HI
i am new to salesforce

i am getting only 50% code coverage only
please write the test class for this controller class

Here my code:
public class Partner_For_Account {
    public list<Partner_For_Account__c>partners{set;get;}
    public string partnerAccountid{set;get;}
    private final Account acct;
    public integer rowno{set;get;}
    public list<Partner_For_Account__c> PartnerAccount { get; set; }
    public id Accountid;
     //string id= Apexpages.currentPage().getparameters().get('id');
    public Partner_For_Account(Apexpages.standardcontroller controller){
        Accountid=controller.getid();
         System.debug('Accountid'+Accountid);
        system.debug('partnerAccountid'+partnerAccountid);
        partners=new list<Partner_For_Account__c>();
       PartnerAccount = new list<Partner_For_Account__c>();
        Partner_For_Account__c p=new Partner_For_Account__c();
        p.Account__c=Accountid;
       
      partners.add(p);
        system.debug('partners'+partners);
       
        system.debug('Name'+'Malli');
        
         PartnerAccount =[select id,Partner__c,Partner_Manager__c,Partner_Segment__c,Partner_Sales_Person__c ,Account__c from Partner_For_Account__c where Account__c =:Accountid];
        
    }
    public void addrow(){
        partners.add(new Partner_For_Account__c(Account__c=Accountid));
    }
     public void deleterow(){
        rowno=integer.valueOf(apexpages.currentPage().getparameters().get('index'));
        partners.remove(rowno);
    }
    public void savepartner(){
        insert partners;
        partners=new list<Partner_For_Account__c>();
         Partner_For_Account__c p=new Partner_For_Account__c();
        p.Account__c=Accountid;
       
      partners.add(p);
      refreshing();
    }
    public void deletepartnerAccount()
    {
        system.debug('partnerAccountid'+partnerAccountid);
        Partner_For_Account__c PartnerAccounts=[select Partner__c,Partner_Manager__c,Partner_Segment__c,Partner_Sales_Person__c ,Account__c from Partner_For_Account__c  where id=:partnerAccountid];
        delete PartnerAccounts;
 refreshing();
    }
    
    public void refreshing(){
          PartnerAccount =[select Partner__c,Partner_Manager__c,Partner_Segment__c,Partner_Sales_Person__c ,Account__c from Partner_For_Account__c where Account__c =:Accountid];
    }
}