Method ContainsMatcher

unittests/catch.hpp:2569–2569

        struct ContainsMatcher : MatcherBase<std::vector<T>> {

            ContainsMatcher(std::vector<T> const &comparator) : m_comparator( comparator ) {}

            bool match(std::vector<T> const &v) const override {
                // !TBD: see note in EqualsMatcher