Hi - I have the following visualforce page with controller that allows for multiple row entry on a custom object. I'm stuck on how to get coverage for the Pagereference add() method.  How do I get test data added to the visualforce page so that I can test it? the data is a list passed from the controller..

Thanks in advance!

Visualforce Page based on custom object Term__C which is the child of the Contract object in a master-detail relationship.

<apex:page controller="multiAddVC" sidebar="false" id="VCPage" showheader="true" tabstyle="contract">
<script language="JavaScript" type="text/javascript">
function CloseAndRefresh(){
window.parent.location.href="/{!$CurrentPage.parameters.id}"; self.close(); }
</script>
<apex:pageMessages />
<apex:form >
<apex:pageBlock title="Virtual Contract - Financial Terms">
<apex:pageBlockButtons >
<apex:pagemessages rendered="true" id="msg2" />
<apex:commandButton value="Add New" action="{!add}" rerender="rows" status="outStatus"/>
<apex:commandButton value="Clear Unsaved" action="{!reset}" rerender="rows" status="outStatus" immediate="true" />
<apex:commandButton action="{!save}" value="Save and Close" oncomplete="javascript&colon;CloseAndRefresh()" rerender="rows,msg2" status="outStatus"/>
</apex:pageBlockButtons>
<apex:pageBlockTable width="100%" align="center" value="{!cexs}" var="c" id="rows" >
<apex:column headervalue="REF">
    <apex:outputText value="{!c.Name}"/>
</apex:column>
<apex:column headerValue="Category">
    <apex:inputField value="{!c.MainCategory__c}" required="true"/>
    </apex:column>
<apex:column headervalue="Sub">
    <apex:inputField value="{!c.Category__c}" required="true"/>
</apex:column>
<apex:column headervalue="Reference">
    <apex:inputField value="{!c.Contract_Reference__c}" required="true"/>
</apex:column>
<apex:column headervalue="Financial Term">
    <apex:inputField value="{!c.Financial_Term__c}" required="true"/>
</apex:column>
<apex:column headervalue="Other Info">
    <apex:inputField value="{!c.Short_Description__c}" style="width: 300px;height:50px"/>
</apex:column>
<apex:column headervalue="Frequency">
    <apex:inputField value="{!c.Frequency__c}" required="true"/>
</apex:column>
<apex:column headervalue="Approved?">
    <apex:outputText value="{!c.Approved__c}"/>
</apex:column>
<apex:column headervalue="Active?">
    <apex:outputText value="{!c.Active_Term__c}"/>
</apex:column>

</apex:pageBlockTable>
</apex:pageblock>
</apex:form>
</apex:page>

Controller

public class multiAddVC {
List <Term__c> VCList;
public Id cID = ApexPages.currentPage().getParameters().get('Id'); //grab the Contract ID
public Id getID {get; set;}

public PageReference reset(){ 
VCList = [select name, Contract__c, Category__c,maincategory__c, contract_reference__c,short_description__c,frequency__c,
financial_term__c,active_term__c,approved__c from Term__c where Contract__c =: cID order by createddate ];
return null; 
}
        public List <term__c> getCExs(){
        if(VCList == null) reset();
    Return VCList;
        }        
public void setAccounts(List <Term__c> cexs) {
   VCList = cexs;}
public PageReference save() {//upsert records on save
upsert VCList;
ApexPages.Message myMsg = new ApexPages.message(ApexPages.Severity.Info, 'Records Saved Successfully'); //show confirmation message on save
ApexPages.addMessage(myMsg);
return null;}
public PageReference add() {
VCList.add(New Term__c(Contract__c = cID)); //add records to Virtual contract and associate with current Contract
return null; }
}

Unit Test 

@isTest
public class MultiAddVCTests {
static testmethod void MultiAddVCControllerTests(){

// create a new account

account testaccount = new Account(Name='TEST COMPANY',Region__c='EMEA');
insert testaccount;

account testaccount2 = new Account(Name='EMEA REGION',Industry='System use only',Market__c='HQ', Type='Other', Group__c='Global Network Partnerships',Region__c='EMEA');
insert testaccount2;

// create an LFO contact
Contact lfo = new Contact(LastName = 'Hello LFO',business_unit__c='Regional LFO team',accountid=testaccount2.id,email='test2@test.com');

      insert lfo;

// create a BDL contact
Contact bdl = new Contact(LastName = 'Hello BDL',business_unit__c='GNS Business',accountid=testaccount2.id,email='test2@test.com');

      insert bdl;

// Add a new contract

contract c = new Contract();{
//c.status='Not Started';
c.bdl_contact__c=bdl.id;
c.lfo_contact__c=lfo.id;
c.accountid=testaccount.id;
c.companysigneddate=system.today();
c.customersigneddate=system.today();
c.date_rec_d_in_gdi_inbox__c=system.today();
c.startdate=system.today();
c.Project_plan_approved__c=true;
c.name='Test Contract';
c.agreement_type__c='Other';
c.mfr_required__c=false;
c.BETA_test_required__c=false;


insert c;
}

system.assert(true);

// set-up a Virtual contract record

term__c VC = new Term__c(contract__c=c.id,short_description__c='test short',contract_reference__c='test contract ref',approved__c=false,
    contract_language__c='Test contract language',frequency__c='Other',active_term__c='Yes');

insert vc;


// Set up visualforce parameters

PageReference pageRef = Page.MultiAddVC;
PageRef.getParameters().put('id',c.id);

Test.setCurrentPage(pageRef);


MultiAddVC controller = new MultiAddVC();

// create an instance of the controller
// Get a list of Terms already in the system and make sure they are displayed on Page
    
List<Term__c> Terms = ([select name, Contract__c, Category__c,maincategory__c, 
contract_reference__c,short_description__c,frequency__c,financial_term__c,active_term__c,
approved__c from Term__c where Contract__c =:c.id]); 

List<Term__c> VFTerms = controller.getCEXs();

system.assertEquals(Terms,VFTerms);
    
controller.save(); 
controller.add();    
    
 }
}