This is my apex Class
public class employeeDateSearch {
 
    @AuraEnabled
    public static List<Employee_Payroll__c> getEmployeeData(string monthYear){
        List<Employee_Payroll__c> returnList = new List<Employee_Payroll__c>();
        Set<Id> empIds = new Set<Id>();
     List<Employee_Payroll__c> empl = [SELECT Id, Name__c, Attendence__c,Employee_Name__c, Allowances__c, Holidays__c, Advance__c, Visa__c, Iqama__c, Insurance__c, Ticket__c, Others__c, Start_Date__c, End_Date__c, Ot__c, Sick_Leave__c, Basic_Salary__c FROM Employee_Payroll__c WHERE Month_and_year__c=:monthYear];
        if(empl.size() >0){
         
            for(Employee_Payroll__c epl : empl){
                
                empIds.add(epl.Name__c);
                returnList.add(epl);
            }
        }
        
        List<Employee__c> empList;
        AggregateResult[] atteList;
        AggregateResult[] LeaveList;
        if(empIds.size() >0){
            empList = [SELECT Id,Name,Basic_Salary__c,Employee_ID__c FROM Employee__c WHERE Not (Id IN :empIds)];
            atteList  = [SELECT Count(Id)cnt,Employee__c FROM Attendance__c WHERE Month_and_year__c=:monthYear AND (NOT (Employee__c IN : empIds))  GROUP BY Employee__c];
            LeaveList  = [SELECT SUM(No_of_Days__c)noL,Employee__c FROM Leave__c WHERE Month_and_year__c=:monthYear AND (NOT (Employee__c IN : empIds)) AND (Approval_Status__c ='Accept' OR Approval_Status__c ='Edit & Accept')  GROUP BY Employee__c];
        }else{
            empList = [SELECT Id,Name,Basic_Salary__c,Employee_ID__c FROM Employee__c];
            atteList  = [SELECT Count(Id)cnt,Employee__c FROM Attendance__c WHERE Month_and_year__c=:monthYear GROUP BY Employee__c];
             LeaveList  = [SELECT SUM(No_of_Days__c)noL,Employee__c FROM Leave__c WHERE Month_and_year__c=:monthYear AND (Approval_Status__c ='Accept' OR Approval_Status__c ='Edit & Accept')  GROUP BY Employee__c];
        }
       
            for(Employee__c est : empList){
                Employee_Payroll__c epll = new Employee_Payroll__c();
                epll.Name__c = est.Id;
                epll.Basic_Salary__c = est.Basic_Salary__c;
                epll.Employee_Name__c = est.Name;
                for(AggregateResult agat : atteList){
                    if((id)agat.get('Employee__c') == est.Id){
                        epll.Attendence__c = (decimal)agat.get('cnt');
                    }
                }
                 for(AggregateResult agls : LeaveList){
                    if((id)agls.get('Employee__c') == est.Id){
                        epll.Sick_Leave__c = (decimal)agls.get('noL');
                    }
                }
                returnList.add(epll);
                
            }
        
        return returnList;
        
    }
    @AuraEnabled
    public static List<Employee_Payroll__c> savePayroll( List<Employee_Payroll__c> emplList, string monthName, string yearName){
        List<Employee_Payroll__c> updateList = new List<Employee_Payroll__c>();
        for(Employee_Payroll__c empl : emplList){
            Employee_Payroll__c epl = new Employee_Payroll__c();
            if(empl.Id !=null ){
                epl.Id = empl.Id;
            }
            epl.Month__c = monthName;
            epl.Year__c = yearName;
            epl.Name__c = empl.Name__c;
            epl.Basic_Salary__c = empl.Basic_Salary__c;
            epl.Ot__c = empl.Ot__c;
            epl.Attendence__c = empl.Attendence__c;
            epl.Sick_Leave__c = empl.Sick_Leave__c;
            epl.Advance__c = empl.Advance__c;
            epl.Visa__c = empl.Visa__c;
            epl.Iqama__c = empl.Iqama__c;
            epl.Insurance__c = empl.Insurance__c;
             epl.Ticket__c = empl.Ticket__c;
            updateList.add(epl);
        }
        upsert updateList;
        
        return updateList;
    }

This is my Test Class::

@isTest
public class employeeDateSearchTest {
    public static testMethod void getEmployeeDataTest(){
        Test.startTest();
        Set<Id> empIds = new Set<Id>();
        List<Employee_Payroll__c> UpPayroll = new List<Employee_Payroll__c>();
        Employee_Payroll__c empPayroll = new Employee_Payroll__c();
        empPayroll.Name__c = 'a0h1s000001uiHZAAY';        
        empPayroll.Basic_Salary__c = 2000;
        empPayroll.Ot__c = 2;
        empPayroll.Attendence__c = 23;
        empPayroll.Sick_Leave__c = 2;
        empPayroll.Advance__c = 200;
        empPayroll.Visa__c = 250;
        empPayroll.Iqama__c = 300;
        empPayroll.Insurance__c = 100;
        empPayroll.Ticket__c = 200;
        empPayroll.Holidays__c =4;
        empPayroll.Allowances__c=400;
        empPayroll.Others__c= 200;
        empIds.add(empPayroll.Name__c);
        //empPayroll.Month_and_year__c='' ;
        UpPayroll.add(empPayroll);
        insert UpPayroll;              
        employeeDateSearch.getEmployeeData('system.today');
        test.stopTest();
    }
    
    
    public static testMethod void  SavePayrollTest(){  
        test.startTest();
        List<Employee_Payroll__c> updList = new List<Employee_Payroll__c>();
        Employee_Payroll__c emproll = new Employee_Payroll__c();  
        // emproll.id = empList.id;
        // emproll.Month__c = 'November';
        // emproll.Year__c = '2021';
        emproll.Name__c = 'a0h1s000001uiHZAAY';
        emproll.Basic_Salary__c = 2000;
        emproll.Ot__c = 2;
        emproll.Attendence__c = 23;
        emproll.Sick_Leave__c = 2;
        emproll.Advance__c = 200;
        emproll.Visa__c = 250;
        emproll.Iqama__c = 300;
        emproll.Insurance__c = 100;
        emproll.Ticket__c = 200;       
        updList.add(emproll);  
        upsert updList; 
        
        employeeDateSearch.savePayroll( updList, 'November', '2021');
        test.stopTest();
    }   
    
}

With this Test class i have coverd 60% and I am a Begginer Can any one help me with the Test Class.