Looking for help writing an apex code test class

And then your test class would be like:

@istest
public class ContactSumTriggerTest {
    @testsetup
    static void setup(){
      Account a1=new account();
		a1.Name='Test Account 1';
		insert a1;
        Account a2=new account();
		a2.Name='Test Account 2';
		insert a2;
		Contact c=new contact();
		c.AccountId=a1.Id;
		c.LastName='Test Contact';
        insert c;
    }
    public static testmethod void Updatefn(){
        Account a=[select id,name from account where name='Test Account 2'];
        contact c=[select id, name, accountID from contact where lastname='Test Contact' limit 1];
		c.LastName='Test Contact Updated';
		c.AccountId=a.Id;        
        test.startTest();
        try{
            update c;
        }catch(System.Exception e){
        	system.debug(e.getMessage());
    	}
        test.stopTest();
    }
    public static testmethod void Deletefn(){
        contact c=[select id, name, accountID from contact where lastname='Test Contact' limit 1];
        test.startTest();
        try{
            delete c;
        }catch(System.Exception e){
        	system.debug(e.getMessage());
    	}
        test.stopTest();
    }
}