Hi All,
I am getting 0% coverage in 3 classes,OrderExtension,OrderTrigger,OrderHelper.
My Tests are all passing but getting NullPointer Exception in below code line highlighted.I dont know where I am doing mistake.
How do I correct this Error?
Please help!!!!
Thanks in Advance.

Product2Tests 
-----------------------------------------------------------
@isTest (seeAllData=false)
private class Product2Tests {
    
    /**
* @name product2Extension_UnitTest
* @description UnitTest for product2Extension
**/
    static TestMethod void Product2Extension_UnitTest(){
        
        PageReference pageRef = page.Product2New;
        Product2 prod = new Product2(Name='test', isActive= true);
        ApexPages.StandardController controller = new ApexPages.StandardController(prod);
        Test.startTest();
        Product2Extension ext = new Product2Extension(controller);
        System.assertEquals(Constants.DEFAULT_ROWS, ext.productsToInsert.size());
        ext.addRows();
        System.assertEquals(2*Constants.DEFAULT_ROWS, ext.productsToInsert.size());
        
        for(Integer i=0; i< Constants.DEFAULT_ROWS; i++) {
            
            Product2 newProduct = new Product2(Name='Product'+i, Initial_Inventory__c = 10, isActive=true, family= Constants.PRODUCT_FAMILY.get(math.mod(i,4)).getValue());
            ext.productsToInsert.get(i).productRecord = newProduct;
            
            PriceBookEntry entry = new PriceBookEntry(UnitPrice = 100, isActive=true);
            ext.productsToInsert.get(i).pricebookEntryRecord = entry;
            
        }
        ext.save();
        ext.GetFamilyOptions();
        ext.GetInventory();
        List<Product2> selectedProd = [Select id from Product2];
        System.assertEquals(Constants.DEFAULT_ROWS, selectedProd.size());
        Test.stopTest();
    }
    
    static TestMethod void Product2Trigger_UnitTest() {
        try{
        Test.startTest();
        Product2 newProduct = new Product2();
        newProduct.Name = 'Test';
        newProduct.Family = 'Dessert';
        newProduct.IsActive = true;
        newProduct.Quantity_Ordered__c = 5;
        newProduct.Initial_Inventory__c = 10;
        insert newProduct;
        
        CollaborationGroup c = new CollaborationGroup();
        c.Name = 'TEST' + Constants.INVENTORY_ANNOUNCEMENTS;
        c.Description = 'Description';
        c.CollaborationType = 'Public';
        insert c;
        
        newProduct.Quantity_Ordered__c=96;
        update newProduct;
        Test.stopTest();
        }catch(Exception e){
            System.debug('Exception has occurred '+e);
        }
    } 
    
}