I keep getting the following error while running my Apex Test Class. If I could please get assistance in resolving the problem I would appreciate it. I continue getting the following error:

System.DmlException: Insert failed. First exception on row 0; first error: STRING_TOO_LONG, Alias: data value too large: Sminull90 (max length=8): [Alias]

Below is my code:

Apex Class:

public  class NewUtilStaffProcess {
       @future
       public static void createUtlUser(Id recid) {
            
           Contact gcon = [SELECT Email, Lastname, Firstname, Middlename, AcctId
                            FROM   Contact
                            WHERE  Id = :recid];
           
           Profile p = [SELECT Id FROM Profile WHERE Name='HAVNA City Public Utility Group'];
           
           Id acctsTypeId = [SELECT Id
                            FROM   RecordType
                            WHERE  SObjectType = 'Account'
                            AND    Name = 'Account Source'].Id;
           
           String groleId = [SELECT Id FROM UserRole WHERE Name = 'Utility Staff' LIMIT 1].Id;
           
           
           String formatUsrName;
           String setUsrLoc;
           
           Account retAcct = [SELECT Id, HAVNA_Country__r.HAVNA_Letter_Code__c, Hav_Locality__c, Hav_Street__c
                               FROM   Account
                               WHERE  Id = :gcon.AcctId
                               AND    recordTypeId = :acctsTypeId
                               LIMIT 1];
           
           if (retAcct.Hav_Street__c == 'Local/Surveyor')
              setUsrLoc = retAcct.HAVNA_Country__r.HAVNA_Letter_Code__c+retAcct.Hav_Locality__c;
        
           if (retAcct.Hav_Street__c == 'City/Surveyor')
              setUsrLoc = retAcct.HAVNA_Country__r.HAVNA_Letter_Code__c+'C1';
         
           if (retAcct.Hav_Street__c == 'State/Surveyor')
              setUsrLoc = retAcct.HAVNA_Country__r.HAVNA_Letter_Code__c+'C2';
        
             
           if (gcon.middlename == null) {
               formatUsrName = gcon.Lastname.deleteWhitespace().toLowercase().trim()+'.'+gcon.Firstname.deleteWhitespace().toLowercase().trim()+'.cnastaff'+setUsrLoc+'@HAVNA.gmail';
           } else {
               Integer midSize = gcon.Middlename.length();
               if (midSize == 1) {
                   formatUsrName = gcon.Lastname.deleteWhitespace().toLowercase().trim()+'.'+gcon.Firstname.deleteWhitespace().toLowercase().trim()+'.'+gcon.middlename.deleteWhitespace().toLowercase().trim()+'.cnastaff'+setUsrLoc+'@HAVNA.gmail';
               } else {
                   formatUsrName = gcon.Lastname.deleteWhitespace().toLowercase().trim()+'.'+gcon.Firstname.deleteWhitespace().toLowercase().trim()+'.'+gcon.middlename.deleteWhitespace().trim().substring(0,1).toLowercase()+'.cnastaff'+setUsrLoc+'@HAVNA.gmail';
               }    
           }

           System.debug('Formatted Username: '+formatUsrName);
      
           User u       = new User(Alias    = gcon.Lastname.deleteWhitespace().trim().length() > 4 ? gcon.Lastname.deleteWhitespace().trim().substring(0,3)+setUsrLoc: gcon.lastname+setUsrLoc,
                         Email              = gcon.Email,
                         EmailEncodingKey   = 'UTF-8',
                         LastName           = gcon.Lastname,
                         FirstName          = gcon.Firstname,
                         MiddleName         = gcon.Middlename,         
                         LanguageLocaleKey  = 'en_US',
                         LocaleSidKey       = 'en_US',
                         ProfileId          = p.Id,
                         UserRoleId         = groleid,          
                         TimeZoneSidKey     = 'America/New_York',
                         UserName           = formatUsrName);
          
           Insert(u);
           System.debug(u.id);
           
           UtilStaffPermSet.assgnPermissionSet(recId, u.Id);  
           System.resetPassword(u.Id, True);

      }
}

Apex Test Class:

@isTest
public class NewUtilStaffProcessTest {

   public static testMethod void InitialTest() {

        /* Get Record Id Type */   
        Id conTypeId;
        Id acctTypeId;
        String formatUsrName;
        String setUsrLoc;
        
        conTypeId = [SELECT Id  
                     FROM   RecordType
                     WHERE  SObjectType = 'Contact'
                     AND    Name = 'Utility Staffer'].Id;  

