CASE(
    MONTH(TODAY()),

    1, "Q1",
    2, "Q1",
    3, "Q1",

    4, "Q2",
    5, "Q2",
    6, "Q2",

    7, "Q3",
    8, "Q3",
    9, "Q3",

    "Q4"
)

trigger approvalupadte on Opportunity (before update, before insert)
{
  for(Opportunity opp : Trigger.new){
      if(opp.Status__c=='Approved')
      {
      
      opp.App_year ='YYYY';
      opp.App_date =system.today();
      }
      
     
        
  }

}

<apex:commandButton id="CommandButton1" value="Follow" action="{!followOwner}"/>



public Integer followingCount{get;set;}

//Constructor
public userData (ApexPages.StandardController stdController) {
    UserId = UserInfo.getUserId();
    GetCount();
}

 //Method
 public void GetCount() {

 List<User> following = [SELECT Id, Name,title, SmallPhotoUrl FROM User WHERE Id =:parentsetid AND Id !=:u.id order by name]; 
    followingCount = following.size();
 }

public without sharing class CountCon {
    Integer count = 0;
    public Account a {get;set;}        
    
    public CountCon()
    {
        Account a = new Account();
        a = [Select NumberOfEmployees from Account where id = '0019000000DNnwo'];
        if(a.NumberOfEmployees != null)
            count = a.NumberOfEmployees;
    }           
    public PageReference incrementCounter() {
            count++;
            try
            {
                a = [Select id from Account where id = '0019000000DNnwo'];
                a.NumberOfEmployees = count;
                update a;
            }
            catch(exception e)
            {
                ApexPages.addMessages(e);
            }
            return null;
    }
       
                       
    public Integer getCount() {
        return count;
    }
}


Test class



@istest
public class CountCon_test
{ 
 static testmethod void test()
 {
 Account acc= new Account();
 Acc.name='test';
 insert Acc;
 
 CountCon cn = new CountCon ();
 cn.incrementCounter();
 cn.getCount();
 
 }
}

@istest
public class importDataFromCSVController_test
{
 
 static testmethod void test()
 {
 
 importDataFromCSVController mvc = new importDataFromCSVController();
 mvc.importCSVFile();
 mvc.csvAsString='test';
 
 
 }
}


CLASS

public class importDataFromCSVController {
public Blob csvFileBody{get;set;}
public string csvAsString{get;set;}
public String[] csvFileLines{get;set;}
public List<account> acclist{get;set;}
  public importDataFromCSVController(){
    csvFileLines = new String[]{};
    acclist = New List<Account>(); 
  }
  
  public void importCSVFile(){
       try{
           csvAsString = csvFileBody.toString();
           csvFileLines = csvAsString.split('\n'); 
            
           for(Integer i=1;i<csvFileLines.size();i++){
               Account accObj = new Account() ;
               string[] csvRecordData = csvFileLines[i].split(',');
               accObj.name = csvRecordData[0] ;             
               accObj.accountnumber = csvRecordData[1];
               accObj.Type = csvRecordData[2];
               accObj.AccountSource = csvRecordData[3];   
               accObj.Industry = csvRecordData[4];                                                                             
               acclist.add(accObj);   
           }
        //insert acclist;
        }
        catch (Exception e)
        {
            ApexPages.Message errorMessage = new ApexPages.Message(ApexPages.severity.ERROR,'An error has occured while importin data Please make sure input csv file is correct');
            ApexPages.addMessage(errorMessage);
        }  
  }
}


Please see the my screen shot

Apex class :Public class employmenthistiry
{

 public Employee__c emp{get;set;}
 public list<Employee__c > empl{get;set;}
 public List<SelectOption> Technicaloptions{get;set;}
 
 public employmenthistiry()
 {
 
 empl=[select id,name,Date_of_joining__c,Department__c,Desigination__c,Email__c,Employeeid__c,Mobile__c,Office_Phone__c,payslip_lase_sent_date__c,Permanent_cITY__c from Employee__c];
 
  
 }
 
 
 public PageReference submit()
 {
 insert emp;
 return null;
 }
 
}



PAGE

<apex:page controller="employmenthistiry" sidebar="true">
    <apex:form >
        <apex:pageBlock >
            <apex:pageBlockSection title="Employe" collapsible="false">
                    <apex:inputField value="{! emp.Name }"/>
                    <apex:inputField value="{! emp.Date_of_joining__c}"/>
                    <apex:inputField value="{! emp.Department__c}"/>
                    <apex:inputField value="{! emp.Desigination__c}"/>
                    <apex:inputField value="{! emp.Email__c}"/>
                    <apex:inputField value="{! emp.Employeeid__c}"/>
                    <apex:inputField value="{! emp.Mobile__c }"/>
                    <apex:inputField value="{! emp.Office_Phone__c}"/>
                    <apex:inputField value="{! emp.payslip_lase_sent_date__c}"/>
                    <apex:inputField value="{! emp.Technology__c}"/>
                    </apex:pageBlockSection>
                    
             <apex:pageBlockSection TItle="ADDRESS">
             
                    <apex:inputField value="{! emp.Permanent_cITY__c }"/>
                    <apex:inputField value="{! emp.Permanent_State__c}"/>
                    <apex:inputField value="{! emp.PIN_CODE__c}"/>
                    <apex:inputField value="{! emp.Permanent__c}"/>
                    <apex:inputField value="{! emp.Name }"/>
                    <apex:inputField value="{! emp.Village__c}"/>
            </apex:pageBlockSection>   
            
            <apex:commandButton value="submit" action="{!submit}" />  
                
              
        </apex:pageBlock>
  </apex:form>
</apex:page>

public class EmailMessage {

    public String emailTo {get;set;}
    public String emailCc {get;set;}
    public String subject {get;set;}
    public String body {get;set;}
    
    private final Lead lead;

    public PageReference cancel() {
        return null;
    }

     public EmailMessage() {
     list <lead> l= [select Description, ID from Lead where id = :ApexPages.currentPage().getParameters().get('id')];
       subject = lead.Description;
          } 
   
    public void sendEmail() {
        
        //create a mail object to send email 
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        
        //string to hold To Addresses
        if (emailTo != '') {
            String[] toaddress = (new String[]{emailTo});
            //set email properties 
            mail.setSubject(subject);
            mail.setUseSignature(true);
            mail.setPlainTextBody(body); 
            mail.setTargetObjectID(lead.id);
            mail.setToAddresses(toaddress);

         if (emailCc != '') {
            String[] ccaddress = (new String[] {emailCc});
            mail.setCcAddresses(ccaddress);
            }
    
            // send the email
            Messaging.SendEmailResult [] r = Messaging.sendEmail(new Messaging.SingleEmailMessage[] {mail});  
            
            lead.status = 'Email Sent';
            Update lead;
        }           
     }   
 }