Create a test method to a class - Force.com - testing

Question

Can anyone help me to create a test method for the following class. The basic idea of this code is to clone a patent with all child elements and just change the date.
public class NovoDia {
//added an instance varaible for the standard controller
private ApexPages.StandardController controller {get; set;}
// add the instance for the variables being passed by id on the url
private Itinerario_Diario__c po {get;set;}
private Itinerario_Diario__c pi {get;set;}
// set the id of the record that is created -- ONLY USED BY THE TEST CLASS
public ID newRecordId {get;set;}
// initialize the controller
public NovoDia(ApexPages.StandardController controller) {
//initialize the stanrdard controller
this.controller = controller;
// load the current record
po = (Itinerario_Diario__c)controller.getRecord();
}
// method called from the VF's action attribute to clone the po
public PageReference cloneWithItems() {
// setup the save point for rollback
Savepoint sp = Database.setSavepoint();
Itinerario_Diario__c newPO;
try {
//copy the purchase order - ONLY INCLUDE THE FIELDS YOU WANT TO CLONE
po = [select Dia__c from Itinerario_Diario__c where id = :po.id];
newPO = po.clone(false);
insert newPO;
// set the id of the new po created for testing
newRecordId = newPO.id;
// copy over the line items - ONLY INCLUDE THE FIELDS YOU WANT TO CLONE
List<Viagem__c> items = new List<Viagem__c>();
//PI.Dia__c = PO.Dia__c;
for (Viagem__c pi : [Select Cliente__c,Inicio_planejado__c,Entrada_Sa_da_de_Turno__c,Meio_de_Solicitacao__c,Motorista__c,Rota__c,Tipo_de_Viagem__c,Turno__c,Veiculo__c From Viagem__c p where Itinerario_Diario__c = :po.id ]) {
Viagem__c newPI = pi.clone(false);
newPI.Itinerario_Diario__c = newPO.id;
//newPI.Dia__c = PO.Dia__c;
items.add(newPI);
}
insert items;
} catch (Exception e){
// roll everything back in case of error
Database.rollback(sp);
ApexPages.addMessages(e);
return null;
}
return new PageReference('/'+newPO.id+'/e?retURL=%2F'+newPO.id);
}
I really appreciate the help.
Thanks
Sylvio

Answer 1

static testmethod void NovoDia_Test(){
Itinerario_Diario__c itinerarioDiario= new Itinerario_Diario__c();
insert itinerarioDiario;
ApexPages.StandardController sc = new ApexPages.StandardController(itinerarioDiario);
NovoDia cttr = new NovoDia (sc);
cttr.cloneWithItems();
}