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Yogesh BiyaniYogesh Biyani 

Why is this test failing

Here is the Apex Class 
public class AssignLeadsUsingAssignmentRules
{
    @InvocableMethod
    public static void LeadAssign(List<Id> LeadIds)
    {
            Database.DMLOptions dmo = new Database.DMLOptions();
            dmo.assignmentRuleHeader.useDefaultRule= true;          
            Lead Leads=[select id,OwnerId from lead where lead.id in :LeadIds];
            Leads.setOptions(dmo);
        	system.debug('Before Update Lead Details' + Leads);
         	Database.update(Leads,dmo);
        	Lead Leads2=[select id,OwnerId from lead where lead.id in :LeadIds];
        	system.debug('After Update Lead Details' + Leads2);
   }
}

Here is the test class  
@isTest 
      public class TestAssignLeadsUsingAssignmentRules{
      static testMethod void createnewlead() {
     
   //   Test.startTest();    
      Lead leadToCreate =new Lead();
      List<id> Ids= New List<Id>();
    //  leadToCreate.ownerid= userToCreate.id;
      leadToCreate.ownerid= UserInfo.getUserId();  
      leadToCreate.LastName ='Sample1';
      leadToCreate.Email='Someone@somewhere.com';
      leadToCreate.Company='OneTwo34';
      leadToCreate.LeadSource='Partner Referral';
      leadToCreate.Country='IN';
      leadToCreate.Source_Last_Lead_Source_Detail__c='Form - Contact Form';
          
      insert leadToCreate; 
      
      Ids.add(leadToCreate.id);
      AssignLeadsUsingAssignmentRules.leadAssign(Ids);
      System.assertEquals('00G1W000002RyhMUAS', leadToCreate.OwnerId, 'Something is wrong');

 	//  Test.stopTest();
      
   }
}

The test class fails as shown below User-added imageAs you can see the debug log shows the lead OwnerId has changed but the change does not persist outside the class in the test. What am I missing? 
Best Answer chosen by Yogesh Biyani
AubryAubry
Yogesh, your test class must re-query the lead to get the new owner Id, after calling the "leadAssign" method on line 20. 
@isTest 
      public class TestAssignLeadsUsingAssignmentRules{
      static testMethod void createnewlead() {
     
   //   Test.startTest();    
      Lead leadToCreate =new Lead();
      List<id> Ids= New List<Id>();
    //  leadToCreate.ownerid= userToCreate.id;
      leadToCreate.ownerid= UserInfo.getUserId();  
      leadToCreate.LastName ='Sample1';
      leadToCreate.Email='Someone@somewhere.com';
      leadToCreate.Company='OneTwo34';
      leadToCreate.LeadSource='Partner Referral';
      leadToCreate.Country='IN';
      leadToCreate.Source_Last_Lead_Source_Detail__c='Form - Contact Form';
          
      insert leadToCreate; 
      
      Ids.add(leadToCreate.id);
      AssignLeadsUsingAssignmentRules.leadAssign(Ids);
      Lead createdLead = [SELECT OwnerId FROM Lead WHERE Id = :leadToCreate.Id];
      System.assertEquals('00G1W000002RyhMUAS', createdLead.OwnerId, 'Something is wrong');

 	//  Test.stopTest();
      
   }
}

this code should work

All Answers

system.logssystem.logs
System.assertEquals('00G1W000002RyhMUAS', leadToCreate.OwnerId, 'Something is wrong'); --> 1st Expected and 2nd Actual should be equal else it will give fatal error. Here 1st parameter is groupId and second is Userid (Line 17 ownerId). As both are not equal so throwing an error. Hope this helps!
AubryAubry
Yogesh, your test class must re-query the lead to get the new owner Id, after calling the "leadAssign" method on line 20. 
@isTest 
      public class TestAssignLeadsUsingAssignmentRules{
      static testMethod void createnewlead() {
     
   //   Test.startTest();    
      Lead leadToCreate =new Lead();
      List<id> Ids= New List<Id>();
    //  leadToCreate.ownerid= userToCreate.id;
      leadToCreate.ownerid= UserInfo.getUserId();  
      leadToCreate.LastName ='Sample1';
      leadToCreate.Email='Someone@somewhere.com';
      leadToCreate.Company='OneTwo34';
      leadToCreate.LeadSource='Partner Referral';
      leadToCreate.Country='IN';
      leadToCreate.Source_Last_Lead_Source_Detail__c='Form - Contact Form';
          
      insert leadToCreate; 
      
      Ids.add(leadToCreate.id);
      AssignLeadsUsingAssignmentRules.leadAssign(Ids);
      Lead createdLead = [SELECT OwnerId FROM Lead WHERE Id = :leadToCreate.Id];
      System.assertEquals('00G1W000002RyhMUAS', createdLead.OwnerId, 'Something is wrong');

 	//  Test.stopTest();
      
   }
}

this code should work
This was selected as the best answer
Yogesh BiyaniYogesh Biyani
@Aubry, Re-query gives the correct result.