Can't access wrapper list in test method

Question

I have a helper class that has a wrapper class in it. I use the wrapper to return two lists in a method.

Example:

public static revenueWrapper createRevenue(List<Project_Submission__c> projSubList, Map<String, Period> periodMap)
{
    revenueWrapper rev = new revenueWrapper();

    for(Project_Submission__c ps : projSubList)
    {
            Revenue_Pipeline__c revPipe = new Revenue_Pipeline__c();
                revPipe.External_Id__c = extCom;
                revPipe.NPD_Forecast_Category__c = 'Commercial Budget';
                revPipe.CurrencyIsoCode = ps.CurrencyIsoCode;
                revPipe.Project_Submission__c = ps.Id;
            rev.revPipe.add(revPipe);

            rev.revPipeSchedule.addAll(createschedule(ps.Id, launch));
    }

    public class revenueWrapper
{
    List<Revenue_Pipeline__c> revPipe = new List<Revenue_Pipeline__c>();
    List<Revenue_Pipeline_Schedule__c> revPipeSchedule = new List<Revenue_Pipeline_Schedule__c>();
}

Now in my test I'm sending info to the method and returning a result:

 @isTest static void testcreateRevenue_B1()
{
    List<Project_Submission__c> ps = [
        SELECT  Id, 
                CurrencyISOCode, 
                Year_1_Commercial_Budget__c
        FROM Project_Submission__c];
    ps[0].Target_Launch_Date__c = System.Date.today();
    ps[0].Year_1_Commercial_Budget__c = 1000;

    List<Period> periodList = NPD_ProjectSubmissionHelper.getfiscalPeriod();
    Map<String, Period> periodMap = NPD_ProjectSubmissionHelper.makeMap(periodList);

    Test.startTest();
        NPD_ProjectSubmissionHelper.revenueWrapper results = new NPD_ProjectSubmissionHelper.revenueWrapper();
        results = NPD_ProjectSubmissionHelper.createRevenue(ps, periodMap);

        System.debug('results are:: ' + results);

        //System.assertEquals(1, results,
        //'The revenue should have been created');
    Test.stopTest();
}

In the dev console in the debug log I can see that the the revPipe list is populated from the wrapper

|DEBUG|results are:: revenueWrapper:[revPipe=(Revenue_Pipeline__c:{External_Id__c=a0Gm00000037U18EAE-CommercialBudget, NPD_Forecast_Category__c=Commercial Budget, CurrencyIsoCode=USD, Project_Submission__c=a0Gm00000037U18EAE})...

My problem is when I try to reference the list I get the error:

Variable is not visible: NPD_ProjectSubmissionHelper.revenueWrapper.revPipe

How can I get to the wrapper list to assert on? Changing the class to @testVisible does nothing

Answer 1

The wrapper class's instance variables have no access specifier, meaning that they get private as the default:

[private] List<Revenue_Pipeline__c> revPipe = ;
[private] List<Revenue_Pipeline_Schedule__c> = ;

It's the instance variables that need the @TestVisible annotation, rather than their enclosing class. That will make them available in test code.