my class ------>

public without sharing class AllBeatMaps {
   
    public list<Beat_Map__c> bmapList {get;set;}
    public list<User> salesRepList {get;set;}
    public String pageTitle {get;set;}
    public String querytype {get;set;}
   
    public AllBeatMaps(){
     pageTitle='SELECT BEAT MAP';
     String salesRep = 'Sales Rep';
     querytype = apexpages.currentPage().getParameters().get('type');
     String query1 = 'SELECT Id,Name,Beat_Definition__c FROM Beat_Map__c';
     String query2 = 'SELECT Id,Name,Userrole.Name FROM User WHERE UserRole.Name=';
     
     if(querytype!=null && querytype.trim().length()>0){
      if(querytype=='beatmap'){
       bmapList = Database.query(query1);
      }
      if(querytype=='salesrep'){
       pageTitle = 'SELECT SALES REP';
       query2+='\''+salesRep+'\'';
       salesRepList=Database.query(query2); 
      }
     }
    }
   
}

Test Class ---------->

@isTest
public class AllBeatMapsTest {
    public static testmethod void allbeatmptest(){
        profile SalesRep = [Select Id FROM Profile Where Name= 'Sales Representative'];
        userRole urp = new UserRole(Name = 'Sales Rep');
        insert urp;
        User ur = new User(UserRoleid=urp.Id,ProfileId = SalesRep.Id,Alias = 'hfsre',Country='India',Email='defo1@urturiurain.com',EmailEncodingKey='UTF-8', LastName='oiuriuterh', LanguageLocaleKey='en_US',LocaleSidKey='en_US',TimeZoneSidKey='America/Los_Angeles', UserName='wdjhfgb@b.com');
        insert ur;
 
        system.runAs(ur){
        list<User> usa = new list<User>();
        usa.add(ur);
           
            Beat_Map__c bm = new Beat_Map__c();
            bm.Beat_Definition__c = 'Gurugram Sector 14,17,21,23';
            insert bm;
            list<Beat_Map__c> bmc = new list<Beat_Map__c>();
            bmc.add(bm);
  PageReference pageRef = Page.AllBeatMaps;
  Beat_Map__c bcc = new Beat_Map__c();
  bcc.Beat_Definition__c = 'Gurugram Sector 45,17,21,23';
  insert bcc;
  
   Test.setCurrentPage(pageRef);
   pageRef.getParameters().put('id',bcc.id);
           
            AllBeatMaps obh = new AllBeatMaps();
           
 }
}
           
          
         
           
        }