trigger. My test class was not passed .can anyone give me the suggestion to how to write a flow for the test class.

My Trigger  code

Trigger leaddup17 on lead(before insert, After Update) {


    Set<String> setEmail = new Set<String>();
    Set<String> setnumber = new Set<String>();
    Set<String> setId = new Set<String>();
    
    for (Lead ld: Trigger.new) {
        if (ld.Phone != Null ||  ld.MobilePhone!=Null || ld.Whatsapp_Mobile__c!=Null || ld.Mobile_Additional__c!=Null|| ld.Phone_Additional__c!=Null 
            ){
                    
            setnumber.add(ld.MobilePhone);
            setnumber .add(ld.Whatsapp_Mobile__c);
            setnumber .add(ld.Mobile_Additional__c);
            setnumber .add(ld.Phone);
            setnumber .add(ld.Phone_Additional__c);
           
          }
        
        if (ld.Email!=null || ld.E_Mail_Additional__c!=Null){
            setEmail.add(ld.Email);
             setEmail.add(ld.Email);
             setEmail.add(ld.E_Mail_Additional__c);
            
        }
        setId.add(ld.id);
    }
        
    List<Lead> lstExistingLead = [Select id,Phone,Email,E_Mail_Additional__c,MobilePhone,Whatsapp_Mobile__c,Phone_Additional__c,Mobile_Additional__c from Lead where  ((email in :setEmail or E_Mail_Additional__c in : setEmail ) or
     (Phone in :setnumber or Phone_Additional__c in : setnumber  or Mobile_Additional__c in : setnumber   or Whatsapp_Mobile__c in :setnumber   or
     MobilePhone in : setnumber))    and (id not in :setId)];
    
    map < string, Lead > LeadsMap = new map < String, Lead > ();
   

    for (Lead ld: lstExistingLead) {
        if (ld.Email!=null || ld.E_Mail_Additional__c!=Null || ld.Phone != Null ||  ld.MobilePhone!=Null || ld.Whatsapp_Mobile__c!=Null || ld.Mobile_Additional__c!=Null|| ld.Phone_Additional__c!=Null )
        {
        
            LeadsMap .put(ld.Phone, ld);
             LeadsMap .put(ld.MobilePhone, ld);
              LeadsMap .put(ld.Whatsapp_Mobile__c, ld);
               LeadsMap .put(ld.Phone_Additional__c, ld);
                LeadsMap .put(ld.Mobile_Additional__c, ld);
                LeadsMap .put(ld.Email, ld);
             LeadsMap .put(ld.E_Mail_Additional__c, ld);
                 
        }   
          setId.add(ld.id);
    }

    for (Lead ld: Trigger.new) 
    {
    
    
        if ( Trigger.isInsert &&  ld.Email!=null || ld.E_Mail_Additional__c!=Null &&  ld.Phone == Null ||  ld.MobilePhone==Null || ld.Whatsapp_Mobile__c==Null || ld.Mobile_Additional__c==Null|| ld.Phone_Additional__c==Null 
        
        && ld.Email != trigger.oldMap.get(ld.Id).Email  ||
         ld.E_Mail_Additional__c!= trigger.oldMap.get(ld.Id).E_Mail_Additional__c)
         
        {
            if ((ld.Email != null && LeadsMap .get(ld.Email) != null) || (ld.E_Mail_Additional__c!= null && LeadsMap .get(ld.E_Mail_Additional__c) != null) )
             {
                ld.adderror('Lead already exist with this  Email. You cannot create a duplicate leads.');
            }
        }

        if ( Trigger.isInsert || (ld.Phone != trigger.oldMap.get(ld.Id).Phone) ||
        (ld.MobilePhone!= trigger.oldMap.get(ld.Id).MobilePhone)||
        (ld.Whatsapp_Mobile__c!= trigger.oldMap.get(ld.Id).Whatsapp_Mobile__c)||
        (ld.Mobile_Additional__c!= trigger.oldMap.get(ld.Id).Mobile_Additional__c)||
        (ld.Phone_Additional__c!= trigger.oldMap.get(ld.Id).Phone_Additional__c))
        {
            if ((ld.Phone != null && LeadsMap.get(ld.Phone) != null) ||
           ( ld.MobilePhone!= null && LeadsMap.get(ld.MobilePhone) != null)||
            (ld.Whatsapp_Mobile__c!= null && LeadsMap.get(ld.Whatsapp_Mobile__c) != null)||
            (ld.Mobile_Additional__c!= null && LeadsMap.get(ld.Mobile_Additional__c) != null)||
            (ld.Phone_Additional__c!= null && LeadsMap.get(ld.Phone_Additional__c) != null)) {
                ld.adderror('Lead already exist with this Phone Number . You cannot create a duplicate leads.');
            }
            setId.add(ld.id);
        }
        
