consume private age variable for mock test

Author: mazunki

test/unit/fs/vfs_test.cpp

@@ -27,6 +27,7 @@ class Person {
 public:
   explicit Person(std::string name, int age) : name_ {name}, age_ {age} {};
   bool isBjarne() const { return (name_ == "Bjarne") ? true : false; }
+  bool isAdult() const { return (age_ >= 18) ? true : false; }
 private:
   std::string name_;
   int age_;
@@ -75,7 +76,9 @@ CASE("VFS entries can contain arbitrary objects")
   EXPECT(info == "Person");
   Person bjarne = e.obj<Person>();
   EXPECT(bjarne.isBjarne() == true);
+  EXPECT(bjarne.isAdult() == true);
   EXPECT_THROWS(e.obj<std::string>());
+
   // constness is checked
   const Person q {"Dennis", 70};
   fs::VFS_entry f(q, "inspiration", "duh^2");