1Z0-809 Web TestEngine demo

Implement Predicate in the Product.ProductFilter class and replace line n2 with .filter (p ->
p.ProductFilter.test (p))

Replace line n1 with:
public static boolean isAvailable (Product p) {

Replace line n2 with:
.filter (p -> p.ProductFilter: :isAvailable (p))

Replace line n2 with:
.filter (p -> Product: :ProductFilter: :isAvailable ())