        
        
         if ( (Trigger.isupdate  && (ld.Email!=Null || ld.E_Mail_Additional__c!=Null)) && ((ld.Email != trigger.oldMap.get(ld.Id).Email ) ||
        (ld.E_Mail_Additional__c!= trigger.oldMap.get(ld.Id).E_Mail_Additional__c)))
         
        {
            if ((ld.Email != null && LeadsMap .get(ld.Email) != null) || (ld.E_Mail_Additional__c!= null && LeadsMap .get(ld.E_Mail_Additional__c) != null) )
             {
                ld.adderror('Lead already exist with this  Email. You cannot create a duplicate leads.');
            }
        }

        if ((Trigger.isupdate && (ld.Phone!=Null ||ld.MobilePhone!=Null ||ld.Whatsapp_Mobile__c!=Null || ld.Mobile_Additional__c!=Null ||
     ld.Phone_Additional__c!=Null)) &&  ((ld.Phone != trigger.oldMap.get(ld.Id).Phone) ||
        (ld.MobilePhone!= trigger.oldMap.get(ld.Id).MobilePhone)||
        (ld.Whatsapp_Mobile__c!= trigger.oldMap.get(ld.Id).Whatsapp_Mobile__c)||
        (ld.Mobile_Additional__c!= trigger.oldMap.get(ld.Id).Mobile_Additional__c)||
        (ld.Phone_Additional__c!= trigger.oldMap.get(ld.Id).Phone_Additional__c)))
        {
            if ((ld.Phone != null && LeadsMap.get(ld.Phone) != null) ||
           ( ld.MobilePhone!= null && LeadsMap.get(ld.MobilePhone) != null)||
            (ld.Whatsapp_Mobile__c!= null && LeadsMap.get(ld.Whatsapp_Mobile__c) != null)||
            (ld.Mobile_Additional__c!= null && LeadsMap.get(ld.Mobile_Additional__c) != null)||
            (ld.Phone_Additional__c!= null && LeadsMap.get(ld.Phone_Additional__c) != null)) {
                ld.adderror('Lead already exist with this Phone Number . You cannot create a duplicate leads.');
            }
            
            setId.add(ld.id);
        }
        
    }
    
}
 
Best Answer chosen by shakila G
Om PrakashOm Prakash
Hi Shakila,
Bellow test class will give you sufficent code coverage.
Note -  adderror is used in your trigger so Database.insert is used in test methods to avoid failure of test methods.
(You might be need to add your custom fields if required for test case)
@isTest
public class TestLeadTrigger
{
    @isTest
    public static void testLeadInsert ()
    {
        Lead objLead = new Lead (LastName = 'Test', Email = 'test@gmail.com', mobilephone = '+1234567890', Company = 'Test company');
        insert objLead; 
		
		Test.startTest();
	    objLead = new Lead (LastName = 'Test data', Email = 'test@gmail.com', mobilephone = '+1234567890', Company = 'Test company');
		Database.SaveResult result = Database.insert(objLead, false);
		System.assert(result.getErrors()[0].getMessage().contains('Lead already exist with this'));
		Test.stopTest();
    }
	
    @isTest
    public static void testLeadUpdate ()
    {
        Lead objLead = new Lead (LastName = 'Test', Email = 'test@gmail.com', mobilephone = '+1234567890', Company = 'Test company');
        insert objLead; 
	    Lead objSecondLead = new Lead (LastName = 'Test data', Email = 'testother@gmail.com', mobilephone = '+1234567800', Company = 'Test company');
        insert objSecondLead; 

		Test.startTest();
		objSecondLead.Email = objLead.Email;
		objSecondLead.mobilephone = objLead.mobilephone;
		Database.SaveResult result = Database.update(objSecondLead, false);
		System.assert(result.getErrors()[0].getMessage().contains('Lead already exist with this'));
		Test.stopTest();
    }
}

Trailhead for Test Class:
https://trailhead.salesforce.com/en/modules/apex_testing/units/apex_testing_intro
 

All Answers

SFDC RohitSFDC Rohit
Here is the link for "How to write a test class for an apex trigger"
https://developer.salesforce.com/forums/?id=906F00000008xzaIAA

Thanks,
Rohit Jain
Om PrakashOm Prakash
Hi Shakila,
Bellow test class will give you sufficent code coverage.
Note -  adderror is used in your trigger so Database.insert is used in test methods to avoid failure of test methods.
(You might be need to add your custom fields if required for test case)
@isTest
public class TestLeadTrigger
{
    @isTest
    public static void testLeadInsert ()
    {
        Lead objLead = new Lead (LastName = 'Test', Email = 'test@gmail.com', mobilephone = '+1234567890', Company = 'Test company');
        insert objLead; 
		
