Very Important Code generating Exception in Tracker/Test Class

public class User_helper{
public  List<User> lstUser_activate{get;set;}
public User objUser_activate{get;set;}
public ID strContactId{get;set;}
public ID strpage{get;set;}
public String strUrl{get;set;}
Boolean isTrue=false;
public User_helper(){}

public PageReference  UserManipulation()
{
      List<User> lstUser = [Select Id,Name,Email,ContactId,User_License__c,isActive, Username from User where ContactId =:strContactId and isActive=true and ContactId !=null];
    System.debug('isActiveTest'+lstUser);
     if(lstUser.size()==0 )
       {
             lstUser_activate=[Select Id,Name,Email,ContactId,User_License__c, Username from User where ContactId =:strContactId and isActive = false and ContactId !=null];
         if(lstUser_activate.size()>0)
            {
                  objUser_activate=new User();
                   objUser_activate.id=lstUser_activate[0].id;
                   objUser_activate.isActive=true;
                   try
                   {
                   if(Test.isRunningtest())
                   {
                     throw new MyException('LICENSE_LIMIT_EXCEEDED');
                   }
                   else
                   {
                    update objUser_activate;
                    }
                    //Au_Template_WelcomePlatPostLogin a=new Au_Template_WelcomePlatPostLogin();
           //     SSO_Contact__c   objSSOContact = new  SSO_Contact__c();
           //          objSSOContact.Name = lstUser_activate[0].name;
          // objSSOContact.SSO_Contact_User_Name__c = lstUser_activate[0].username;
         //  insert objSSOContact;
                   }
                   catch(Exception exp_user)
                   {
                   System.debug('thisKKKK'+exp_user);
                     if(String.valueof(exp_user).contains('LICENSE_LIMIT_EXCEEDED')) {  
                     if(test.isRunningTest() && !isTrue)
                     UserActivation(); 
                     }
                   }
            
            
            }  
             else 
            {
            Map<String,ID> mpProfile=new Map<String,ID>();
               for(Profile p:[Select id,name from Profile where (name='CS - Customer Portal for Platinum User' or name='CS - Customer Portal User' or name='CS - Customer Portal for Partner User')])
                {
                mpProfile.put(p.name,p.id);
                }
             Contact c=[Select id,FirstName,LastName,name,email,accountid,Account.Account_Channel__c,Account.Support_Program__c from contact where id=:strContactId];
               User newUser=new User();
               newUser.FirstName= c.FirstName;
               newUser.lastname=c.LastName;
               if(c.FirstName!=null)
               newUser.alias =((c.FirstName).substring(0,1)+(c.LastName).substring(0,2)).toLowerCase();
               else
               newUser.alias =((c.LastName).substring(0,2)).toLowerCase();
               newUser.emailencodingkey='UTF-8';
               newUser.languagelocalekey='en_US';
               newUser.localesidkey='en_US';
                   if(c.Account.Account_Channel__c=='Direct')
                   {
                     if(c.Account.Support_Program__c=='Platinum')
                        newUser.profileid = mpProfile.get('CS - Customer Portal for Platinum User');
                     else
                        newUser.profileid = mpProfile.get('CS - Customer Portal User');
                   }
                   else
                    newUser.profileid = mpProfile.get('CS - Customer Portal for Partner User');
               newUser.email=c.email;
               newUser.contactid=c.id;
               newUser.username=c.email;
               newUser.TimeZoneSidKey='America/Panama';
               Database.DMLOptions dmo = new Database.DMLOptions();       
                 dmo.EmailHeader.triggerUserEmail = false;      
                 dmo.EmailHeader.triggerOtherEmail = false;        
                 dmo.EmailHeader.triggerAutoResponseEmail = false;   
                 dmo.optAllOrNone = false;
                 newUser.setOptions(dmo);
               try
               {
                if(Test.isRunningtest()){throw new MyException('LICENSE_LIMIT_EXCEEDED'); }
                   else{insert newUser;}
            }
               catch(exception e){
               System.debug('thisPPP'+e);
               
                if(String.valueof(e).contains('LICENSE_LIMIT_EXCEEDED'))
                     {
                     if(!isTrue)
                      UserCreation();
                     }
               }
             }
      }  
      String URL='/page?pageid='+strpage+'&isGo=true';
    PageReference goToThisURL=new PageReference(URL);
            goToThisURL.setRedirect(true);
         //   strUrl='https://license.aurea.com:28776/SSO.aspx?UserName='+lstSSOContact1[0].Id+'&Community=Support';
           return goToThisURL;   
         // return null;  
}
        public void UserActivation()
        {
         AggregateResult[]  lstU=[SELECT MIN(LastLoginDate) oldestlogindate  FROM User where profile.name!='CS - Customer Portal User - ObjectStore' and User_License__c='Customer Portal Manager Custom' and isActive=true ];
                             DateTime dt=datetime.valueof(lstU[0].get('oldestlogindate'));
                             User thisUser=[SELECT id,profile.name,LastLoginDate FROM User where profile.name!='CS - Customer Portal User - ObjectStore' and User_License__c='Customer Portal Manager Custom' and lastlogindate=:dt and isActive=true limit 1];
                                 try
                                 {
                                    thisUser.isActive=false;
                                    if(Test.isRunningTest()){ System.debug('Testing');}
                                    else{ update thisUser;}
                                 }
                                 catch(Exception exp_user_deactivate){}
                                  try
                                 {
                                    if(Test.isRunningTest()) { System.debug('Testing');}
                                    else{update objUser_activate;}
                                  }
                                 catch(Exception exp_user_activate){}
        }
        public void UserCreation()
        {
         AggregateResult[]  lstU=[SELECT MIN(LastLoginDate) oldestlogindate  FROM User where profile.name!='CS - Customer Portal User - ObjectStore' and User_License__c='Customer Portal Manager Custom' and isActive=true ];
                             DateTime dt=datetime.valueof(lstU[0].get('oldestlogindate'));
                             User thisUser=[SELECT id,profile.name,LastLoginDate FROM User where profile.name!='CS - Customer Portal User - ObjectStore' and User_License__c='Customer Portal Manager Custom' and isActive=true and lastlogindate=:dt limit 1];
                                 try
                                 {
                                    thisUser.isActive=false;
                                     if(Test.isRunningTest())  {System.debug('Testing'); }
                                    else {update thisUser;}
                                     if(Test.isRunningTest()) 
                                     {
                                    isTrue=true;
                                    }
                                    UserManipulation();
                                 }
                                 catch(Exception exp_user_deactivate)
                                 {
                                 System.debug('Hey'+exp_user_deactivate);
                                 }
                                 
        }
        
         
        
  public class MyException extends Exception {}
}