How to test with webservice method

Question

I'm new to development, but Ive spend more than 12 hours trying to figure this out and am tearing my hair out :( I've read callout and webservice testing and dont understand how it works...

So I have this class which I modified from: http://www.valnavjo.com/blog/how-to-create-invoices-using-quote-templates/

and I am not getting the coverage (only 23%) , so please offer any advice on how to proceed forward. Basically, the Webservice method that is called from a custom button on opportunity page to generate an invoice PDF file using quote templates feature.

Below is my test class and areas lacking coverage:

@isTest
public class TestInvoicepdfclass {
  static testMethod void testpdfbutton(){

 Pricebook2 pb = new Pricebook2(Name = 'Standard Price Book 2009', Description = 'Price Book 2009 Products', IsActive = true );
    insert pb;
Product2 prod = new Product2(Name = 'SLA: Bronze', IsActive = true);
    insert prod;

PricebookEntry pbe=new PricebookEntry(unitprice=0.01,Product2Id=prod.Id, Pricebook2Id=Test.getStandardPricebookId(), IsActive= true); 
     insert pbe; 
      Test.startTest();
           // insert opp
        Account acc = new Account (name='Acme');
        insert acc;
        Opportunity opp= new Opportunity (name='Testopp', Accountid=acc.id, CloseDate= date.today(), StageName='Closed Won', Pricebook2id=Test.getStandardPricebookId());
          insert opp; 

OpportunityLineItem oppLine = new OpportunityLineItem( pricebookentryid=pbe.Id,TotalPrice=2000, Quantity = 2,Opportunityid = opp.Id);
insert oppLine;       
        // insert quote
        Quote q= new Quote (Name='Testq', Opportunityid=opp.id, QuotetoInvoice__c= True, REP__C= 'AC', Pricebook2id=Test.getStandardPricebookId());
           insert q;
        //add to list
         List<id> oppids= new List<id> ();
        oppids.add(opp.Id); 

          InvoicepdfWsSample.generateInvoicepdf(oppids);

         } 
}

Answer 1

The issue is not unique to "testing a webservice method" it is an error in your code. You test this webservice method just like any other method and can essentially ignore the webservice keyword for testing purposes.

Not sure why you did not post the error message as it would have been helpful and is the real culprit.

This line

final string invoiceTemplateId = Application_Properties__c.getAll().get('Invoice_Template_ID__c').value__c

Is most likely throwing a Dereference null object error because there are not records for the Application_Properties__c custom setting.

You will need to create the custom setting records in your test. Something like:

Application_Properties__c customSetting = New Application_Properties__c( 
                             Name = 'Invoice_Template_ID__c', 
                             Value__c = '[YOUR VALUE HERE]'
);
Insert customSetting;

Also, I do not believe that your use of the final keyword is appropriate in a class method. Maybe, it is for your case but I do not see a value in it.