Method GetFrame

tests/ReaderBase.cpp:35–35

		TestReader() { };
		CacheBase* GetCache() { return nullptr; };
		std::shared_ptr<Frame> GetFrame(int64_t number) { std::shared_ptr<Frame> f(new Frame()); return f; }
		void Close() { };
		void Open() { };
		std::string Json() const { return ""; };