		Test.startTest();
	    objLead = new Lead (LastName = 'Test data', Email = 'test@gmail.com', mobilephone = '+1234567890', Company = 'Test company');
		Database.SaveResult result = Database.insert(objLead, false);
		System.assert(result.getErrors()[0].getMessage().contains('Lead already exist with this'));
		Test.stopTest();
    }
	
    @isTest
    public static void testLeadUpdate ()
    {
        Lead objLead = new Lead (LastName = 'Test', Email = 'test@gmail.com', mobilephone = '+1234567890', Company = 'Test company');
        insert objLead; 
	    Lead objSecondLead = new Lead (LastName = 'Test data', Email = 'testother@gmail.com', mobilephone = '+1234567800', Company = 'Test company');
        insert objSecondLead; 

		Test.startTest();
		objSecondLead.Email = objLead.Email;
		objSecondLead.mobilephone = objLead.mobilephone;
		Database.SaveResult result = Database.update(objSecondLead, false);
		System.assert(result.getErrors()[0].getMessage().contains('Lead already exist with this'));
		Test.stopTest();
    }
}

Trailhead for Test Class:
https://trailhead.salesforce.com/en/modules/apex_testing/units/apex_testing_intro
 
This was selected as the best answer
shakila Gshakila G
Thanks for the Code. While Execting the below test class am getting a below error Error Message System.NullPointerException: Attempt to de-reference a null object Stack Trace Class.leadDupePreventerTests.testLeadDupPreventer: line 40, column 1 Test Class : @isTest public class leadDupePreventerTests{ static testMethod void testLeadDupPreventer() { Set testEmailAddress = new Set(); Set testmobile= new Set(); testEmailAddress.add('test1@duptest.com'); testEmailAddress.add('test2@duptest.com'); testmobile.add('9597559008'); testmobile.add('9710056846'); testmobile.add('8220119661'); testmobile.add('9566667366'); testmobile.add('9677987468'); System.assert([SELECT count() FROM Lead WHERE ((Email IN :testEmailAddress or E_Mail_Additional__c in : testEmailAddress) or (MobilePhone in:testmobile or Whatsapp_Mobile__c in : testmobile or Mobile_Additional__c in :testmobile or Phone in :testmobile or Phone_Additional__c in :testmobile))]>=0); lead lead1 = new Lead(LastName='Test1Dup',E_Mail_Additional__c=' test4@duptest.com', Email='test1@duptest.com',LeadSource='Click India', MobilePhone='9597559008',Whatsapp_Mobile__c='971005684' ,Mobile_Additional__c='8220119661' ,Phone='9566667366', Phone_Additional__c='9677987468', Status='Open',Customer_Type__c='Shop',Company='Test',Date__c= Date.newInstance(2018, 03, 23)); insert lead1 ; Lead dup1 = new Lead(LastName='Test1Dup',E_Mail_Additional__c=' test4@duptest.com', Email='test1@duptest.com',LeadSource='Click India', MobilePhone='9597559008',Whatsapp_Mobile__c='9710056846' ,Mobile_Additional__c='8220119661' ,Phone='9566667366', Phone_Additional__c='9677987468', Status='Open',Customer_Type__c='Shop',Company='Test',Date__c= Date.newInstance(2018, 03, 23)); try { insert dup1; } catch (DmlException e) { System.assert(e.getNumDml() == 1); System.assert(e.getDmlIndex(0) == 0); System.assert(e.getDmlFields(0).size() > 1); System.assert(e.getDmlFields(0)[0].getDescribe().getName() == 'Email'); System.assert(e.getDmlFields(0)[0].getDescribe().getName() == 'E_Mail_Additional__c'); System.assert( e.getDmlFields(0)[0].getDescribe().getName() == 'MobilePhone'); System.assert(e.getDmlFields(0)[0].getDescribe().getName() == 'Mobile_Additional__c'); System.assert( e.getDmlFields(0)[0].getDescribe().getName() == 'Phone'); System.assert( e.getDmlFields(0)[0].getDescribe().getName() == 'Phone_Additional__c'); System.assert(e.getDmlFields(0)[0].getDescribe().getName() == 'Whatsapp_Mobile__c'); System.assert(e.getDmlMessage(0).indexOf( 'A lead with this email/mobile address already exists.') > -1); } dup1 = new Lead(Id = lead1.Id, LastName='Test1Dup',E_Mail_Additional__c='test4@duptest.com', Email=' test1@duptest.com',LeadSource='Click India', MobilePhone='9597559008',Whatsapp_Mobile__c='9710056846' ,Mobile_Additional__c='8220119661' ,Phone='9566667366', Phone_Additional__c='9677987468', Status='Open',Customer_Type__c='Shop',Company='Test',Date__c= Date.newInstance(2018, 03, 23)); try { update dup1; //System.assert(false); } catch (DmlException e) { System.assert(e.getNumDml() == 1); System.assert(e.getDmlIndex(0) == 0); System.assert(e.getDmlFields(0).size() >1); System.assert(e.getDmlFields(0)[0].getDescribe().getName() == 'Email'); System.assert(e.getDmlFields(0)[0].getDescribe().getName() == 'E_Mail_Additional__c'); System.assert( e.getDmlFields(0)[0].getDescribe().getName() == 'MobilePhone'); System.assert(e.getDmlFields(0)[0].getDescribe().getName() == 'Mobile_Additional__c'); System.assert( e.getDmlFields(0)[0].getDescribe().getName() == 'Phone'); System.assert( e.getDmlFields(0)[0].getDescribe().getName() == 'Phone_Additional__c'); System.assert(e.getDmlFields(0)[0].getDescribe().getName() == 'Whatsapp_Mobile__c'); System.assert(e.getDmlMessage(0).indexOf( 'A lead with this email address already exists.') > -1); } } }
Om PrakashOm Prakash
Hi, I just reviewed your trigger and found oldMap is used with Trigger.isInsert . Please remove oldMap logic check with Trigger.insert because during insert oldMap return null. Have a look Trigger.isInsert || (ld.Phone != trigger.oldMap.get(
shakila Gshakila G
First, I got the same error null point exception while executing the Trigger without test class. 

