I have an apex class that works how I want it in the sandbox. Trying to move it to production and need to write a test class. Used an example provided but I continue to get errors when running test that the lead was already converted. Need Help!
@isTest 
public class TestAutoConvertLeads{
    static testMethod void createnewlead() {
      User userToCreate = [Select id from user where profile.name='System Administrator' Limit 1];
      Test.startTest();    
      Lead leadToCreate =new Lead();
      List<id> Ids= New List<Id>();
      leadToCreate.ownerid= userToCreate.id;
      leadToCreate.LastName ='Gupta';
      leadToCreate.LeadSource='Partner Referral';
      leadToCreate.Rating='';
      leadToCreate.Status='';
      insert leadToCreate; 
      Ids.add(leadToCreate.id);
      AutoConvertLeads.LeadAssign(Ids);
      Test.stopTest();
   }
}
Also adding original apex class: