(This story is for CNBC PRO subscribers solely.)That is the day by day pocket book of Mike Santoli, CNBC’s senior markets commentator, with concepts about tendencies, stocks and market statistics.Testing, testing – one, two, three. The market present process a number of checks. S&P 500 testing final week’s lows, Apple testing its 50-day common, tech on the whole testing pre-August-meltup ranges and the general tape being examined for its skill to face up to the corrections in mega-cap progress.Up to now the broad market is hanging in there, however tenuously. Related sample from the previous couple weeks: The typical stock holding up OK, economically delicate teams displaying robust relative efficiency, even because the big-cap indexes really feel the stress of promoting by buyers over-committed to the expansion winners.