Now Trigger is working fine. only in my the test class is getting an error.

still, I have to do the changes in the trigger itself, not in test class?
Om PrakashOm Prakash
Can you please put your test class in code block during reply. I am unable to review due to text formatting of your test code in above reply.
shakila Gshakila G
Thanks Prakash. I have done some changes in my test class. Now it's working fine..Thanks for the time you spent on my queries.
Amit Chaudhary 8Amit Chaudhary 8
I will recommend you to start using trailhead to learn about test classes
1) https://trailhead.salesforce.com/modules/apex_testing

Also please check below post
1) https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_qs_test.htm
2) https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_testing_example.htm

sample Test classes
1) http://amitsalesforce.blogspot.com/2015/06/best-practice-for-test-classes-sample.html

Sample test class for you
Om Prakash Test class should work for you. If you still getting error plz share your test class and trigger again


Please follow below salesforce Best Practice for Test Classes :-

1. Test class must start with @isTest annotation if class class version is more than 25
2. Test environment support @testVisible , @testSetUp as well
3. Unit test is to test particular piece of code working properly or not .
4. Unit test method takes no argument ,commit no data to database ,send no email ,flagged with testMethod keyword .
5. To deploy to production at-least 75% code coverage is required
6. System.debug statement are not counted as a part of apex code limit.
7. Test method and test classes are not counted as a part of code limit
9. We should not focus on the  percentage of code coverage ,we should make sure that every use case should covered including positive, negative,bulk and single record .
Single Action -To verify that the the single record produces the correct an expected result .
Bulk action -Any apex record trigger ,class or extension must be invoked for 1-200 records .
Positive behavior : Test every expected behavior occurs through every expected permutation , i,e user filled out every correctly data and not go past the limit .
Negative Testcase :-Not to add future date , Not to specify negative amount.
Restricted User :-Test whether a user with restricted access used in your code .
10. Test class should be annotated with @isTest .
11 . @isTest annotation with test method  is equivalent to testMethod keyword .
12. Test method should static and no void return type .
13. Test class and method default access is private ,no matter to add access specifier .
14. classes with @isTest annotation can't be a interface or enum .
15. Test method code can't be invoked by non test request .
16. Stating with salesforce API 28.0 test method can not reside inside non test classes .
17. @Testvisible annotation to make visible private methods inside test classes.
18. Test method can not be used to test web-service call out . Please use call out mock .
19. You can't  send email from test method.
20.User, profile, organization, AsyncApexjob, Corntrigger, RecordType, ApexClass, ApexComponent ,ApexPage we can access without (seeAllData=true) .
21. SeeAllData=true will not work for API 23 version eailer .
22. Accessing static resource test records in test class e,g List<Account> accList=Test.loadData(Account,SobjectType,'ResourceName').
23. Create TestFactory class with @isTest annotation to exclude from organization code size limit .
24. @testSetup to create test records once in a method  and use in every test method in the test class .
25. We can run unit test by using Salesforce Standard UI,Force.com IDE ,Console ,API.
26. Maximum number of test classes run per 24 hour of period is  not grater of 500 or 10 multiplication of test classes of your organization.
27. As apex runs in system mode so the permission and record sharing are not taken into account . So we need to use system.runAs to enforce record sharing .
28. System.runAs will not enforce user permission or field level permission .
29. Every test to runAs count against the total number of DML issued in the process .

Let us know if this will help you
 
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