update all testCase functions' 'Testing:' labels to match the Test Plan Checklist
replace all 'const_reference' instance with 'const T&'
update const T& operator[](size_type pos) const to be fully checked in test case 15 not 4
There is a strange 2 line checklist item that seems unused
// [20] template <class Args...>
//        iterator emplace(const_iterator pos, Args...);