The N.B.A. has not yet said how it would handle an outbreak on campus as the season resumes, but the bubble appears to be holding. The league announced that of the 346 players tested daily for the coronavirus from July 13 to 19, none tested positive for the virus. A few notable players have left, but the departures have been attributed to urgent personal matters or injuries. “From my standpoint, it’s going very well, and I’m cautiously optimistic that we’re on the right track,” said Silver, the commissioner, who is scheduled to make his first appearance on campus this week. “But I also recognize what we’re doing has not been done before, and the competition is just beginning. The real test will come when players are commingling, playing basketball without masks and without physical distancing.”