       
        Id acctsTypeId = [SELECT Id
                      FROM   RecordType
                      WHERE  SObjectType = 'Account'
                          AND    Name = 'Account Source'].Id;

        Profile p = [SELECT Id FROM Profile WHERE Name='HAVNA City Public Utility Group'];
        String groleId = [SELECT Id FROM UserRole WHERE Name = 'Utility Staff' LIMIT 1].Id;

        Integer midsize;
       
        //Create new State record; initialize required field(s), then insert
        HAV_State_and_Country__c state  = new HAV_State_and_Country__c();
        state.Name                = 'Oregon';
        state.HAV_Letter_Code__c = 'OR';
        state.HAV_Type__c        = 'State';
        Insert state;
        
        //Create new Account record; initialize required field(s), then insert
        Account acct = new Account(Name='Oregon Local 7');
        acct.Hav_Locality__c     = '90';
        acct.Hav_Street__c     = 'Local/Surveyor';
        acct.RecordTypeId     =  AcctTypeId;
        acct.HAV__Country__c    = state.id;
    insert acct;

        //Create new Contact record; initialize required field(s), then insert
        Contact con  = new Contact();   
        con.FirstName       = 'Ralph';  
        con.LastName        = 'Smith';
        con.Middlename      = 'Otis';
        con.RecordTypeId    =  conTypeId;
        con.email           = 'rsmith8@verizon.com';
        con.AcctId          = acct.id;
          
        //Insert Contact
        Insert con ;
       
          System.debug(con.id);
 
       Account retAcct = [SELECT Id, HAV_Country__r.HAV_Letter_Code__c, Hav_Locality__c, Hav_Street__c
                          FROM   Account
                          WHERE  Id           = :con.AcctId
                          AND    recordTypeId = :nomsTypeId
                          LIMIT 1];
                          
       if (retAcct.Hav_Street__c == 'Local/Surveyor')
              setUsrLoc = retAcct.HAV_Country__r.HAV_Letter_Code__c+retAcct.Hav_Locality__c;
 
       if (con.middlename == null) {
           System.debug('3: '+setUsrLoc);
               formatUsrName = con.Lastname.deleteWhitespace().toLowercase().trim()+'.'+con.Firstname.deleteWhitespace().toLowercase().trim()+'.cnastaff'+setUsrLoc+'@HAVNA.gmail';
           } else {
               System.debug('4: '+setUsrLoc);
               midSize = con.Middlename.length();
               if (midSize == 1) {
                   System.debug('5: '+setUsrLoc);
                   formatUsrName = con.Lastname.deleteWhitespace().toLowercase().trim()+'.'+con.Firstname.deleteWhitespace().toLowercase().trim()+'.'+con.middlename.deleteWhitespace().toLowercase().trim()+'.cnastaff'+setUsrLoc+'@HAVNA.gmail';
               } else {
                   System.debug('6: '+setUsrLoc);
                   formatUsrName = con.Lastname.deleteWhitespace().toLowercase().trim()+'.'+con.Firstname.deleteWhitespace().toLowercase().trim()+'.'+con.middlename.deleteWhitespace().trim().substring(0,1).toLowercase()+'.cnastaff'+setUsrLoc+'@HAVNA.gmail';
               }    
           }
           
 User thisUser = [SELECT Id FROM User WHERE Id = :UserInfo.getUserId()];
 system.runAs(thisUser){
         User u       = new User(Alias      = con.LastName.deleteWhitespace().trim().length() > 4 ? con.LastName.deleteWhitespace().trim().substring(0,4)+setUsrLoc: con.LastName+setUsrLoc,
                         Email              = con.email,
                         EmailEncodingKey   = 'UTF-8',
                         LastName           = con.LastName,
                         FirstName          = con.Firstname,
                         MiddleName         = con.Middlename,         
                         LanguageLocaleKey  = 'en_US',
                         LocaleSidKey       = 'en_US',
                         ProfileId          = p.Id,
                         UserRoleId         = groleid,          
                         TimeZoneSidKey     = 'America/New_York',
                         UserName           = formatUsrName);
          
           Insert(u);
           System.debug(u.id);  

                        
        Test.startTest();
       
        NewUtilStaffProcess.createUtlUser(con.id);
 
        Test.stopTest();
        system.debug('Done');
    }
     }
}

Thanks.